XML 30 R21.htm IDEA: XBRL DOCUMENT
v3.24.1.1.u2

Equity (Tables) | 8 Months Ended
--- | ---
May 12, 2024
Equity [Abstract] |
Stock Repurchased During Period | The following table summarizes the repurchase activity:
| Shares Repurchased (000s) |  | Average Price per Share |  | Total Cost
Third quarter of 2024 | 221 |  |  | $ | 733.23 |  |  | $ | 162 |
First thirty-six weeks of 2024 | 749 |  |  | $ | 646.07 |  |  | $ | 484 |
Third quarter of 2023 | 329 |  |  | $ | 492.71 |  |  | $ | 162 |
First thirty-six weeks of 2023 | 908 |  |  | $ | 492.30 |  |  | $ | 447 |

X
- Definition Schedule of Common Stock Repurchased And Average Price Paid Per Share [Table Text Block] + References No definition available. + Details
Name: | cost_ScheduleOfCommonStockRepurchasedAndAveragePricePaidPerShareTableTextBlock
Namespace Prefix: | cost_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration