XML 33 R25.htm IDEA: XBRL DOCUMENT v3.24.0.1

Accounting Policies - Additional Information (Detail)	Feb. 18, 2024 warehouse states
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated	874
UNITED STATES
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated	602
Number of states in country | states	47
CANADA
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated	108
MEXICO
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated	40
JAPAN
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated	33
UNITED KINGDOM
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated	29
KOREA
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated	18
AUSTRALIA
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated	15
TAIWAN
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated	14
CHINA
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated	6
SPAIN
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated	4
FRANCE
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated	2
ICELAND
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated	1
NEW ZEALAND
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated	1
SWEDEN
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated	1

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

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the number of stores.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStores
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	srt_StatementGeographicalAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_CA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_MX
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_JP
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_GB
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_KR
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_AU
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_TW
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_CN
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_ES
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_FR
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_IS
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_NZ
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_SE
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: