Consolidated Statements of Shareholders' Equity - USD ($) $ 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. 25, 2018		$ 1,464,967			$ 1,543	$ 371	$ 82,973	$ 1,405,239			$ (25,159)
Balance at beginning of period (in shares) at Aug. 25, 2018			15,431,000	3,710,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		38,320						38,320
Change in fair value of derivatives		88									88
Foreign currency translation		(2,282)									(2,282)
Dividends declared Common Stock			$ (1,736)	$ (334)					$ (1,736)	$ (334)
Share-based compensation, net	[1]	1,042					1,042
Share-based awards exercised, net (in shares)	[2]		2,000
Balance at end of period at Nov. 24, 2018		1,539,498			1,543	371	84,015	1,480,922			(27,353)
Balance at end of period (in shares) at Nov. 24, 2018			15,433,000	3,710,000
Balance at beginning of period at Aug. 25, 2018		1,464,967			1,543	371	82,973	1,405,239			(25,159)
Balance at beginning of period (in shares) at Aug. 25, 2018			15,431,000	3,710,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		85,926
Foreign currency translation		(864)
Balance at end of period at Feb. 23, 2019		1,580,790			1,540	371	84,454	1,520,431			(26,006)
Balance at end of period (in shares) at Feb. 23, 2019			15,400,000	3,710,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of change in accounting principle, net		39,433						39,433
Balance at beginning of period at Nov. 24, 2018		1,539,498			1,543	371	84,015	1,480,922			(27,353)
Balance at beginning of period (in shares) at Nov. 24, 2018			15,433,000	3,710,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		47,606						47,606
Change in fair value of derivatives		(71)									(71)
Foreign currency translation		1,418									1,418
Dividends declared Common Stock			$ (1,732)	$ (334)					(1,732)	(334)
Share-based compensation, net	[1]	659					659
Share-based awards exercised, net	[2]	26			1		25
Share-based awards exercised, net (in shares)	[2]		12,000
Repurchase of Common Stock		(6,280)			(4)		(245)	(6,031)
Repurchase of common stock (in shares)			(45,000)
Balance at end of period at Feb. 23, 2019		1,580,790			1,540	371	84,454	1,520,431			(26,006)
Balance at end of period (in shares) at Feb. 23, 2019			15,400,000	3,710,000
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			15,333,000	3,643,000
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)
Shares repurchased		(9,973)			(5)		(274)	(9,694)
Shares repurchased (in shares)			(51,000)
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]		16,000
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			15,298,000	3,643,000
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			15,333,000	3,643,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		82,922
Foreign currency translation		220
Pension benefit liabilities		$ 350
Shares repurchased (in shares)		(71,100)
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			15,293,000	3,643,000
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			15,298,000	3,643,000
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		350									350
Dividends declared Common Stock			$ (3,835)	$ (729)					$ (3,835)	$ (729)
Shares repurchased		$ (4,230)			(2)		(112)	(4,116)
Shares repurchased (in shares)		(20,500)	(21,000)
Share-based compensation, net	[1]	$ 1,651					1,651
Share-based awards exercised, net	[2]	(1,710)			1		(1,711)
Share-based awards exercised, net (in shares)	[2]		16,000
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			15,293,000	3,643,000

[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.