Accounting Policies [Abstract] Accounting Policies [Abstract] Accounts Payable Current Accounts payable Accounts Receivable Net Current Accounts receivable Accrued Income Taxes Current Income taxes payable Accrued Liabilities Current Accrued expenses and other Accumulated Defined Benefit Plans Adjustment [Member] Pension Liability [Member] Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Less: Accumulated depreciation and amortization Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges [Member] Derivatives [Member] Accumulated Net Unrealized Investment Gain Loss [Member] Net Unrealized Gain on Securities [Member] Accumulated Other Comprehensive Income Loss [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income Loss Net Of Tax Ending Balance Beginning Balance Accumulated other comprehensive loss Accumulated Other Comprehensive Income Loss [Table] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Translation Adjustment [Member] Foreign Currency [Member] Additional Paid In Capital Common Stock Additional paid-in capital Additional Paid In Capital [Member] Additional Paid-In Capital [Member] Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Allocated Share Based Compensation Expense Total share-based compensation expense related to stock options and share purchase plans All Other Segments [Member] Other [Member] Amendment Flag Amendment Flag Amortization Of Financing Costs And Discounts Amortization of debt origination fees Amortization Of Intangible Assets Amortization expense of intangible assets Amortized cost and fair value debt securities. Amortized Cost And Fair Value Debt Securities [Abstract] Amortized Cost and Fair Value Debt Securities [Abstract] Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Anti-dilutive shares excluded from the computation of earnings per share Asset-backed securities and other. Asset Backed Securities And Other [Member] Asset-Backed Securities and Other [Member] Assets Assets Assets [Abstract] Assets Assets Current Total current assets Assets Current [Abstract] Current assets: Assets Fair Value Disclosure Total Auto parts stores. Auto Parts Stores [Member] Auto Parts Stores [Member] Available For Sale Securities Available-For-Sale Marketable Securities, Fair Value Available For Sale Securities Amortized Cost Available-For-Sale Marketable Securities, Amortized Cost Basis Available For Sale Securities Current Other current assets Short-term marketable securities Available for sale securities debt maturity period range. Available For Sale Securities Debt Maturity Period Range Available for sale securities debt maturity period range Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments. Available For Sale Securities Gross Unrealized Gain Accumulated In Investments Available-For-Sale Marketable Securities, Gross Unrealized Gains Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale securities impacting investments. Available For Sale Securities Gross Unrealized Loss Accumulated In Investments Available-For-Sale Marketable Securities, Gross Unrealized Losses Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions 1 Number of securities available for sale loss position Available For Sale Securities Noncurrent Long-term marketable securities Other long-term assets Available For Sale Securities [Text Block] Available-for-Sale Marketable Securities Capital leases. Capital Leases [Member] Capital Leases [Member] Cash And Cash Equivalents At Carrying Value Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Cash and cash equivalents Cash And Cash Equivalents Period Increase Decrease Net (decrease) increase in cash and cash equivalents Commercial Paper [Member] Commercial paper, weighted average interest rate of 0.25% and 0.29% at February 15, 2014 and August 31, 2013, respectively [Member] Commitments And Contingencies Commitments and contingencies Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Common Stock Par Or Stated Value Per Share Common stock, par value Common Stock Shares Authorized Common stock, shares authorized Common Stock Shares Issued Common stock, shares issued Common Stock Shares Outstanding Common stock, shares outstanding Common Stock Value Common stock, par value $.01 per share, authorized 200,000 shares; 33,759 shares issued and 33,355 shares outstanding as of February 15, 2014; 36,768 shares issued and 34,293 shares outstanding as of August 31, 2013 Compensation And Retirement Disclosure [Abstract] Compensation and Retirement Disclosure [Abstract] Comprehensive Income Net Of Tax Comprehensive income Comprehensive Income Note [Text Block] Accumulated Other Comprehensive Loss Corporate Debt Securities [Member] Corporate Securities [Member] Cost Of Goods And Services Sold Cost of sales, including warehouse and delivery expenses Current Fiscal Year End Date Current Fiscal Year End Date Customer Relationships [Member] Customer Relationships [Member] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Text Block] Financing Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument Fair Value Fair value of the Company's debt Debt Instrument Interest Rate Effective Percentage Effective interest rate Debt Instrument Interest Rate Stated Percentage Stated interest rate percentage Debt Instrument Interest Rate Terms Interest accrual on foreign currency loans the basis points Debt Instrument [Line Items] Debt Instrument [Line Items] Debt instrument maturity month year. Debt Instrument Maturity Month Year Debt instrument, due date Debt Instrument Name [Domain] Debt Instrument, Name [Domain] Debt Instrument [Table] Schedule of Long-term Debt Instruments [Table] Debt Longterm And Shortterm Combined Amount Total debt Deferred Income Tax Expense Benefit Deferred income taxes Deferred Tax Assets Net Current Deferred income taxes Deferred Tax Assets Net Noncurrent Deferred income taxes Deferred Tax Liabilities Current Deferred income taxes Defined Benefit Plan Amortization Of Gains Losses Amortization of net loss Defined Benefit Plan Contributions By Employer Annual contributions by the Company to pension plans Defined Benefit Plan Expected Return On Plan Assets Expected return on plan assets Defined Benefit Plan Interest Cost Interest cost Defined Benefit Plan Net Periodic Benefit Cost Net periodic pension expense Defined Benefit Plans Estimated Future Employer Contributions In Current Fiscal Year Expected contributions to the plan in fiscal 2014 Depreciation Depletion And Amortization Depreciation and amortization of property and equipment and intangibles Derivative Instruments And Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments And Hedging Activities Disclosure [Text Block] Derivative Financial Instruments Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net Derivative losses recorded in Accumulated other comprehensive loss Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Share-Based Payments Document and Entity Information. Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Document Fiscal Year Focus Document Fiscal Year Focus Document Period End Date Document Period End Date Document Type Document Type Earnings Per Share Basic Basic earnings per share Earnings Per Share Diluted Diluted earnings per share Effect Of Exchange Rate On Cash And Cash Equivalents Effect of exchange rate changes on cash Entity Central Index Key Entity Central Index Key Entity Common Stock Shares Outstanding Entity Common Stock, Shares Outstanding Entity Filer Category Entity Filer Category Entity Registrant Name Entity Registrant Name Equity [Abstract] Equity [Abstract] Equity Component [Domain] Equity Component [Domain] Excess Of Replacement Or Current Costs Over Stated L I F O Value Unrecorded adjustment for LIFO value in excess of replacement value Excess Tax Benefit From Share Based Compensation Financing Activities Income tax benefit from exercise of stock options Excess Tax Benefit From Share Based Compensation Operating Activities Income tax benefit from exercise of stock options Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Table [Text Block] Company's Assets and Liabilities Measured at Fair Value on Recurring Basis Fair Value By Fair Value Hierarchy Level [Axis] Fair Value, Hierarchy [Axis] Fair Value By Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Fair Value Disclosures [Text Block] Fair Value Measurements Fair Value Inputs Level 1 [Member] Level 1 [Member] Fair Value Inputs Level 2 [Member] Level 2 [Member] Fair Value Inputs Level 3 [Member] Level 3 [Member] Fair value liabilities measured on recurring basis contingent consideration. Fair Value Liabilities Measured On Recurring Basis Contingent Consideration Contingent consideration Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Text Block] Change in Contingent Consideration Liability at Fair Value on Recurring Basis Fair Value Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value Measurements Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value Measurements Recurring [Member] Fair Value, Measurements, Recurring [Member] Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Period Increase Decrease Change in fair value Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value Fair value - end of period Fair value - beginning of period Fair Value Option Aggregate Differences Long Term Debt Instruments Excess (shortfall) of fair value of debt over (from) carrying value Finite lived and indefinite lived intangible assets. Finite Lived And Indefinite Lived Intangible Assets [Line Items] Finite Lived And Indefinite Lived Intangible Assets [Line Items] Finite Lived Intangible Assets Accumulated Amortization Finite Lived, Accumulated Amortization Finite Lived Intangible Assets Amortization Expense After Year Five Thereafter Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year Remainder of fiscal 2014 Finite Lived Intangible Assets Amortization Expense Year Five 2018 Finite Lived Intangible Assets Amortization Expense Year Four 2017 Finite Lived Intangible Assets Amortization Expense Year Three 2016 Finite Lived Intangible Assets Amortization Expense Year Two 2015 Finite Lived Intangible Assets By Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite Lived Intangible Assets Gross Finite Lived, Gross Carrying Amount Finite Lived Intangible Assets Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite Lived Intangible Assets Net Finite Lived, Net Carrying Amount Finite Lived Intangible Asset Useful Life Estimated Useful Life Fiscal Period Fiscal Period Fiscal periods. Fiscal Periods Description of reporting periods Goodwill Net balance as of February 15, 2014 Net balance as of August 31, 2013 Goodwill Goodwill And Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill And Intangible Assets Disclosure [Text Block] Goodwill and Intangibles Goodwill [Line Items] Goodwill [Line Items] Goodwill Period Increase Decrease Goodwill adjustments Gross Profit Gross profit Gross profit Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments Income before income taxes Income Statement [Abstract] Income Statement [Abstract] Income Tax Expense Benefit Income taxes Increase Decrease In Accounts Payable And Accrued Liabilities Accounts payable and accrued expenses Increase Decrease In Accounts Receivable Accounts receivable Increase Decrease In Accrued Income Taxes Payable Income taxes payable Increase Decrease In Finished Goods And Work In Process Inventories Merchandise inventories Increase Decrease In Intangible Assets Current Increase in intangible asset Increase Decrease In Operating Capital [Abstract] Changes in operating assets and liabilities: Increase Decrease In Other Operating Capital Net Other, net Indefinite Lived Intangible Assets By Major Class [Axis] Indefinite-lived Intangible Assets [Axis] Indefinite Lived Intangible Assets Excluding Goodwill Non-amortizing intangible asset - Trade name, Net Carrying Amount Indefinite Lived Intangible Assets Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Intangible Assets Net Excluding Goodwill Total intangible assets other than goodwill, Net Carrying Amount Interest Income Expense Net Interest expense, net Interest expense, net Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net Net derivative losses amortized into Interest expense Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified During Next 12 Months Net Net derivative loss expected to be reclassified over next 12 months Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Inventory Disclosure [Text Block] Merchandise Inventories Inventory Finished Goods Net Of Reserves Merchandise inventories Investments Debt And Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Investments In Debt And Marketable Equity Securities And Certain Trading Assets Disclosure [Text Block] Marketable Securities Legal Matters And Contingencies [Text Block] Litigation Letter Of Credit [Member] Letters of Credit [Member] Liabilities And Stockholders Equity Liabilities and Stockholders' Deficit Liabilities And Stockholders Equity [Abstract] Liabilities and Stockholders' Deficit Liabilities Current Total current liabilities Liabilities Current [Abstract] Current liabilities: Line Of Credit Facility Current Borrowing Capacity Amount available under credit facility Line of credit facility expiration year. Line Of Credit Facility Expiration Year Expiration of credit facility Line Of Credit Facility [Line Items] Line of Credit Facility [Line Items] Line Of Credit Facility Maximum Borrowing Capacity Letter of credit facility, maximum borrowing capacity Line Of Credit Facility Remaining Borrowing Capacity Remaining borrowing capacity under revolving credit facility Line Of Credit Facility [Table] Line of Credit Facility [Table] Longterm Commercial Paper Current And Noncurrent Debt repayment using commercial papers Long Term Debt Noncurrent Long-term debt Longterm Debt Type [Axis] Long-term Debt, Type [Axis] Longterm Debt Type [Domain] Long-term Debt, Type [Domain] Longterm Debt Weighted Average Interest Rate Weighted average interest rate of commercial paper Major Types Of Debt And Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types Of Debt And Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Marketable securities transferred to trust account. Marketable Securities Transferred To Trust Account Marketable securities transferred Maximum [Member] Maximum [Member] Minimum [Member] Minimum [Member] Mortgage Backed Securities [Member] Mortgage-Backed Securities [Member] Net Cash Provided By Used In Financing Activities Net cash used in financing activities Net Cash Provided By Used In Financing Activities [Abstract] Cash flows from financing activities: Net Cash Provided By Used In Investing Activities Net cash used in investing activities Net Cash Provided By Used In Investing Activities [Abstract] Cash flows from investing activities: Net Cash Provided By Used In Operating Activities Net cash provided by operating activities Net Cash Provided By Used In Operating Activities [Abstract] Cash flows from operating activities: Net Income Loss Net income Net income New Accounting Pronouncements Policy Policy [Text Block] Recently Adopted Accounting Pronouncements Noncompete Agreements [Member] Noncompete Agreements [Member] Number Of Operating Segments Number of operating segments Number Of Reportable Segments Number of reportable segments Number Of Stores Number of automotive parts and accessories stores in the United States, Puerto Rico, Mexico, and Brazil Offsetting [Abstract] Offsetting [Abstract] Operating Income Loss Operating profit Organization Consolidation And Presentation Of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization Consolidation And Presentation Of Financial Statements Disclosure [Text Block] General Organization consolidation and presentation of financial statements. Organization Consolidation And Presentation Of Financial Statements [Line Items] Organization Consolidation And Presentation Of Financial Statements [Line Items] Organization consolidation and presentation of financial statements. Organization Consolidation And Presentation Of Financial Statements [Table] Organization Consolidation And Presentation Of Financial Statements [Table] Other Assets Current Other current assets Other Assets Noncurrent Other long-term assets Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax Unrealized (losses) gains on marketable securities, net of taxes Other Comprehensive Income Loss Before Reclassifications Net Of Tax Other comprehensive income (loss) before reclassifications Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax Net derivative activities, net of taxes Other comprehensive income (loss), foreign currency transaction and translation adjustment. Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Foreign currency translation adjustments Other Comprehensive Income Loss Net Of Tax Total other comprehensive (loss) income Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent [Abstract] Other comprehensive (loss) income: Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax Pension liability adjustments, net of taxes Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax Pension liability adjustments, taxes Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax Net derivative activities, taxes Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax Unrealized (losses) gains on marketable securities, taxes Other Liabilities Noncurrent Other long-term liabilities Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold or consumed after one year or beyond the normal operating cycle, if longer, excluding property and equipment, net. Other Non Current Assets Other long-term assets, total Payments For Proceeds From Productive Assets Disposal of capital assets and other, net Payments For Repurchase Of Common Stock Purchase of treasury stock Payments To Acquire Businesses And Interest In Affiliates Acquisition of business Payments To Acquire Intangible Assets Purchase of intangibles Payments To Acquire Marketable Securities Purchase of marketable securities Payments To Acquire Property Plant And Equipment Capital expenditures Pension And Other Postretirement Benefits Disclosure [Text Block] Pension and Savings Plans Number of weeks in first quarter of fiscal year. Period Of First Quarter Of Fiscal Year Period of first quarter of fiscal year Number of weeks in fourth quarter of fiscal year. Period Of Fourth Quarter Of