Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands		Total	Common Shares	Class B Common Stock	Common Stock Common Shares	Common Stock Class B Common Stock	Capital Surplus	Retained Earnings	Retained Earnings Common Shares	Retained Earnings Class B Common Stock	Accumulated Other Comprehensive Loss
Balance at beginning of period at Aug. 31, 2019		$ 1,641,230			$ 1,533	$ 364	$ 84,946	$ 1,588,075			$ (33,688)
Balance at beginning of period (in shares) at Aug. 31, 2019			15,333	3,643
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		48,242						48,242
Change in fair value of derivatives		(5)									(5)
Foreign currency translation		989									989
Dividends declared Common Stock			$ (3,825)	$ (729)					$ (3,825)	$ (729)
Repurchase of Common Stock		(9,973)			(5)		(274)	(9,694)
Repurchase of common stock (in shares)			(51)
Share-based compensation, net	[1]	77					77
Share-based awards exercised, net	[2]	2			2
Share-based awards exercised, net (in shares)	[2]		16
Balance at end of period at Nov. 30, 2019		1,676,008			1,530	364	84,749	1,622,069			(32,704)
Balance at end of period (in shares) at Nov. 30, 2019			15,298	3,643
Balance at beginning of period at Aug. 31, 2019		1,641,230			1,533	364	84,946	1,588,075			(33,688)
Balance at beginning of period (in shares) at Aug. 31, 2019			15,333	3,643
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		82,922
Foreign currency translation		220
Pension benefit liabilities, net		350
Balance at end of period at Feb. 29, 2020		1,701,438			1,529	364	84,577	1,648,069			(33,101)
Balance at end of period (in shares) at Feb. 29, 2020			15,293	3,643
Balance at beginning of period at Nov. 30, 2019		1,676,008			1,530	364	84,749	1,622,069			(32,704)
Balance at beginning of period (in shares) at Nov. 30, 2019			15,298	3,643
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		34,680						34,680
Change in fair value of derivatives		22									22
Foreign currency translation		(769)									(769)
Pension benefit liabilities, net		350									350
Dividends declared Common Stock			$ (3,835)	$ (729)					(3,835)	(729)
Repurchase of Common Stock		(4,230)			(2)		(112)	(4,116)
Repurchase of common stock (in shares)			(21)
Share-based compensation, net	[1]	(60)					(60)
Share-based awards exercised, net	[2]	1			1
Share-based awards exercised, net (in shares)	[2]		16
Balance at end of period at Feb. 29, 2020		1,701,438			1,529	364	84,577	1,648,069			(33,101)
Balance at end of period (in shares) at Feb. 29, 2020			15,293	3,643
Balance at beginning of period at Aug. 29, 2020		1,741,129			1,525	364	86,645	1,684,565			(31,970)
Balance at beginning of period (in shares) at Aug. 29, 2020			15,251	3,643
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		41,896						41,896
Change in fair value of derivatives		(21)									(21)
Foreign currency translation		1,310									1,310
Dividends declared Common Stock			$ (3,806)	$ (729)					(3,806)	(729)
Repurchase of Common Stock		(7,216)			(4)		(223)	(6,989)
Repurchase of common stock (in shares)			(41)
Share-based compensation, net	[1]	788					788
Share-based awards exercised, net	[2]	1			1
Share-based awards exercised, net (in shares)	[2]		11
Balance at end of period at Nov. 28, 2020		1,773,352			1,522	364	87,210	1,714,937			(30,681)
Balance at end of period (in shares) at Nov. 28, 2020			15,221	3,643
Balance at beginning of period at Aug. 29, 2020		1,741,129			1,525	364	86,645	1,684,565			(31,970)
Balance at beginning of period (in shares) at Aug. 29, 2020			15,251	3,643
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		74,481
Foreign currency translation		3,554
Balance at end of period at Feb. 27, 2021		1,801,110			1,523	364	86,979	1,740,737			(28,493)
Balance at end of period (in shares) at Feb. 27, 2021			15,230	3,643
Balance at beginning of period at Nov. 28, 2020		1,773,352			1,522	364	87,210	1,714,937			(30,681)
Balance at beginning of period (in shares) at Nov. 28, 2020			15,221	3,643
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		32,585						32,585
Change in fair value of derivatives		(56)									(56)
Foreign currency translation		2,244									2,244
Dividends declared Common Stock			$ (3,806)	$ (728)					$ (3,806)	$ (728)
Repurchase of Common Stock		(2,318)			(1)		(66)	(2,251)
Repurchase of common stock (in shares)			(12)
Share-based compensation, net	[1]	(165)					(165)
Share-based awards exercised, net	[2]	2			2
Share-based awards exercised, net (in shares)	[2]		21
Balance at end of period at Feb. 27, 2021		$ 1,801,110			$ 1,523	$ 364	$ 86,979	$ 1,740,737			$ (28,493)
Balance at end of period (in shares) at Feb. 27, 2021			15,230	3,643

[1] These amounts are shown net of any shares withheld by the Company to satisfy certain tax withholdings obligations in connection with the vesting of certain shares of restricted stock or restricted stock units.

[2] These amounts are shown net of the effect of income taxes.