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		6 Months Ended
	Feb. 26, 2022	Feb. 27, 2021	Feb. 26, 2022	Feb. 27, 2021
Net Income Per Share [Abstract]
Net income attributable to MSC Industrial as reported	$ 69,931	$ 18,085	$ 135,998	$ 56,539
Weighted-average shares outstanding for basic net income per share	55,799	55,838	55,664	55,749
Effect of dilutive securities	172	295	281	270
Weighted-average shares outstanding for diluted net income per share	55,971	56,133	55,945	56,019
Basic	$ 1.25	$ 0.32	$ 2.44	$ 1.01
Diluted	$ 1.25	$ 0.32	$ 2.43	$ 1.01
Potentially dilutive securities	364	324	379	933