    <SEC-DOCUMENT>0000909832-24-000043-index.html : 20240926
    <SEC-HEADER>0000909832-24-000043.hdr.sgml : 20240926
    <ACCEPTANCE-DATETIME>20240926161715
    ACCESSION NUMBER:		0000909832-24-000043
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		24
    CONFORMED PERIOD OF REPORT:	20240926
    ITEM INFORMATION:		Results of Operations and Financial Condition
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20240926
    DATE AS OF CHANGE:		20240926

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			COSTCO WHOLESALE CORP /NEW
    		CENTRAL INDEX KEY:			0000909832
    		STANDARD INDUSTRIAL CLASSIFICATION:	RETAIL-VARIETY STORES [5331]
    		ORGANIZATION NAME:           	07 Trade & Services
    		IRS NUMBER:				911223280
    		STATE OF INCORPORATION:			WA
    		FISCAL YEAR END:			0831

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-20355
    		FILM NUMBER:		241329183

    	BUSINESS ADDRESS:
    		STREET 1:		999 LAKE DRIVE
    		CITY:			ISSAQUAH
    		STATE:			WA
    		ZIP:			98027-
    		BUSINESS PHONE:		4253138100

    	MAIL ADDRESS:
    		STREET 1:		999 LAKE DRIVE
    		CITY:			ISSAQUAH
    		STATE:			WA
    		ZIP:			98027

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	COSTCO COMPANIES INC
    		DATE OF NAME CHANGE:	19970401

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	PRICE/COSTCO INC
    		DATE OF NAME CHANGE:	19930728
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>cost-20240926.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: cost-20240926.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>costex9918-k92624.htm
    <DESCRIPTION>EX-99.1
    <TEXT>
    Document 2 - file: costex9918-k92624.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.2
    <SEQUENCE>3
    <FILENAME>costex9928-k92624.htm
    <DESCRIPTION>EX-99.2
    <TEXT>
    Document 3 - file: costex9928-k92624.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>4
    <FILENAME>cost-20240926.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
    <TEXT>
    Document 4 - file: cost-20240926.xsd

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>5
    <FILENAME>cost-20240926_lab.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT
    <TEXT>
    Document 5 - file: cost-20240926_lab.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.PRE
    <SEQUENCE>6
    <FILENAME>cost-20240926_pre.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT
    <TEXT>
    Document 6 - file: cost-20240926_pre.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>costco6a.jpg
    <TEXT>
    Document 7 - file: costco6a.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>costex9928-k92624001.jpg
    <TEXT>
    Document 8 - file: costex9928-k92624001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>costex9928-k92624002.jpg
    <TEXT>
    Document 9 - file: costex9928-k92624002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>costex9928-k92624003.jpg
    <TEXT>
    Document 10 - file: costex9928-k92624003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>costex9928-k92624004.jpg
    <TEXT>
    Document 11 - file: costex9928-k92624004.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>costex9928-k92624005.jpg
    <TEXT>
    Document 12 - file: costex9928-k92624005.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>costex9928-k92624006.jpg
    <TEXT>
    Document 13 - file: costex9928-k92624006.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>costex9928-k92624007.jpg
    <TEXT>
    Document 14 - file: costex9928-k92624007.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>costex9928-k92624008.jpg
    <TEXT>
    Document 15 - file: costex9928-k92624008.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>17
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 17 - file: R1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>18
    <FILENAME>Financial_Report.xlsx
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 18 - file: Financial_Report.xlsx

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>19
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 19 - file: Show.js

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>20
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 20 - file: report.css

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>22
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 22 - file: FilingSummary.html

    Document 22 - RAW XML: FilingSummary.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>25
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 25 - file: MetaLinks.json

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>26
    <FILENAME>0000909832-24-000043-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 26 - file: 0000909832-24-000043-xbrl.zip

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>27
    <FILENAME>cost-20240926_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 27 - file: cost-20240926_htm.html

    Document 27 - RAW XML: cost-20240926_htm.xml

    </DOCUMENT>
    </SEC-DOCUMENT>