XML 58 R44.htm IDEA: XBRL DOCUMENT v3.24.3

Accounting Policies - Retirement Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 01, 2024	Sep. 03, 2023	Aug. 28, 2022
Accounting Policies [Abstract]
Minimum number of days of employment to qualify for retirement plan	90 days
Defined contribution plan, cost recognized	$ 963	$ 914	$ 824

X

- Definition

Minimum number of days of employment to qualify for 401(k) Retirement Plan

+ References

No definition available.

+ Details

Name:	cost_MinimumNumberOfDaysOfEmploymentToQualifyForRetirementPlan
Namespace Prefix:	cost_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480794/715-70-50-1

+ Details

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration