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Income Taxes Additional Information (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
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Feb. 15, 2015
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Feb. 16, 2014
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Feb. 15, 2015
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Feb. 16, 2014
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| Income Taxes [Line Items] | ||||
| Effective Income Tax Rate Reconciliation, Percent | 30.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 35.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 32.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 34.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations |
| Discrete Income Tax Benefit | $ 45cost_DiscreteIncomeTaxBenefit | $ 44cost_DiscreteIncomeTaxBenefit | ||
| Ownership of employee, shares | 29us-gaap_SharesOutstanding | 29us-gaap_SharesOutstanding | ||
| Foreign Tax Authority [Member] | ||||
| Income Taxes [Line Items] | ||||
| Income Tax Expense (Benefit), Ongoing Tax Matter | 14cost_IncomeTaxExpenseBenefitOngoingTaxMatter / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |
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| Special Dividend [Member] | ||||
| Income Taxes [Line Items] | ||||
| Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount | $ 57us-gaap_IncomeTaxReconciliationDeductionsDividends / cost_DividendsPaidAxis = cost_SpecialDividendMember |
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- Definition
Discrete Income Tax Benefit No definition available.
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Income Tax Expense (Benefit), Ongoing Tax Matter No definition available.
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- Definition
Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for dividend. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Number of shares issued which are neither cancelled nor held in the treasury. No definition available.
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