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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Nov. 18, 2017	Dec. 15, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Nov. 18, 2017
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Trading Symbol	AZO
Entity Registrant Name	AUTOZONE INC
Entity Central Index Key	0000866787
Current Fiscal Year End Date	--08-25
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		27,353,015

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Nov. 18, 2017	Aug. 26, 2017
Current assets:
Cash and cash equivalents	$ 257,677	$ 293,270
Accounts receivable	272,450	280,733
Merchandise inventories	4,012,104	3,882,086
Other current assets	174,961	155,166
Total current assets	4,717,192	4,611,255
Property and equipment:
Property and equipment	6,952,694	6,873,193
Less: Accumulated depreciation and amortization	(2,891,743)	(2,842,175)
Property and equipment, net	4,060,951	4,031,018
Goodwill	391,887	391,887
Deferred income taxes	33,990	35,308
Other long-term assets	193,064	190,313
Other long-term assets, total	618,941	617,508
Assets	9,397,084	9,259,781
Current liabilities:
Accounts payable	4,326,737	4,168,940
Accrued expenses and other	583,972	563,350
Income taxes payable	156,931	34,011
Total current liabilities	5,067,640	4,766,301
Long-term debt	4,982,984	5,081,238
Deferred income taxes	382,244	371,111
Other long-term liabilities	489,315	469,508
Commitments and contingencies
Stockholders' deficit:
Preferred stock, authorized 1,000 shares; no shares issued	0	0
Common stock, par value $.01 per share, authorized 200,000 shares; 28,761 shares issued and 27,262 shares outstanding as of November 18, 2017; 28,735 shares issued and 27,833 shares outstanding as of August 26, 2017	288	287
Additional paid-in capital	1,103,412	1,086,671
Retained deficit	(1,361,385)	(1,642,387)
Accumulated other comprehensive loss	(296,451)	(254,557)
Treasury stock, at cost	(970,963)	(618,391)
Total stockholders' deficit	(1,525,099)	(1,428,377)
Liabilities and Stockholders' Deficit	$ 9,397,084	$ 9,259,781

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Nov. 18, 2017	Aug. 26, 2017
Statement of Financial Position [Abstract]
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	28,761,000	28,735,000
Common stock, shares outstanding	27,262,000	27,833,000

Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Nov. 18, 2017	Nov. 19, 2016
Income Statement [Abstract]
Net sales	$ 2,589,131	$ 2,467,845
Cost of sales, including warehouse and delivery expenses	1,223,283	1,166,303
Gross profit	1,365,848	1,301,542
Operating, selling, general and administrative expenses	897,094	842,640
Operating profit	468,754	458,902
Interest expense, net	38,889	33,306
Income before income taxes	429,865	425,596
Income taxes	148,862	147,471
Net income	$ 281,003	$ 278,125
Weighted average shares for basic earnings per share	27,638	28,951
Effect of dilutive stock equivalents	458	752
Weighted average shares for diluted earnings per share	28,096	29,703
Basic earnings per share	$ 10.17	$ 9.61
Diluted earnings per share	$ 10.00	$ 9.36

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands

3 Months Ended

Nov. 18, 2017

Nov. 19, 2016

Statement of Comprehensive Income [Abstract]

Net income

$ 281,003

$ 278,125

Other comprehensive loss:

Pension liability adjustments, net of taxes

^[1]

1,316

1,816

Foreign currency translation adjustments

(43,217)

(40,591)

Unrealized losses on marketable securities, net of taxes

^[2]

(316)

(229)

Net derivative activities, net of taxes

^[3]

323

330

Total other comprehensive loss

(41,894)

(38,674)

Comprehensive income

$ 239,109

$ 239,451

[1]	Pension liability adjustments are presented net of taxes of $1,161 in fiscal 2018 and $1,385 in fiscal 2017.
[2]	Unrealized gains on marketable securities are presented net of taxes of $170 in fiscal 2018 and $144 in fiscal 2017.
[3]	Net derivative activities are presented net of taxes of $186 in fiscal 2018 and $179 in fiscal 2017.

Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Nov. 18, 2017	Nov. 19, 2016
Statement of Comprehensive Income [Abstract]
Pension liability adjustments, taxes	$ 1,161	$ 1,385
Unrealized gains on marketable securities, taxes	170	144
Net derivative activities, taxes	$ 186	$ 179

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Nov. 18, 2017	Nov. 19, 2016
Cash flows from operating activities:
Net income	$ 281,003	$ 278,125
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property and equipment and intangibles	77,986	71,812
Amortization of debt origination fees	1,999	1,950
Deferred income taxes	8,556	6,881
Share-based compensation expense	11,086	9,787
Changes in operating assets and liabilities:
Accounts receivable	6,671	14,935
Merchandise inventories	(151,396)	(160,918)
Accounts payable and accrued expenses	185,009	77,360
Income taxes payable	123,292	95,523
Other, net	20,811	11,045
Net cash provided by operating activities	565,017	406,500
Cash flows from investing activities:
Capital expenditures	(110,278)	(97,917)
Purchase of marketable securities	(61,505)	(10,843)
Proceeds from sale of marketable securities	36,776	8,752
Disposal of capital assets and other, net	354	357
Net cash used in investing activities	(134,653)	(99,651)
Cash flows from financing activities:
Net (payments) proceeds of commercial paper	(99,000)	72,200
Net proceeds from sale of common stock	7,033	5,742
Purchase of treasury stock	(352,572)	(362,634)
Payments of capital lease obligations	(18,000)	(11,012)
Other, net	(1,165)	(2,222)
Net cash used in financing activities	(463,704)	(297,926)
Effect of exchange rate changes on cash	(2,253)	(3,119)
Net (decrease) increase in cash and cash equivalents	(35,593)	5,804
Cash and cash equivalents at beginning of period	293,270	189,734
Cash and cash equivalents at end of period	$ 257,677	$ 195,538

General	3 Months Ended
General	Nov. 18, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General	Note A – General The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and are presented in accordance with the requirements of Form 10-Q and Article 10 of Regulation S-X of the Securities and Exchange Commission’s (the “SEC”) rules and regulations. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments, including normal recurring accruals, considered necessary for a fair presentation have been included. For further information, refer to the consolidated financial statements and related notes included in the AutoZone, Inc. (“AutoZone” or the “Company”) Annual Report on Form 10-K for the year ended August 26, 2017. Operating results for the twelve weeks ended November 18, 2017 are not necessarily indicative of the results that may be expected for the full fiscal year ending August 25, 2018. Each of the first three quarters of AutoZone’s fiscal year consists of 12 weeks, and the fourth quarter consists of 16 or 17 weeks. The fourth quarters for fiscal 2018 and 2017 each have 16 weeks. Additionally, the Company’s business is somewhat seasonal in nature, with the highest sales generally occurring during the months of February through September and the lowest sales generally occurring in the months of December and January. Recently Issued Accounting Pronouncements: In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2014-09, Revenue from Contracts with Customers. This ASU, along with subsequent ASU’s issued to clarify certain provisions of ASU 2014-09, is a comprehensive new revenue recognition model that expands disclosure requirements and requires a company to recognize revenue to depict the transfer of goods or services to a customer at an amount that reflects the consideration it expects to receive in exchange for those goods or services. It also requires more detailed disclosures to enable users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. This update will be effective for the Company at the beginning of its fiscal 2019 year. The Company established a cross-functional implementation team to evaluate and identify the impact of the new standard on the Company’s financial position, results of operations and cash flows. Based on the preliminary work completed, the Company is considering the potential implications of the new standard on the Company’s recognition of customer related accounts receivable, warranty costs, the Company’s loyalty program, gift cards, subscriptions and other related topics in addition to all applicable financial statement disclosures required by the new guidance. The Company is currently in the process of identifying changes to its business processes, systems and controls to support adoption of the new standard. At this time, the team has not completed its full analysis on impact or means of adoption. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). ASU 2016-02 requires an entity to recognize a right-of-use asset and lease liability for all leases with terms of more than 12 months. Recognition, measurement and presentation of expenses will depend on classification as a finance or operating lease. The amendments also require certain quantitative and qualitative disclosures about leasing arrangements. Early adoption is permitted. The updated guidance requires a modified retrospective adoption. This update will be effective for the Company at the beginning of its fiscal 2020 year. The Company established a cross-functional implementation team to evaluate and identify the impact of ASU 2016-02 on the Company’s financial position, results of operations and cash flows. Based on the preliminary work completed, the Company is considering the possible implications of the new standard, including the discount rate to be used in valuing new and existing leases, the treatment of existing favorable and unfavorable lease agreements acquired in connection with previous acquisitions, procedural and operational changes that may be necessary to comply with the provisions of the guidance and all applicable financial statement disclosures required by the new guidance. The Company is also in the process of identifying changes to its business processes, systems and controls to support adoption of the new standard. At this time, the team has not completed its full analysis and is unable to quantify the impact; however, the Company believes the adoption of the new guidance will have a material impact on the total assets and total liabilities reported on the Company’s consolidated balance sheets. In October 2016, the FASB issued ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other than Inventory. ASU 2016-16 requires that an entity recognize the income tax consequences of an intra-entity transfer of assets other than inventory when the transfer occurs. The guidance must be applied using the modified retrospective basis. The Company does not expect the provisions of ASU 2016-16 to have a material impact on its financial statements. This update will be effective for the Company at the beginning of its fiscal 2019 year. In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. ASU 2017-01provides guidance to assist entities in evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The updated guidance requires a prospective adoption. Early adoption is permitted. The Company does not expect the provisions of ASU 2017-01 to have a material impact on its consolidated financial statements. This update will be effective for the Company at the beginning of its fiscal 2019 year. In March 2017, the FASB issued ASU 2017-07, Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. ASU 2017-07 requires an employer to separate the service cost component from other components of net benefit cost. It also provides specific guidance on the presentation of the service cost component and other components of net benefit in the income statement; only the service cost component of net benefit cost is eligible for capitalization. The Company is in the process of evaluating the effects of the provisions of ASU 2017-07 on its consolidated financial statements. This update will be effective for the Company at the beginning of its fiscal 2019 year.

Share-Based Payments

3 Months Ended

Nov. 18, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Payments

Note B – Share-Based Payments

AutoZone recognizes compensation expense for share-based payments based on the fair value of the awards at the grant date. Share-based payments include stock option grants, restricted stock grants, restricted stock unit grants and the discount on shares sold to employees under share purchase plans. Additionally, directors’ fees are paid in restricted stock units with value equivalent to the value of shares of common stock as of the grant date. The change in fair value of liability-based stock awards is also recognized in share-based compensation expense.

Total share-based compensation expense (a component of Operating, selling, general and administrative expenses) was $11.1 million for the twelve week period ended November 18, 2017, and $9.8 million for the comparable prior year period.

During the twelve week period ended November 18, 2017, 24,761 stock options were exercised at a weighted average exercise price of $284.04. In the comparable prior year period, 22,612 stock options were exercised at a weighted average exercise price of $301.09.

The Company made stock option grants of 282,820 shares during the twelve week period ended November 18, 2017, and granted options to purchase 288,305 shares during the comparable prior year period. The weighted average fair value of the stock option awards granted during the twelve week periods ended November 18, 2017, and November 19, 2016, using the Black-Scholes-Merton multiple-option pricing valuation model, was $128.93 and $139.66 per share, respectively, using the following weighted average key assumptions:


	Twelve Weeks Ended
	November 18, 2017		November 19, 2016
Expected price volatility		20%		18%
Risk-free interest rate		1.9%		1.2%
Weighted average expected lives (in years)		5.1		5.1
Forfeiture rate		10%		10%
Dividend yield		0%		0%

See AutoZone’s Annual Report on Form 10-K for the year ended August 26, 2017, for a discussion regarding the methodology used in developing AutoZone’s assumptions to determine the fair value of the option awards and a description of AutoZone’s Amended and Restated 2011 Equity Incentive Award Plan, the 2011 Director Compensation Program and the 2014 Director Compensation Plan.

For the twelve week period ended November 18, 2017, 802,195 stock options were excluded from the diluted earnings per share computation because they would have been anti-dilutive. For the comparable prior year period, 564,119 anti-dilutive shares were excluded from the dilutive earnings per share computation.

Fair Value Measurements

3 Months Ended

Nov. 18, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurements

Note C – Fair Value Measurements

The Company defines fair value as the price received to transfer an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The Company uses the fair value hierarchy, which prioritizes the inputs used to measure fair value. The hierarchy, as defined below, gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The three levels of the fair value hierarchy are set forth below:

Level 1 inputs—unadjusted quoted prices in active markets for identical assets or liabilities that the Company can access at the measurement date.

Level 2 inputs—inputs other than quoted market prices included within Level 1 that are observable, either directly or indirectly, for the asset or liability.

Level 3 inputs—unobservable inputs for the asset or liability, which are based on the Company’s own assumptions as there is little, if any, observable activity in identical assets or liabilities.

Financial Assets & Liabilities Measured at Fair Value on a Recurring Basis

The Company’s assets and liabilities measured at fair value on a recurring basis were as follows:


	November 18, 2017
(in thousands)	Level 1		Level 2		Level 3		Fair Value
Other current assets	$	42,587	$	447	$	—	$	43,034
Other long-term assets		54,467		27,614		—		82,081

	$	97,054	$	28,061	$	—	$	125,115


	August 26, 2017
(in thousands)	Level 1		Level 2		Level 3		Fair Value
Other current assets	$	18,453	$	120	$	—	$	18,573
Other long-term assets		53,319		28,981		—		82,300

	$	71,772	$	29,101	$	—	$	100,873

At November 18, 2017, the fair value measurement amounts for assets and liabilities recorded in the accompanying Condensed Consolidated Balance Sheet consisted of short-term marketable securities of $43.0 million, which are included within Other current assets, and long-term marketable securities of $82.1 million, which are included in Other long-term assets. The Company’s marketable securities are typically valued at the closing price in the principal active market as of the last business day of the quarter or through the use of other market inputs relating to the securities, including benchmark yields and reported trades. The fair values of the marketable securities, by asset class, are described in “Note D – Marketable Securities.”

Non-Financial Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis

Certain non-financial assets and liabilities are required to be measured at fair value on a non-recurring basis in certain circumstances, including the event of impairment. These non-financial assets and liabilities could include assets and liabilities acquired in an acquisition as well as property, plant and equipment that are determined to be impaired. As of November 18, 2017, and August 26, 2017, the Company did not have any significant non-financial assets or liabilities that had been measured at fair value on a non-recurring basis subsequent to initial recognition.

Financial Instruments not Recognized at Fair Value

The Company has financial instruments, including cash and cash equivalents, accounts receivable, other current assets and accounts payable. The carrying amounts of these financial instruments approximate fair value because of their short maturities. A discussion of the carrying values and fair values of the Company’s debt is included in “Note H – Financing.”

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Marketable Securities

3 Months Ended

Nov. 18, 2017

Investments, Debt and Equity Securities [Abstract]

Marketable Securities

Note D – Marketable Securities

The Company’s basis for determining the cost of a security sold is the “Specific Identification Model.” Unrealized gains (losses) on marketable securities are recorded in Accumulated other comprehensive loss. The Company’s available-for-sale marketable securities consisted of the following:


	November 18, 2017
(in thousands)	Amortized Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Corporate securities	$	75,729	$	8	$	(302	)	$	75,435
Government bonds		18,685		—		(82	)		18,603
Mortgage-backed securities		4,385		1		(52	)		4,334
Asset-backed securities and other		26,813		1		(71	)		26,743

	$	125,612	$	10	$	(507	)	$	125,115


	August 26, 2017
(in thousands)	Amortized Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Corporate securities	$	39,917	$	73	$	(13	)	$	39,977
Government bonds		31,076		49		(74	)		31,051
Mortgage-backed securities		4,850		2		(42	)		4,810
Asset-backed securities and other		25,042		28		(35	)		25,035

	$	100,885	$	152	$	(164	)	$	100,873

The debt securities held at November 18, 2017, had effective maturities ranging from less than one year to approximately three years. The Company did not realize any material gains or losses on its marketable securities during the twelve week period ended November 18, 2017.

The Company holds 102 securities that are in an unrealized loss position of approximately $507 thousand at November 18, 2017. The Company has the intent and ability to hold these investments until recovery of fair value or maturity, and does not deem the investments to be impaired on an other than temporary basis. In evaluating whether the securities are deemed to be impaired on an other than temporary basis, the Company considers factors such as the duration and severity of the loss position, the credit worthiness of the investee, the term to maturity and the intent and ability to hold the investments until maturity or until recovery of fair value.

Included above in total marketable securities are $85.3 million of marketable securities transferred by the Company’s insurance captive to a trust account to secure its obligations to an insurance company related to future workers’ compensation and casualty losses.

Derivative Financial Instruments	3 Months Ended
Derivative Financial Instruments	Nov. 18, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Note E – Derivative Financial Instruments At November 18, 2017, the Company had $9.6 million recorded in Accumulated other comprehensive loss related to realized losses associated with terminated interest rate swap and treasury rate lock derivatives which were designated as hedging instruments. Net losses are amortized into Interest expense over the remaining life of the associated debt. During the twelve week period ended November 18, 2017, the Company reclassified $509 thousand of net losses from Accumulated other comprehensive loss to Interest expense. In the comparable prior year period, the Company reclassified $509 thousand of net losses from Accumulated other comprehensive loss to Interest expense. The Company expects to reclassify $2.2 million of net losses from Accumulated other comprehensive loss to Interest expense over the next 12 months.

Merchandise Inventories	3 Months Ended
Merchandise Inventories	Nov. 18, 2017
Inventory Disclosure [Abstract]
Merchandise Inventories	Note F – Merchandise Inventories Merchandise inventories are stated at the lower of cost or market. Merchandise inventories include related purchasing, storage and handling costs. Inventory cost has been determined using the last-in, first-out (“LIFO”) method for domestic inventories and the weighted average cost method for Mexico and Brazil inventories. Due to price deflation on the Company’s merchandise purchases, the Company has exhausted its LIFO reserve balance. The Company’s policy is not to write up inventory in excess of replacement cost, which is based on average cost. The difference between LIFO cost and replacement cost, which will be reduced upon experiencing price inflation on the Company’s merchandise purchases, was $425.9 million at November 18, 2017 and $414.9 million at August 26, 2017.

Pension and Savings Plans

3 Months Ended

Nov. 18, 2017

Retirement Benefits [Abstract]

Pension and Savings Plans

Note G – Pension and Savings Plans

The components of net periodic pension expense related to the Company’s pension plans consisted of the following:


	Twelve Weeks Ended
(in thousands)	November 18, 2017			November 19, 2016
Interest cost	$	2,390		$	2,385
Expected return on plan assets		(4,384	)		(4,628	)
Amortization of net loss		2,477			3,201

Net periodic pension expense	$	483		$	958

The Company makes contributions in amounts at least equal to the minimum funding requirements of the Employee Retirement Income Security Act of 1974, as amended by the Pension Protection Act of 2006. During the twelve week period ended November 18, 2017, the Company did not make contributions to its funded plan. The Company expects to contribute approximately $20.3 million to the plan during the remainder of fiscal 2018; however, a change to the expected cash funding may be impacted by a change in interest rates, a change in the actual or expected return on plan assets or through other plans initiated by management.

Financing

3 Months Ended

Nov. 18, 2017

Debt Disclosure [Abstract]

Financing

Note H – Financing

The Company’s long-term debt consisted of the following:


(in thousands)	November 18, 2017		August 26, 2017
7.125% Senior Notes due August 2018, effective interest rate of 7.28%	$	250,000	$	250,000
1.625% Senior Notes due April 2019, effective interest rate of 1.77%		250,000		250,000
4.000% Senior Notes due November 2020, effective interest rate of 4.43%		500,000		500,000
2.500% Senior Notes due April 2021, effective interest rate of 2.62%		250,000		250,000
3.700% Senior Notes due April 2022, effective interest rate of 3.85%		500,000		500,000
2.875% Senior Notes due January 2023, effective interest rate of 3.21%		300,000		300,000
3.125% Senior Notes due July 2023, effective interest rate of 3.26%		500,000		500,000
3.250% Senior Notes due April 2025, effective interest rate 3.36%		400,000		400,000
3.125% Senior Notes due April 2026, effective interest rate of 3.28%		400,000		400,000
3.750% Senior Notes due June 2027, effective interest rate of 3.83%		600,000		600,000
Commercial paper, weighted average interest rate of 1.44% and 1.44% at November 18, 2017 and August 26, 2017, respectively		1,056,100		1,155,100

Total debt before discounts and debt issuance costs		5,006,100		5,105,100
Less: Discounts and debt issuance costs		23,116		23,862

Long-term debt	$	4,982,984	$	5,081,238

As of November 18, 2017, the commercial paper borrowings and the $250 million 7.125% Senior Notes due August 2018 were classified as long-term in the accompanying Consolidated Balance Sheets as the Company had the ability and intent to refinance on a long-term basis through available capacity in its revolving credit facilities. As of November 18, 2017, the Company had $1.997 billion of availability under its $2.0 billion revolving credit facilities, which would allow it to replace these short-term obligations with long-term financing facilities.

The Company entered into a Master Extension, New Commitment and Amendment Agreement dated as of November 18, 2017 (the “Extension Amendment”) to the Third Amended and Restated Credit Agreement dated as of November 18, 2016, as amended, modified, extended or restated from time to time among AutoZone as Borrower, the several lenders from time to time party thereto, and Bank of America, N.A. as Administrative Agent and Swingline Lender, JPMorgan Chase Bank, N.A. as Syndication Agent (“JPMorgan”), arranged by Merrill Lynch, Pierce, Fenner & Smith Incorporated (“Merrill Lynch”) and J.P. Morgan as Joint Lead Arrangers and Merrill Lynch, J.P. Morgan, SunTrust Robinson Humphrey, Inc., U.S. Bank National Association, Wells Fargo Securities, LLC and Barclays Capital as Joint Book Runners (the “Revolving Credit Agreement”). Under the Extension Amendment: (i) the Company’s borrowing capacity under the Revolving Credit Agreement was increased from $1.6 billion to $2.0 billion; (ii) the Company’s option to increase its borrowing capacity under the Revolving Credit Agreement was “refreshed” and the amount of such option remains at $400 million; the maximum borrowing under the Revolving Credit Agreement may, at the Company’s option, subject to lenders approval, be increased from $2.0 billion to $2.4 billion; (iii) the termination date of the Revolving Credit Agreement was extended from November 18, 2021 until November 18, 2022; and (iv) the Company has the option to make one additional written request of the lenders to extend the termination date then in effect for an additional one year. Under the revolving credit facility, the Company may borrow funds consisting of Eurodollar loans, base rate loans or a combination of both. Interest accrues on Eurodollar loans at a defined Eurodollar rate, defined as LIBOR plus the applicable percentage, as defined in the revolving credit facility, depending upon the Company’s senior, unsecured, (non-credit enhanced) long-term debt rating. Interest accrues on base rate loans as defined in the credit facility. The Extension Amendment made no other changes to the Revolving Credit Agreement. As of November 18, 2017, the Company had $3.3 million of outstanding letters of credit under the Revolving Credit Agreement.

On November 18, 2016, the Company amended and restated its existing 364-Day revolving credit facility (the “New 364-Day Credit Agreement”) by decreasing the committed credit amount from $500 million to $400 million, extending the expiration date by one year and renegotiating other terms and conditions. The credit facility was available to primarily support commercial paper borrowings and other short-term unsecured bank loans. Under the credit facility, the Company could borrow funds consisting of Eurodollar loans, base rate loans or a combination of both. Interest accrued on Eurodollar loans at a defined Eurodollar rate, defined as LIBOR plus the applicable margin, as defined in the revolving credit facility, depending upon the Company’s senior, unsecured, (non-credit enhanced) long-term debt rating. Interest accrued on base rate loans as defined in the credit facility. The New 364-Day Credit Agreement expired on November 17, 2017 and the Company did not renew this revolving credit facility.

The fair value of the Company’s debt was estimated at $5.052 billion as of November 18, 2017, and $5.171 billion as of August 26, 2017, based on the quoted market prices for the same or similar issues or on the current rates available to the Company for debt of the same terms (Level 2). Such fair value is greater than the carrying value of debt by $69.1 million at November 18, 2017, and $90.3 million at August 26, 2017, which reflects their face amount, adjusted for any unamortized debt issuance costs and discounts.

All senior notes are subject to an interest rate adjustment if the debt ratings assigned to the senior notes are downgraded (as defined in the agreements). Further, the senior notes contain a provision that repayment of the senior notes may be accelerated if we experience a change in control (as defined in the agreements). Our borrowings under our senior notes contain minimal covenants, primarily restrictions on liens. Under our revolving credit facilities, covenants include restrictions on liens, a maximum debt to earnings ratio, a minimum fixed charge coverage ratio and a change of control provision that may require acceleration of the repayment obligations under certain circumstances. All of the repayment obligations under our borrowing arrangements may be accelerated and come due prior to the scheduled payment date if covenants are breached or an event of default occurs. As of November 18, 2017, we were in compliance with all covenants and expect to remain in compliance with all covenants under our borrowing arrangements.

Stock Repurchase Program	3 Months Ended
Stock Repurchase Program	Nov. 18, 2017
Equity [Abstract]
Stock Repurchase Program	Note I – Stock Repurchase Program From January 1, 1998 to November 18, 2017, the Company has repurchased a total of 142.9 million shares of its common stock at an aggregate cost of $18.179 billion, including 597,430 shares of its common stock at an aggregate cost of $352.6 million during the twelve week period ended November 18, 2017. On March 21, 2017, the Board voted to increase the authorization by $750 million. This raised the total value of shares authorized to be repurchased to $18.65 billion. Considering the cumulative repurchases as of November 18, 2017, the Company had $471.1 million remaining under the Board’s authorization to repurchase its common stock. Subsequent to November 18, 2017, the Company has repurchased 13,002 shares of its common stock at an aggregate cost of $8.0 million.

Accumulated Other Comprehensive Loss

3 Months Ended

Nov. 18, 2017

Equity [Abstract]

Accumulated Other Comprehensive Loss

Note J – Accumulated Other Comprehensive Loss

Accumulated other comprehensive loss includes certain adjustments to pension liabilities, foreign currency translation adjustments, certain activity for interest rate swaps and treasury rate locks that qualify as cash flow hedges and unrealized gains (losses) on available-for-sale securities. Changes in Accumulated other comprehensive loss for the twelve week periods ended November 18, 2017 and November 19, 2016 consisted of the following:


(in thousands)	Pension Liability			Foreign Currency ⁽³⁾			Net Unrealized Gain on Securities			Derivatives			Total
Balance at August 26, 2017	$	(72,376	)	$	(175,814	)	$	(11	)	$	(6,356	)	$	(254,557	)
Other comprehensive (loss) before reclassifications⁽¹⁾		—			(43,217	)		(314	)		—			(43,531	)
Amounts reclassified from Accumulated other comprehensive loss⁽¹⁾		1,316	⁽²⁾		—			(2)	⁽⁴⁾		323	⁽⁵⁾		1,637

Balance at November 18, 2017	$	(71,060	)	$	(219,031	)	$	(327	)	$	(6,033	)	$	(296,451	)


(in thousands)	Pension Liability			Foreign Currency ⁽³⁾			Net Unrealized Gain on Securities			Derivatives			Total
Balance at August 27, 2016	$	(88,890	)	$	(211,012	)	$	120		$	(7,747	)	$	(307,529	)
Other comprehensive (loss) before reclassifications⁽¹⁾		—			(40,591	)		(235	)		—			(40,826	)
Amounts reclassified from Accumulated other comprehensive loss⁽¹⁾		1,816	⁽²⁾		—			6	⁽⁴⁾		330	⁽⁵⁾		2,152

Balance at November 19, 2016	$	(87,074	)	$	(251,603	)	$	(109	)	$	(7,417	)	$	(346,203	)

(1)

Amounts in parentheses indicate debits to Accumulated other comprehensive loss.

(2)

Represents amortization of pension liability adjustments, net of taxes of $1,161 in fiscal 2018 and $1,385 in fiscal 2017, which is recorded in Operating, selling, general and administrative expenses on the Condensed Consolidated Statements of Income. See “Note G – Pension and Savings Plans” for further discussion.

(3)

Foreign currency is not shown net of additional U.S. tax as earnings of non-U.S. subsidiaries are intended to be permanently reinvested.

(4)

Represents realized losses on marketable securities, net of taxes of $1 in fiscal 2018 and $3 in fiscal 2017, which is recorded in Operating, selling, general and administrative expenses on the Condensed Consolidated Statements of Income. See “Note D – Marketable Securities” for further discussion.

(5)

Represents gains and losses on derivatives, net of taxes of $186 in fiscal 2018 and $179 in fiscal 2017, which is recorded in Interest expense, net, on the Condensed Consolidated Statements of Income. See “Note E – Derivative Financial Instruments” for further discussion.

Goodwill and Intangibles

3 Months Ended

Nov. 18, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangibles

Note K – Goodwill and Intangibles

As of November 18, 2017, there were no changes to the carrying amount of goodwill as described in our Annual Report on Form 10-K for the year ended August 26, 2017.

The carrying amounts of intangible assets are included in Other long-term assets as follows:


(in thousands)	Estimated Useful Life		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Amortizing intangible assets:
Technology		3-5 years	$	10,570	$	(9,994	)	$	576
Noncompete agreements		5 years		1,300		(1,223	)		77
Customer relationships		3-10 years		49,676		(26,161	)		23,515

			$	61,546	$	(37,378	)		24,168

Non-amortizing intangible asset:
Trade name									26,900

Total intangible assets other than goodwill								$	51,068

Amortization expense of intangible assets for the twelve week periods ended November 18, 2017 and November 19, 2016 was $1.4 million and $2.0 million, respectively.

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Litigation	3 Months Ended
Litigation	Nov. 18, 2017
Commitments and Contingencies Disclosure [Abstract]
Litigation	Note L – Litigation In July 2014, the Company received a subpoena from the District Attorney of the County of Alameda, along with other environmental prosecutorial offices in the State of California, seeking documents and information related to the handling, storage and disposal of hazardous waste. The Company received notice that the District Attorney will seek injunctive and monetary relief. The Company is cooperating fully with the request and cannot predict the ultimate outcome of these efforts, although the Company has accrued all amounts it believes to be probable and reasonably estimable. The Company does not believe the ultimate resolution of this matter will have a material adverse effect on its consolidated financial position, results of operations or cash flows. The Company is involved in various other legal proceedings incidental to the conduct of its business, including, but not limited to, several lawsuits containing class-action allegations in which the plaintiffs are current and former hourly and salaried employees who allege various wage and hour violations and unlawful termination practices. The Company does not currently believe that, either individually or in the aggregate, these matters will result in liabilities material to its consolidated financial condition, results of operations or cash flows.

Segment Reporting

3 Months Ended

Nov. 18, 2017

Segment Reporting [Abstract]

Segment Reporting

Note M – Segment Reporting

The Company’s four operating segments (Domestic Auto Parts, Mexico, Brazil and IMC) are aggregated as one reportable segment: Auto Parts Locations. The criteria the Company used to identify the reportable segment are primarily the nature of the products the Company sells and the operating results that are regularly reviewed by the Company’s chief operating decision maker to make decisions about the resources to be allocated to the business units and to assess performance. The accounting policies of the Company’s reportable segment are the same as those described in Note A in its Annual Report on Form 10-K for the year ended August 26, 2017.

The Auto Parts Locations segment is a retailer and distributor of automotive parts and accessories through the Company’s 6,049 locations in the United States, Puerto Rico, Mexico and Brazil. Each location carries an extensive product line for cars, sport utility vehicles, vans and light trucks, including new and remanufactured automotive hard parts, maintenance items, accessories and non-automotive products.

The Other category reflects business activities of three operating segments that are not separately reportable due to the materiality of these operating segments. The operating segments include ALLDATA, which produces, sells and maintains diagnostic and repair information software used in the automotive repair industry; E-commerce, which includes direct sales to customers through www.autozone.com; and AutoAnything, which includes direct sales to customers through www.autoanything.com.

The Company evaluates its reportable segment primarily on the basis of net sales and segment profit, which is defined as gross profit. Segment results for the periods presented were as follows:


	Twelve Weeks Ended
(in thousands)	November 18, 2017			November 19, 2016
Net Sales
Auto Parts Locations	$	2,510,128		$	2,389,561
Other		79,003			78,284

Total	$	2,589,131		$	2,467,845

Segment Profit
Auto Parts Locations	$	1,322,444		$	1,257,767
Other		43,404			43,775

Gross profit		1,365,848			1,301,542
Operating, selling, general and administrative expenses		(897,094	)		(842,640	)
Interest expense, net		(38,889	)		(33,306	)

Income before income taxes	$	429,865		$	425,596

General (Policies)	3 Months Ended
General (Policies)	Nov. 18, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Fiscal Period	Operating results for the twelve weeks ended November 18, 2017 are not necessarily indicative of the results that may be expected for the full fiscal year ending August 25, 2018. Each of the first three quarters of AutoZone’s fiscal year consists of 12 weeks, and the fourth quarter consists of 16 or 17 weeks. The fourth quarters for fiscal 2018 and 2017 each have 16 weeks. Additionally, the Company’s business is somewhat seasonal in nature, with the highest sales generally occurring during the months of February through September and the lowest sales generally occurring in the months of December and January.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements: In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2014-09, Revenue from Contracts with Customers. This ASU, along with subsequent ASU’s issued to clarify certain provisions of ASU 2014-09, is a comprehensive new revenue recognition model that expands disclosure requirements and requires a company to recognize revenue to depict the transfer of goods or services to a customer at an amount that reflects the consideration it expects to receive in exchange for those goods or services. It also requires more detailed disclosures to enable users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. This update will be effective for the Company at the beginning of its fiscal 2019 year. The Company established a cross-functional implementation team to evaluate and identify the impact of the new standard on the Company’s financial position, results of operations and cash flows. Based on the preliminary work completed, the Company is considering the potential implications of the new standard on the Company’s recognition of customer related accounts receivable, warranty costs, the Company’s loyalty program, gift cards, subscriptions and other related topics in addition to all applicable financial statement disclosures required by the new guidance. The Company is currently in the process of identifying changes to its business processes, systems and controls to support adoption of the new standard. At this time, the team has not completed its full analysis on impact or means of adoption. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). ASU 2016-02 requires an entity to recognize a right-of-use asset and lease liability for all leases with terms of more than 12 months. Recognition, measurement and presentation of expenses will depend on classification as a finance or operating lease. The amendments also require certain quantitative and qualitative disclosures about leasing arrangements. Early adoption is permitted. The updated guidance requires a modified retrospective adoption. This update will be effective for the Company at the beginning of its fiscal 2020 year. The Company established a cross-functional implementation team to evaluate and identify the impact of ASU 2016-02 on the Company’s financial position, results of operations and cash flows. Based on the preliminary work completed, the Company is considering the possible implications of the new standard, including the discount rate to be used in valuing new and existing leases, the treatment of existing favorable and unfavorable lease agreements acquired in connection with previous acquisitions, procedural and operational changes that may be necessary to comply with the provisions of the guidance and all applicable financial statement disclosures required by the new guidance. The Company is also in the process of identifying changes to its business processes, systems and controls to support adoption of the new standard. At this time, the team has not completed its full analysis and is unable to quantify the impact; however, the Company believes the adoption of the new guidance will have a material impact on the total assets and total liabilities reported on the Company’s consolidated balance sheets. In October 2016, the FASB issued ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other than Inventory. ASU 2016-16 requires that an entity recognize the income tax consequences of an intra-entity transfer of assets other than inventory when the transfer occurs. The guidance must be applied using the modified retrospective basis. The Company does not expect the provisions of ASU 2016-16 to have a material impact on its financial statements. This update will be effective for the Company at the beginning of its fiscal 2019 year. In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. ASU 2017-01provides guidance to assist entities in evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The updated guidance requires a prospective adoption. Early adoption is permitted. The Company does not expect the provisions of ASU 2017-01 to have a material impact on its consolidated financial statements. This update will be effective for the Company at the beginning of its fiscal 2019 year. In March 2017, the FASB issued ASU 2017-07, Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. ASU 2017-07 requires an employer to separate the service cost component from other components of net benefit cost. It also provides specific guidance on the presentation of the service cost component and other components of net benefit in the income statement; only the service cost component of net benefit cost is eligible for capitalization. The Company is in the process of evaluating the effects of the provisions of ASU 2017-07 on its consolidated financial statements. This update will be effective for the Company at the beginning of its fiscal 2019 year.

Share-Based Payments (Tables)

3 Months Ended

Nov. 18, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Weighted Average for Key Assumptions Used in Determining Fair Value of Options Granted and Related Share-Based Compensation Expense

The weighted average fair value of the stock option awards granted during the twelve week periods ended November 18, 2017, and November 19, 2016, using the Black-Scholes-Merton multiple-option pricing valuation model, was $128.93 and $139.66 per share, respectively, using the following weighted average key assumptions:


	Twelve Weeks Ended
	November 18, 2017		November 19, 2016
Expected price volatility		20%		18%
Risk-free interest rate		1.9%		1.2%
Weighted average expected lives (in years)		5.1		5.1
Forfeiture rate		10%		10%
Dividend yield		0%		0%

Fair Value Measurements (Tables)

3 Months Ended

Nov. 18, 2017

Fair Value Disclosures [Abstract]

Company's Assets and Liabilities Measured at Fair Value on Recurring Basis

The Company’s assets and liabilities measured at fair value on a recurring basis were as follows:


	November 18, 2017
(in thousands)	Level 1		Level 2		Level 3		Fair Value
Other current assets	$	42,587	$	447	$	—	$	43,034
Other long-term assets		54,467		27,614		—		82,081

	$	97,054	$	28,061	$	—	$	125,115


	August 26, 2017
(in thousands)	Level 1		Level 2		Level 3		Fair Value
Other current assets	$	18,453	$	120	$	—	$	18,573
Other long-term assets		53,319		28,981		—		82,300

	$	71,772	$	29,101	$	—	$	100,873

Marketable Securities (Tables)

3 Months Ended

Nov. 18, 2017

Investments, Debt and Equity Securities [Abstract]

Available-for-Sale Marketable Securities

The Company’s available-for-sale marketable securities consisted of the following:


	November 18, 2017
(in thousands)	Amortized Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Corporate securities	$	75,729	$	8	$	(302	)	$	75,435
Government bonds		18,685		—		(82	)		18,603
Mortgage-backed securities		4,385		1		(52	)		4,334
Asset-backed securities and other		26,813		1		(71	)		26,743

