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| <link:definition> 2345308 - Disclosure - Income Taxes (Tables) </link:definition> |
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| <link:definition> 2446429 - Disclosure - Income Taxes (Income Before Income Taxes) (Details) </link:definition> |
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| | | <link:roleType id="IncomeTaxesScheduleofForeignAndDomesticIncomeTaxesDetails" roleURI="http://www.costco.com/role/IncomeTaxesScheduleofForeignAndDomesticIncomeTaxesDetails"> |
| <link:definition> 2447430 - Disclosure - Income Taxes (Schedule of Foreign And Domestic Income Taxes) (Details) </link:definition> |
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| <link:definition> 2448431 - Disclosure - Income Taxes (Reconciliation Between Statutory And Effective Rates) (Details) </link:definition> |
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| | | <link:roleType id="IncomeTaxesComponentsofDeferredTaxAssetsAndLiabilitiesDetails" roleURI="http://www.costco.com/role/IncomeTaxesComponentsofDeferredTaxAssetsAndLiabilitiesDetails"> |
| <link:definition> 2449432 - Disclosure - Income Taxes (Components of Deferred Tax Assets And Liabilities) (Details) </link:definition> |
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| | | <link:roleType id="IncomeTaxesGrossUnrecognizedTaxBenefitsDetails" roleURI="http://www.costco.com/role/IncomeTaxesGrossUnrecognizedTaxBenefitsDetails"> |
| <link:definition> 2450433 - Disclosure - Income Taxes (Gross Unrecognized Tax Benefits) (Details) </link:definition> |
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| | | <link:roleType id="NetIncomeperCommonandCommonEquivalentShare" roleURI="http://www.costco.com/role/NetIncomeperCommonandCommonEquivalentShare"> |
| <link:definition> 2151109 - Disclosure - Net Income per Common and Common Equivalent Share </link:definition> |
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| | | <link:roleType id="NetIncomeperCommonandCommonEquivalentShareNetIncomeperCommonandCommonEquivalentShareTables" roleURI="http://www.costco.com/role/NetIncomeperCommonandCommonEquivalentShareNetIncomeperCommonandCommonEquivalentShareTables"> |
| <link:definition> 2352309 - Disclosure - Net Income per Common and Common Equivalent Share Net Income per Common and Common Equivalent Share (Tables) </link:definition> |
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| | | <link:roleType id="NetIncomeperCommonandCommonEquivalentShareScheduleofEarningsperShareEffectonNetIncomeandWeightedAveregaeNumberofDilutivePotentialCommonStockDetails" roleURI="http://www.costco.com/role/NetIncomeperCommonandCommonEquivalentShareScheduleofEarningsperShareEffectonNetIncomeandWeightedAveregaeNumberofDilutivePotentialCommonStockDetails"> |
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| | | <link:roleType id="CommitmentandContingencies" roleURI="http://www.costco.com/role/CommitmentandContingencies"> |
| <link:definition> 2154110 - Disclosure - Commitment and Contingencies </link:definition> |
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| <link:usedOn> link:calculationLink </link:usedOn> |
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| | | <link:roleType id="CommitmentandContingenciesTables" roleURI="http://www.costco.com/role/CommitmentandContingenciesTables"> |
| <link:definition> 2355310 - Disclosure - Commitment and Contingencies (Tables) </link:definition> |
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| | | <link:roleType id="CommitmentandContingenciesDetails" roleURI="http://www.costco.com/role/CommitmentandContingenciesDetails"> |
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| | | <link:roleType id="SegmentReporting" roleURI="http://www.costco.com/role/SegmentReporting"> |
| <link:definition> 2157111 - Disclosure - Segment Reporting </link:definition> |
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| | | <link:roleType id="SegmentReportingTables" roleURI="http://www.costco.com/role/SegmentReportingTables"> |
| <link:definition> 2358311 - Disclosure - Segment Reporting (Tables) </link:definition> |
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| | | <link:roleType id="SegmentReportingInformationbySegmentDetails" roleURI="http://www.costco.com/role/SegmentReportingInformationbySegmentDetails"> |
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| | | <link:roleType id="SegmentReportingInformationbyItemCategoryDetails" roleURI="http://www.costco.com/role/SegmentReportingInformationbyItemCategoryDetails"> |
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