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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Feb. 27, 2021
Feb. 29, 2020
Feb. 27, 2021
Feb. 29, 2020
Net Income Per Share [Abstract]        
Net income attributable to MSC Industrial as reported $ 18,085 $ 55,500 $ 56,539 $ 120,918
Less: Distributed net income available to participating securities       (24)
Undistributed and distributed net income available to common shareholders 18,085 55,500 56,539 120,894
Undistributed and distributed net income available to common shareholders $ 18,085 $ 55,500 $ 56,539 $ 120,894
Weighted average shares outstanding for basic net income per share 55,838 55,467 55,749 55,371
Effect of dilutive securities 295 120 270 174
Weighted average shares outstanding for diluted net income per share 56,133 55,587 56,019 55,545
Basic $ 0.32 $ 1.00 $ 1.01 $ 2.18
Diluted $ 0.32 $ 1.00 $ 1.01 $ 2.18
Potentially dilutive securities 324 1,096 933 1,447