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Net Income per Common and Common Equivalent Share (Tables)
 8 Months Ended
May 10, 2020
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 Ended36 Weeks Ended
May 10,
2020		May 12,
2019		May 10,
2020		May 12,
2019
Net income attributable to Costco
$838  $906  $2,613  $2,562  
Weighted average basic shares
442,322  439,859  442,054  439,767  
RSUs1,533  2,783  1,700  2,798  
Weighted average diluted shares
443,855  442,642  443,754  442,565