Fiscal Year Period of fourth quarter of fiscal year Number of weeks in second quarter of fiscal year. Period Of Second Quarter Of Fiscal Year Period of second quarter of fiscal year Number of weeks in third quarter of fiscal year. Period Of Third Quarter Of Fiscal Year Period of third quarter of fiscal year Preferred Stock Shares Authorized Preferred stock, shares authorized Preferred Stock Shares Issued Preferred stock, shares issued Preferred Stock Value Preferred stock, authorized 1,000 shares; no shares issued Proceeds From Issuance Of Senior Long Term Debt Proceeds from issuance of debt Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options Net proceeds from sale of common stock Proceeds From Payments For Other Financing Activities Other, net Proceeds From Repayments Of Commercial Paper Net proceeds from commercial paper Proceeds From Repayments Of Short Term Debt Net payments of short-term borrowings Proceeds From Sale And Maturity Of Marketable Securities Proceeds from sale of marketable securities Property Plant And Equipment Gross Property and equipment Property Plant And Equipment Net Property and equipment, net Property Plant And Equipment Net [Abstract] Property and equipment: Range [Axis] Range [Axis] Range [Member] Range [Domain] Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax Amounts reclassified from Accumulated other comprehensive loss Reclassification from accumulated other comprehensive income current period tax. Reclassification From Accumulated Other Comprehensive Income Current Period Tax Reclassification from accumulated other comprehensive income, taxes Reimbursable remediation costs. Reimbursable Remediation Costs Reimbursable remediation costs Remaining value authorized for share repurchases. Remaining Value Authorized For Share Repurchases Remaining value authorized for share repurchases Repayments Of Long Term Capital Lease Obligations Payments of capital lease obligations Repayments Of Long Term Debt Repayment of debt Retained Earnings Accumulated Deficit Retained deficit Retained Earnings [Member] Retained Deficit [Member] Sales Revenue Net Net sales Schedule Of Accumulated Other Comprehensive Income Loss Table [Text Block] Changes in Accumulated Other Comprehensive Loss Schedule Of Available For Sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Schedule Of Available For Sale Securities [Table] Schedule of Available-for-sale Securities [Table] Schedule Of Debt Instruments [Text Block] Schedule of Long-term Debt Schedule Of Defined Benefit Plans Disclosures [Text Block] Net Periodic Pension Expense Schedule of finite lived and indefinite lived intangible assets. Schedule Of Finite Lived And Indefinite Lived Intangible Assets [Table] Schedule Of Finite Lived And Indefinite Lived Intangible Assets [Table] Scheduleof Finite Lived Intangible Assets Future Amortization Expense Table [Text Block] Schedule of Future Amortization Expense for Finite Lived Intangible Assets Schedule Of Finite Lived Intangible Assets Table [Text Block] Schedule of Carrying Amounts of Intangible Assets Schedule Of Goodwill [Table] Schedule of Goodwill [Table] Schedule Of Goodwill [Text Block] Schedule of Changes in Carrying Amount of Goodwill Schedule Of Segment Reporting Information By Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Schedule Of Segment Reporting Information By Segment [Text Block] Segment Results Schedule Of Share Based Payment Award Stock Options Valuation Assumptions Table [Text Block] Weighted Average for Key Assumptions Used in Determining Fair Value of Options Granted Related Share-Based Compensation Expense Segment [Domain] Segments [Domain] Segment Reporting [Abstract] Segment Reporting [Abstract] Segment Reporting Disclosure [Text Block] Segment Reporting Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Selling General And Administrative Expense Operating, selling, general and administrative expenses Operating, selling, general and administrative expenses Senior Long Term Notes Senior notes non current 7.125% senior notes. Senior Notes Eight [Member] 7.125% Senior Notes due August 2018, Effective Interest Rate of 7.28% [Member] 2.875% senior notes. Senior Notes Eleven [Member] 2.875% Senior Notes due January 2023, Effective Interest Rate of 3.21% [Member] 5.75% senior notes. Senior Notes Five [Member] 5.750% Senior Notes due January 2015, Effective Interest Rate of 5.89% [Member] 6.5% senior notes. Senior Notes Four [Member] 6.500% Senior Notes due January 2014, Effective Interest Rate of 6.63% [Member] 4.000% senior notes. Senior Notes Nine [Member] 4.000% Senior