	$	125,612	$	10	$	(507	)	$	125,115


	August 26, 2017
(in thousands)	Amortized Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Corporate securities	$	39,917	$	73	$	(13	)	$	39,977
Government bonds		31,076		49		(74	)		31,051
Mortgage-backed securities		4,850		2		(42	)		4,810
Asset-backed securities and other		25,042		28		(35	)		25,035

	$	100,885	$	152	$	(164	)	$	100,873

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details

Pension and Savings Plans (Tables)

3 Months Ended

Nov. 18, 2017

Retirement Benefits [Abstract]

Net Periodic Benefit Expense

The components of net periodic pension expense related to the Company’s pension plans consisted of the following:


	Twelve Weeks Ended
(in thousands)	November 18, 2017			November 19, 2016
Interest cost	$	2,390		$	2,385
Expected return on plan assets		(4,384	)		(4,628	)
Amortization of net loss		2,477			3,201

Net periodic pension expense	$	483		$	958

Financing (Tables)

3 Months Ended

Nov. 18, 2017

Debt Disclosure [Abstract]

Schedule of Debt

The Company’s long-term debt consisted of the following:


(in thousands)	November 18, 2017		August 26, 2017
7.125% Senior Notes due August 2018, effective interest rate of 7.28%	$	250,000	$	250,000
1.625% Senior Notes due April 2019, effective interest rate of 1.77%		250,000		250,000
4.000% Senior Notes due November 2020, effective interest rate of 4.43%		500,000		500,000
2.500% Senior Notes due April 2021, effective interest rate of 2.62%		250,000		250,000
3.700% Senior Notes due April 2022, effective interest rate of 3.85%		500,000		500,000
2.875% Senior Notes due January 2023, effective interest rate of 3.21%		300,000		300,000
3.125% Senior Notes due July 2023, effective interest rate of 3.26%		500,000		500,000
3.250% Senior Notes due April 2025, effective interest rate 3.36%		400,000		400,000
3.125% Senior Notes due April 2026, effective interest rate of 3.28%		400,000		400,000
3.750% Senior Notes due June 2027, effective interest rate of 3.83%		600,000		600,000
Commercial paper, weighted average interest rate of 1.44% and 1.44% at November 18, 2017 and August 26, 2017, respectively		1,056,100		1,155,100

Total debt before discounts and debt issuance costs		5,006,100		5,105,100
Less: Discounts and debt issuance costs		23,116		23,862

Long-term debt	$	4,982,984	$	5,081,238

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644

+ Details

Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Nov. 18, 2017

Equity [Abstract]

Changes in Accumulated Other Comprehensive Loss

Changes in Accumulated other comprehensive loss for the twelve week periods ended November 18, 2017 and November 19, 2016 consisted of the following:


(in thousands)	Pension Liability			Foreign Currency ⁽³⁾			Net Unrealized Gain on Securities			Derivatives			Total
Balance at August 26, 2017	$	(72,376	)	$	(175,814	)	$	(11	)	$	(6,356	)	$	(254,557	)
Other comprehensive (loss) before reclassifications⁽¹⁾		—			(43,217	)		(314	)		—			(43,531	)
Amounts reclassified from Accumulated other comprehensive loss⁽¹⁾		1,316	⁽²⁾		—			(2)	⁽⁴⁾		323	⁽⁵⁾		1,637

Balance at November 18, 2017	$	(71,060	)	$	(219,031	)	$	(327	)	$	(6,033	)	$	(296,451	)


(in thousands)	Pension Liability			Foreign Currency ⁽³⁾			Net Unrealized Gain on Securities			Derivatives			Total
Balance at August 27, 2016	$	(88,890	)	$	(211,012	)	$	120		$	(7,747	)	$	(307,529	)
Other comprehensive (loss) before reclassifications⁽¹⁾		—			(40,591	)		(235	)		—			(40,826	)
Amounts reclassified from Accumulated other comprehensive loss⁽¹⁾		1,816	⁽²⁾		—			6	⁽⁴⁾		330	⁽⁵⁾		2,152

Balance at November 19, 2016	$	(87,074	)	$	(251,603	)	$	(109	)	$	(7,417	)	$	(346,203	)

(1)

Amounts in parentheses indicate debits to Accumulated other comprehensive loss.

(2)

(3)

Foreign currency is not shown net of additional U.S. tax as earnings of non-U.S. subsidiaries are intended to be permanently reinvested.

(4)

(5)

Goodwill and Intangibles (Tables)

3 Months Ended

Nov. 18, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Carrying Amounts of Intangible Assets

The carrying amounts of intangible assets are included in Other long-term assets as follows:


(in thousands)	Estimated Useful Life		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Amortizing intangible assets:
Technology		3-5 years	$	10,570	$	(9,994	)	$	576
Noncompete agreements		5 years		1,300		(1,223	)		77
Customer relationships		3-10 years		49,676		(26,161	)		23,515

			$	61,546	$	(37,378	)		24,168

Non-amortizing intangible asset:
Trade name									26,900

Total intangible assets other than goodwill								$	51,068

Segment Reporting (Tables)

3 Months Ended

Nov. 18, 2017

Segment Reporting [Abstract]

Segment Results

The Company evaluates its reportable segment primarily on the basis of net sales and segment profit, which is defined as gross profit. Segment results for the periods presented were as follows:


	Twelve Weeks Ended
(in thousands)	November 18, 2017			November 19, 2016
Net Sales
Auto Parts Locations	$	2,510,128		$	2,389,561
Other		79,003			78,284

Total	$	2,589,131		$	2,467,845

Segment Profit
Auto Parts Locations	$	1,322,444		$	1,257,767
Other		43,404			43,775

Gross profit		1,365,848			1,301,542
Operating, selling, general and administrative expenses		(897,094	)		(842,640	)
Interest expense, net		(38,889	)		(33,306	)

Income before income taxes	$	429,865		$	425,596

General - Additional Information (Detail)	3 Months Ended
General - Additional Information (Detail)	Nov. 18, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of reporting periods	Operating results for the twelve weeks ended November 18, 2017 are not necessarily indicative of the results that may be expected for the full fiscal year ending August 25, 2018. Each of the first three quarters of AutoZone’s fiscal year consists of 12 weeks, and the fourth quarter consists of 16 or 17 weeks. The fourth quarters for fiscal 2018 and 2017 each have 16 weeks. Additionally, the Company’s business is somewhat seasonal in nature, with the highest sales generally occurring during the months of February through September and the lowest sales generally occurring in the months of December and January.

Share-Based Payments - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Nov. 18, 2017	Nov. 19, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense related to stock options and share purchase plans	$ 11,086	$ 9,787
Stock options exercised - Shares	24,761	22,612
Stock options exercised - Weighted average exercise price	$ 284.04	$ 301.09
Weighted average grant date fair value of options granted	$ 128.93	$ 139.66
Stock options granted	282,820	288,305
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Anti-dilutive shares excluded from the computation of earnings per share	802,195	564,119

Share-Based Payments - Weighted Average for Key Assumptions Used in Determining Fair Value of Options Granted and Related Share-Based Compensation Expense (Detail)	3 Months Ended
	Nov. 18, 2017	Nov. 19, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Expected price volatility	20.00%	18.00%
Risk-free interest rate	1.90%	1.20%
Weighted average expected lives (in years)	5 years 1 month 6 days	5 years 1 month 6 days
Forfeiture rate	10.00%	10.00%
Dividend yield	0.00%	0.00%

Fair Value Measurements - Company's Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Nov. 18, 2017	Aug. 26, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	$ 125,115	$ 100,873
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other current assets	43,034	18,573
Other long-term assets	82,081	82,300
Total	125,115	100,873
Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other current assets	42,587	18,453
Other long-term assets	54,467	53,319
Total	97,054	71,772
Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other current assets	447	120
Other long-term assets	27,614	28,981
Total	$ 28,061	$ 29,101

- Definition

Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

+ References + Details

Fair Value Measurements - Additional Information (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Nov. 18, 2017	Aug. 26, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term marketable securities	$ 43,034	$ 18,573
Long-term marketable securities	$ 82,081	$ 82,300

- Definition

+ References + Details

Marketable Securities - Available-for-Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Nov. 18, 2017	Aug. 26, 2017
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	$ 125,612	$ 100,885
Available-For-Sale Marketable Securities, Gross Unrealized Gains	10	152
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(507)	(164)
Available-For-Sale Marketable Securities, Fair Value	125,115	100,873
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	75,729	39,917
Available-For-Sale Marketable Securities, Gross Unrealized Gains	8	73
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(302)	(13)
Available-For-Sale Marketable Securities, Fair Value	75,435	39,977
Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	18,685	31,076
Available-For-Sale Marketable Securities, Gross Unrealized Gains		49
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(82)	(74)
Available-For-Sale Marketable Securities, Fair Value	18,603	31,051
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	4,385	4,850
Available-For-Sale Marketable Securities, Gross Unrealized Gains	1	2
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(52)	(42)
Available-For-Sale Marketable Securities, Fair Value	4,334	4,810
Asset-Backed Securities and Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	26,813	25,042
Available-For-Sale Marketable Securities, Gross Unrealized Gains	1	28
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(71)	(35)
Available-For-Sale Marketable Securities, Fair Value	$ 26,743	$ 25,035

Marketable Securities - Additional Information (Detail) $ in Thousands	3 Months Ended
	Nov. 18, 2017 USD ($) Securities	Aug. 26, 2017 USD ($)
Investments, Debt and Equity Securities [Abstract]
Available for sale securities debt maturity period range	Less than one year to approximately three years
Number of securities available for sale loss position \| Securities	102
Available-For-Sale Marketable Securities, Gross Unrealized Losses	$ 507	$ 164
Marketable securities transferred	$ 85,300

Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Nov. 18, 2017	Nov. 19, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative losses recorded in Accumulated other comprehensive loss	$ 9,600
Net derivative losses amortized into Interest expense	509	$ 509
Net derivative loss expected to be reclassified over next 12 months	$ 2,200

Merchandise Inventories - Additional Information (Detail) - USD ($) $ in Millions	Nov. 18, 2017	Aug. 26, 2017
Inventory Disclosure [Abstract]
Unrecorded adjustment for LIFO value in excess of replacement value	$ 425.9	$ 414.9

Pension and Savings Plans - Net Periodic Benefit Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Nov. 18, 2017	Nov. 19, 2016
Retirement Benefits [Abstract]
Interest cost	$ 2,390	$ 2,385
Expected return on plan assets	(4,384)	(4,628)
Amortization of net loss	2,477	3,201
Net periodic pension expense	$ 483	$ 958

Pension and Savings Plans - Additional Information (Detail)	3 Months Ended
	Nov. 18, 2017 USD ($)
Retirement Benefits [Abstract]
Annual contributions by the Company to pension plans	$ 0
Expected contributions to the plans by the Company in fiscal 2018	$ 20,300,000

Financing - Schedule of Debt (Detail) - USD ($) $ in Thousands	Nov. 18, 2017	Aug. 26, 2017
Debt Instrument [Line Items]
Commercial paper	$ 1,056,100	$ 1,155,100
Total debt before discounts and debt issuance costs	5,006,100	5,105,100
Less: Discounts and debt issuance costs	23,116	23,862
Long-term debt	4,982,984	5,081,238
7.125% Senior Notes due August 2018, effective interest rate of 7.28% [Member]
Debt Instrument [Line Items]
Senior notes	250,000	250,000
1.625% Senior Notes due April 2019, effective interest rate of 1.77% [Member]
Debt Instrument [Line Items]
Senior notes	250,000	250,000
4.000% Senior Notes due November 2020, effective interest rate of 4.43% [Member]
Debt Instrument [Line Items]
Senior notes	500,000	500,000
2.500% Senior Notes due April 2021, effective interest rate of 2.62% [Member]
Debt Instrument [Line Items]
Senior notes	250,000	250,000
3.700% Senior Notes due April 2022, effective interest rate of 3.85% [Member]
Debt Instrument [Line Items]
Senior notes	500,000	500,000
2.875% Senior Notes due January 2023, effective interest rate of 3.21% [Member]
Debt Instrument [Line Items]
Senior notes	300,000	300,000
3.125% Senior Notes due July 2023, effective interest rate of 3.26% [Member]
Debt Instrument [Line Items]
Senior notes	500,000	500,000
3.250% Senior Notes due April 2025, effective interest rate 3.36% [Member]
Debt Instrument [Line Items]
Senior notes	400,000	400,000
3.125% Senior Notes due April 2026, effective interest rate of 3.28% [Member]
Debt Instrument [Line Items]
Senior notes	400,000	400,000
3.750% Senior Notes due June 2027, effective interest rate of 3.83% [Member]
Debt Instrument [Line Items]
Senior notes	$ 600,000	$ 600,000

Financing - Schedule of Debt (Parenthetical) (Detail)	3 Months Ended	12 Months Ended
Financing - Schedule of Debt (Parenthetical) (Detail)	Nov. 18, 2017	Aug. 26, 2017
Commercial paper, weighted average interest rate of 1.44% and 1.44% at November 18, 2017 and August 26, 2017, respectively [Member]
Debt Instrument [Line Items]
Weighted average interest rate of commercial paper	1.44%	1.44%
7.125% Senior Notes due August 2018, effective interest rate of 7.28% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage	7.125%	7.125%
Effective interest rate	7.28%	7.28%
Debt instrument maturity, month and year	2018-08	2018-08
1.625% Senior Notes due April 2019, effective interest rate of 1.77% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage	1.625%	1.625%
Effective interest rate	1.77%	1.77%
Debt instrument maturity, month and year	2019-04	2019-04
4.000% Senior Notes due November 2020, effective interest rate of 4.43% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage	4.00%	4.00%
Effective interest rate	4.43%	4.43%
Debt instrument maturity, month and year	2020-11	2020-11
2.500% Senior Notes due April 2021, effective interest rate of 2.62% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage	2.50%	2.50%
Effective interest rate	2.62%	2.62%
Debt instrument maturity, month and year	2021-04	2021-04
3.700% Senior Notes due April 2022, effective interest rate of 3.85% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage	3.70%	3.70%
Effective interest rate	3.85%	3.85%
Debt instrument maturity, month and year	2022-04	2022-04
2.875% Senior Notes due January 2023, effective interest rate of 3.21% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage	2.875%	2.875%
Effective interest rate	3.21%	3.21%
Debt instrument maturity, month and year	2023-01	2023-01
3.125% Senior Notes due July 2023, effective interest rate of 3.26% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage	3.125%	3.125%
Effective interest rate	3.26%	3.26%
Debt instrument maturity, month and year	2023-07	2023-07
3.250% Senior Notes due April 2025, effective interest rate 3.36% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage	3.25%	3.25%
Effective interest rate	3.36%	3.36%
Debt instrument maturity, month and year	2025-04	2025-04
3.125% Senior Notes due April 2026, effective interest rate of 3.28% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage	3.125%	3.125%
Effective interest rate	3.28%	3.28%
Debt instrument maturity, month and year	2026-04	2026-04
3.750% Senior Notes due June 2027, effective interest rate of 3.83% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage	3.75%	3.75%
Effective interest rate	3.83%	3.83%
Debt instrument maturity, month and year	2027-06	2027-06

Financing - Additional Information (Detail) - USD ($)		3 Months Ended	12 Months Ended
Financing - Additional Information (Detail) - USD ($)	Nov. 18, 2016	Nov. 18, 2017	Aug. 26, 2017
Debt Instrument [Line Items]
Remaining borrowing capacity under revolving credit facility		$ 1,997,000,000
Amount available under credit facility		2,000,000,000
Fair value of the Company's debt		5,052,000,000	$ 5,171,000,000
Excess (shortfall) of fair value of debt over (from) carrying value		69,100,000	90,300,000
Third Amended and Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Amount available under credit facility		$ 1,600,000,000
New 364-Day Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Maximum amount available under credit facility	$ 400,000,000
Credit facility expiration date		Nov. 17, 2017
Credit Agreement description		The credit facility is available to primarily support commercial paper borrowings and other short-term unsecured bank loans. Under the credit facility, the Company may borrow funds consisting of Eurodollar loans, base rate loans or a combination of both. Interest accrues on Eurodollar loans at a defined Eurodollar rate, defined as LIBOR plus the applicable margin, as defined in the revolving credit facility, depending upon the Company’s senior, unsecured, (non-credit enhanced) long-term debt rating. Interest accrues on base rate loans as defined in the credit facility. The New 364-Day Credit Agreement expired on November 17, 2017 and the Company did not renew this revolving credit facility.
Extended expiration of credit facility	1 year
Credit facility interest rate description		Interest accrues on Eurodollar loans at a defined Eurodollar rate, defined as LIBOR plus the applicable margin, as defined in the revolving credit facility, depending upon the Company's senior, unsecured, (non-credit enhanced) long-term debt rating. Interest accrues on base rate loans as defined in the credit facility.
364-Day Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Maximum amount available under credit facility	$ 500,000,000
Master Extension Agreement [Member]
Debt Instrument [Line Items]
Amount available under credit facility		$ 2,000,000,000
Revolving credit agreement, available additional borrowing capacity		400,000,000
Maximum amount available under credit facility		$ 2,400,000,000
Credit facility expiration date		Nov. 18, 2022
Credit Agreement description		Under the revolving credit facility, the Company may borrow funds consisting of Eurodollar loans, base rate loans or a combination of both. Interest accrues on Eurodollar loans at a defined Eurodollar rate, defined as LIBOR plus the applicable percentage, as defined in the revolving credit facility, depending upon the Company's senior, unsecured, (non-credit enhanced) long-term debt rating. Interest accrues on base rate loans as defined in the credit facility.
Extended expiration of credit facility		1 year
Letters of credit, outstanding		$ 3,300,000
7.125% Senior Notes due August 2018, effective interest rate of 7.28% [Member]
Debt Instrument [Line Items]
Long-term debt		$ 250,000,000	$ 250,000,000
Stated interest rate percentage		7.125%	7.125%
Debt instrument maturity, month and year		2018-08	2018-08

Stock Repurchase Program - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended		239 Months Ended
	Mar. 21, 2017	Dec. 14, 2017	Nov. 18, 2017	Nov. 19, 2016	Nov. 18, 2017
Stock Repurchase Program [Line Items]
Stock repurchased cumulative, shares			597,430		142,900,000
Purchase of treasury stock			$ 352,572,000	$ 362,634,000	$ 18,179,000,000
Repurchased shares of common stock at an aggregate cost			352,600,000
Increase in authorization of stock repurchase, value	$ 750,000,000
Stock repurchase authorized amended value	$ 18,650,000,000
Remaining value authorized for share repurchases			$ 471,100,000		$ 471,100,000
Subsequent Events [Member]
Stock Repurchase Program [Line Items]
Stock repurchased cumulative, shares		13,002
Repurchased shares of common stock at an aggregate cost		$ 8,000,000

Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended
	Nov. 18, 2017	Nov. 19, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (1,428,377)
Ending Balance	(1,525,099)
Pension Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(72,376)	$ (88,890)
Amounts reclassified from Accumulated other comprehensive loss	1,316	1,816
Ending Balance	(71,060)	(87,074)
Foreign Currency [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(175,814)	(211,012)
Other comprehensive (loss) before reclassifications	(43,217)	(40,591)
Ending Balance	(219,031)	(251,603)
Net Unrealized Gain (Loss) on Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(11)	120
Other comprehensive (loss) before reclassifications	(314)	(235)
Amounts reclassified from Accumulated other comprehensive loss	(2)	6
Ending Balance	(327)	(109)
Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(6,356)	(7,747)
Amounts reclassified from Accumulated other comprehensive loss	323	330
Ending Balance	(6,033)	(7,417)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(254,557)	(307,529)
Other comprehensive (loss) before reclassifications	(43,531)	(40,826)
Amounts reclassified from Accumulated other comprehensive loss	1,637	2,152
Ending Balance	$ (296,451)	$ (346,203)

Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Nov. 18, 2017	Nov. 19, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pension liability adjustments, taxes	$ 1,161	$ 1,385
Unrealized gains (losses) on marketable securities, taxes	170	144
Net derivative activities, taxes	186	179
Reclassified from Accumulated Other Comprehensive Income [Member] \| Pension Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pension liability adjustments, taxes	1,161	1,385
Reclassified from Accumulated Other Comprehensive Income [Member] \| Net Unrealized Gain (Loss) on Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gains (losses) on marketable securities, taxes	1	3
Reclassified from Accumulated Other Comprehensive Income [Member] \| Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net derivative activities, taxes	$ 186	$ 179

Goodwill and Intangibles - Schedule of Carrying Amounts of Intangible Assets (Detail) $ in Thousands	3 Months Ended
	Nov. 18, 2017 USD ($)
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Finite Lived, Gross Carrying Amount	$ 61,546
Finite Lived, Accumulated Amortization	(37,378)
Finite Lived, Net Carrying Amount	24,168
Total intangible assets other than goodwill, Net Carrying Amount	51,068
Technology [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Finite Lived, Gross Carrying Amount	10,570
Finite Lived, Accumulated Amortization	(9,994)
Finite Lived, Net Carrying Amount	$ 576
Technology [Member] \| Minimum [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Estimated Useful Life	3 years
Technology [Member] \| Maximum [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Estimated Useful Life	5 years
Noncompete Agreements [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Estimated Useful Life	5 years
Finite Lived, Gross Carrying Amount	$ 1,300
Finite Lived, Accumulated Amortization	(1,223)
Finite Lived, Net Carrying Amount	77
Customer Relationships [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Finite Lived, Gross Carrying Amount	49,676
Finite Lived, Accumulated Amortization	(26,161)
Finite Lived, Net Carrying Amount	$ 23,515
Customer Relationships [Member] \| Minimum [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Estimated Useful Life	3 years
Customer Relationships [Member] \| Maximum [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Estimated Useful Life	10 years
Trade Names [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Non-amortizing intangible asset - Trade name, Net Carrying Amount	$ 26,900

Goodwill and Intangibles - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Nov. 18, 2017	Nov. 19, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense of intangible assets	$ 1.4	$ 2.0

Segment Reporting - Additional Information (Detail)	3 Months Ended
Segment Reporting - Additional Information (Detail)	Nov. 18, 2017 Item Location
Segment Reporting [Abstract]
Number of operating segments	4
Number of reportable segments	1
Number of automotive parts and accessories locations in the United States, Puerto Rico, Mexico, and Brazil \| Location	6,049

Segment Reporting - Segment Results (Detail) - USD ($) $ in Thousands	3 Months Ended
	Nov. 18, 2017	Nov. 19, 2016
Segment Reporting Information [Line Items]
Net sales	$ 2,589,131	$ 2,467,845
Gross profit	1,365,848	1,301,542
Operating, selling, general and administrative expenses	(897,094)	(842,640)
Interest expense, net	(38,889)	(33,306)
Income before income taxes	429,865	425,596
Auto Parts Locations [Member]
Segment Reporting Information [Line Items]
Net sales	2,510,128	2,389,561
Gross profit	1,322,444	1,257,767
Other [Member]
Segment Reporting Information [Line Items]
Net sales	79,003	78,284
Gross profit	$ 43,404	$ 43,775