Net Income Per Share (Computation Of Basic And Diluted Net Income Per Common Share Under Treasury Stock Method) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	May 28, 2022	May 29, 2021	May 28, 2022	May 29, 2021
Net Income Per Share [Abstract]
Net income attributable to MSC Industrial as reported	$ 99,657	$ 94,434	$ 235,655	$ 150,973
Weighted-average shares outstanding for basic net income per share	55,914	55,944	55,748	55,814
Effect of dilutive securities	192	408	271	325
Weighted-average shares outstanding for diluted net income per share	56,106	56,352	56,019	56,139
Basic	$ 1.78	$ 1.69	$ 4.23	$ 2.70
Diluted	$ 1.78	$ 1.68	$ 4.21	$ 2.69
Potentially dilutive securities	330	3	363	884