Notes due November 2020, Effective Interest Rate of 4.43% [Member] 6.95% senior notes. Senior Notes Seven [Member] 6.950% Senior Notes due June 2016, Effective Interest Rate of 7.09% [Member] 5.5% senior notes. Senior Notes Six [Member] 5.500% Senior Notes due November 2015, Effective Interest Rate of 4.86% [Member] 3.700% senior notes. Senior Notes Ten [Member] 3.700% Senior Notes due April 2022, Effective Interest Rate of 3.85% [Member] 1.3% senior notes. Senior Notes Thirteen [Member] 1.300% Senior Notes due January 2017, Effective Interest Rate of 1.43% [Member] 4.375% senior notes. Senior Notes Three [Member] 4.375% Senior Notes due June 2013, Effective Interest Rate of 5.65% [Member] 3.125% senior notes. Senior Notes Twelve [Member] 3.125% Senior Notes due July 2023, Effective Interest Rate of 3.26% [Member] 5.875% senior notes. Senior Notes Two [Member] 5.750% Senior Notes due January 2015, Effective Interest Rate of 5.89% [Member] Share Based Compensation Share-based compensation expense Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate Dividend yield This is the estimated percentage of options granted that are expected to be forfeited or cancelled before becoming fully vested. This estimate is based on historical experience at the time of valuation and reduces expenses ratably over the vesting period. An increase in the forfeiture rate will decrease compensation expense. This estimate is evaluated periodically based on the extent to which actual forfeitures differ, or are expected to differ, from the previous estimate. Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Forfeiture Rate Forfeiture rate Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term 1 Weighted average expected lives (in years) Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Expected price volatility Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Risk-free interest rate Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Stock options granted Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value Weighted average grant date fair value of options granted Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price Stock options exercised - Weighted average exercise price Short Term Borrowings Less: Short-term borrowings Short-term borrowings Site Contingency Nature And Terms Of Cost Sharing Relationships Site contingency, recovery from third party of environmental remediation cost Statement Business Segments [Axis] Segments [Axis] Statement Equity Components [Axis] Equity Components [Axis] Statement Of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Statement Of Financial Position [Abstract] Statement of Financial Position [Abstract] Statement Of Income And Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Stockholders Equity Total stockholders' deficit Stockholders Equity [Abstract] Stockholders' deficit: Stock Issued During Period Shares Stock Options Exercised Stock options exercised - Shares Stock repurchase authorized during the period value. Stock Repurchase Authorized During Period Value Stock repurchase authorized during the period, value Stock Repurchased During Period Shares Stock repurchased during period, shares Stock Repurchased During Period Value Stock repurchased during period, amount Stock Repurchase Program Authorized Amount Stock repurchase authorized amended value Stock repurchase program. Stock Repurchase Program [Line Items] Stock Repurchase Program [Line Items] Stock repurchase program. Stock Repurchase Program [Table] Stock Repurchase Program [Table] Subsequent Event [Member] Subsequent Event [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Technology Based Intangible Assets [Member] Technology [Member] Trade Names [Member] Trade Name [Member] Treasury Stock Acquired Repurchase Authorization Treasury stock acquired repurchase authorization Treasury Stock Retired Cost Method Amount Treasury stock retired, cost method Treasury Stock Shares Acquired Stock repurchased cumulative, shares Treasury Stock Shares Retired Share of treasury stock retired Treasury Stock [Text Block] Stock Repurchase Program Treasury Stock Value Treasury stock, at cost Treasury Stock Value Acquired Cost Method Purchase of treasury stock U S Government Agencies Debt Securities [Member] Government Bonds [Member] Weighted Average Number Diluted Shares Outstanding Adjustment Effect of dilutive stock equivalents Weighted Average Number Of Diluted Shares Outstanding Weighted average shares for diluted earnings per share Weighted Average Number Of Shares Outstanding Basic Weighted average shares for basic earnings per share