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Net Income per Common and Common Equivalent Share (Tables)
 6 Months Ended
Feb. 14, 2021
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table shows the amounts used in computing net income per share and the weighted average number of shares of basic and potentially dilutive common shares outstanding (shares in 000s):
12 Weeks Ended24 Weeks Ended
February 14,
2021		February 16,
2020		February 14,
2021		February 16,
2020
Net income attributable to Costco
$951 $931 $2,117 $1,775 
Weighted average basic shares
443,134 442,021 443,043 441,920 
RSUs1,360 1,706 1,397 1,784 
Weighted average diluted shares
444,494 443,727 444,440 443,704