Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	May 29, 2021	May 30, 2020	May 29, 2021	May 30, 2020
Net Income Per Share [Abstract]
Net income attributable to MSC Industrial as reported	$ 94,434	$ 77,703	$ 150,973	$ 198,621
Weighted-average shares outstanding for basic net income per share	55,944	55,563	55,814	55,435
Effect of dilutive securities	408	36	325	146
Weighted-average shares outstanding for diluted net income per share	56,352	55,599	56,139	55,581
Basic	$ 1.69	$ 1.40	$ 2.70	$ 3.58
Diluted	$ 1.68	$ 1.40	$ 2.69	$ 3.57
Potentially dilutive securities	3	1,933	884	1,417