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	12 Months Ended
	Sep. 03, 2022	Aug. 28, 2021	Aug. 29, 2020
Net Income Per Share [Abstract]
Net income attributable to MSC Industrial as reported	$ 339,786	$ 216,907	$ 251,117
Weighted-average shares outstanding for basic net income per share	55,777	55,737	55,472
Effect of dilutive securities	268	356	171
Weighted-average shares outstanding for diluted net income per share	56,045	56,093	55,643
Basic	$ 6.09	$ 3.89	$ 4.53
Diluted	$ 6.06	$ 3.87	$ 4.51
Potentially dilutive securities	400	314	1,393