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Condensed Consolidated Statements Of Shareholders' Equity - USD ($) $ in Thousands	Class A Common Stock [Member] Common Stock [Member]	Class A Common Stock [Member] Retained Earnings [Member] Regular Dividends [Member]	Class A Common Stock [Member] Retained Earnings [Member] Special Dividends [Member]	Class A Common Stock [Member] Treasury Stock [Member]	Class A Common Stock [Member]	Class B Common Stock [Member] Common Stock [Member]	Class B Common Stock [Member] Retained Earnings [Member] Regular Dividends [Member]	Class B Common Stock [Member] Retained Earnings [Member] Special Dividends [Member]	Class B Common Stock [Member]	Additional Paid-In-Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Total Shareholders' Equity Attributable to MSC Industrial [Member]	Noncontrolling Interest [Member]	Total
Balance, Value at Aug. 31, 2019	$ 46					$ 10				$ 659,226	$ 946,651	$ (22,776)	$ (104,607)		$ 5,329
Foreign Currency Translation Adjustment												723			95	$ 818
Net Income											120,918				90	120,918
Associate Incentive Plans	1									22,431			2,057
Repurchase of Class A common stock, Value				$ (3,208)
Exchange of Class B common stock for Class A common stock, value
Cash dividends declared on common stock		$ (67,939)	$ (226,984)				$ (15,242)	$ (50,650)
Dividend equivalents declared, net of cancellations											(3,358)
Balance, Value at Feb. 29, 2020	47					10				681,657	703,396	(22,053)	(105,758)	$ 1,257,299	5,514	1,262,813
Dividends declared per common share					$ 6.50				$ 6.50
Balance, Value at Nov. 30, 2019	46					10				668,668	970,139	(21,310)	(106,690)		5,503
Foreign Currency Translation Adjustment												(743)			(45)	(788)
Net Income											55,500				56	55,500
Associate Incentive Plans	1									12,989			1,131
Repurchase of Class A common stock, Value				(199)
Exchange of Class B common stock for Class A common stock, value
Cash dividends declared on common stock		(34,048)	(226,984)				(7,597)	(50,650)
Dividend equivalents declared, net of cancellations											(2,964)
Balance, Value at Feb. 29, 2020	47					10				681,657	703,396	(22,053)	(105,758)	1,257,299	5,514	1,262,813
Dividends declared per common share					5.75				5.75
Balance, Value at Aug. 29, 2020	47					10				690,739	749,515	(21,418)	(103,948)		5,628	1,320,573
Foreign Currency Translation Adjustment												2,612			210	2,822
Net Income											56,539				586	56,539
Associate Incentive Plans										22,011			1,822
Repurchase of Class A common stock, Value				(3,519)
Exchange of Class B common stock for Class A common stock, value	1					(1)
Cash dividends declared on common stock		(69,808)	$ (163,511)				(13,877)	$ (31,840)
Dividend equivalents declared, net of cancellations											(3,261)
Balance, Value at Feb. 27, 2021	48					9				712,750	523,757	(18,806)	(105,645)	1,112,113	6,424	1,118,537
Dividends declared per common share					5.00				5.00
Balance, Value at Nov. 28, 2020	48					9				702,341	547,957	(19,683)	(106,197)		6,412
Foreign Currency Translation Adjustment												877			(251)	626
Net Income											18,085				263	18,085
Associate Incentive Plans										10,409			912
Repurchase of Class A common stock, Value				$ (360)
Exchange of Class B common stock for Class A common stock, value
Cash dividends declared on common stock		$ (35,047)					$ (6,823)
Dividend equivalents declared, net of cancellations											(415)
Balance, Value at Feb. 27, 2021	$ 48					$ 9				$ 712,750	$ 523,757	$ (18,806)	$ (105,645)	$ 1,112,113	$ 6,424	$ 1,118,537
Dividends declared per common share					$ 0.75				$ 0.75

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