| Component: (Network and Table) | |
|---|---|
| Network | 0001000 - Document - Document and Entity Information (http://www.costco.com/role/DocumentAndEntityInformation) |
| Table | (Implied) |
| Reporting Entity [Axis] | 0000909832 (http://www.sec.gov/CIK) |
| Document and Entity Information [Abstract] | Period [Axis] | ||
|---|---|---|---|
2012-09-03 - 2013-09-01 | 2013-10-09 | 2013-02-17 | |
Document and Entity Information [Abstract] | |||
Document Type | 10-K | ||
Amendment Flag | false | ||
Document Period End Date | 2013-09-01 | ||
Document Fiscal Year Focus | 2013 | ||
Document Fiscal Period Focus | FY | ||
Trading Symbol | COST | ||
Entity Registrant Name | COSTCO WHOLESALE CORP /NEW | ||
Entity Central Index Key | 0000909832 | ||
Current Fiscal Year End Date | --09-01 | ||
Entity Well-known Seasoned Issuer | Yes | ||
Entity Current Reporting Status | Yes | ||
Entity Voluntary Filers | No | ||
Entity Filer Category | Large Accelerated Filer | ||
Entity Common Stock, Shares Outstanding | 436,922,037 | ||
Entity Public Float | 44,218,428,626 | ||