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Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions | 12 Months Ended
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Aug. 28, 2022 | Aug. 29, 2021 | Aug. 30, 2020
Summary Of Significant Accounting Policies [Line Items] |  |  |
Deferred membership fees | $ 2,174 | $ 2,042 |
Reduction in sales | $ 2,307 | $ 2,047 | $ 1,707

X
- Definition The entity's rewards members receive a cash back reward. These rewards are accounted for as a reduction to sales revenue for this revenue stream. + References No definition available. + Details
Name: | cost_ReductionInSales
Namespace Prefix: | cost_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Summary Of Significant Accounting Policies [Line Items] + References No definition available. + Details
Name: | cost_SummaryOfSignificantAccountingPoliciesLineItems
Namespace Prefix: | cost_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as current. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DeferredRevenueCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant