Consolidated Statements of Shareholders' Equity - 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)
Share-based compensation, net	[1]	1,575					1,575
Share-based awards exercised, net	[2]	(1,496)			2		(1,498)
Share-based awards exercised, net (in shares)	[2]		16
Repurchase of Common Stock		(9,973)			(5)		(274)	(9,694)
Repurchase of common stock (in shares)			(51)
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. 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)
Share-based compensation, net	[1]	788					788
Share-based awards exercised, net	[2]	1			1
Share-based awards exercised, net (in shares)	[2]		11
Repurchase of Common Stock		(7,216)			(4)		(223)	(6,989)
Repurchase of common stock (in shares)			(41)
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

[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.