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Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 01, 2024	Sep. 03, 2023	Aug. 28, 2022
Summary Of Significant Accounting Policies [Line Items]
Deferred membership fees	$ 2,501	$ 2,337
Reduction in sales	$ 2,804	$ 2,576	$ 2,307

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

X

- 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
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(20))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_DeferredRevenueCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant