Consolidated Statements of Shareholders' Equity (USD $) In Thousands, except Share data		Common Stock [Member]	Common Class B [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at Aug. 29, 2009		$ 1,443	$ 493	$ 20,137	$ 605,262	$ (300)	$ 627,035
Balance (shares) at Aug. 29, 2009		14,435,000	4,933,000
Net income		0	0	0	76,408	0	76,408
Pension benefit liabilities, net	[1]	0	0	0	0	(847)	(847)
Foreign currency translation		0	0	0	0	1,801	1,801
Change in interest rate swap, net	[1]	0	0	0	0	1,209	1,209
Comprehensive income							78,571
Dividends declared		0	0	0	(2,794)	0	(2,794)
Shares converted		2	(2)	0	0	0	0
Shares converted (in shares)		20,000	(20,000)
Share-based compensation, net		41	0	3,621	0	0	3,662
Share-based compensation, net (in shares)		412,000	0
Stock options exercised, net	[1]	5	0	1,571	0	0	1,576
Stock options exercised, net (in shares)		46,000	0
Balance at Aug. 28, 2010		1,491	491	25,329	678,876	1,863	708,050
Balance (shares) at Aug. 28, 2010		14,913,000	4,913,000
Net income		0	0	0	76,486	0	76,486
Pension benefit liabilities, net	[1]	0	0	0	0	420	420
Foreign currency translation		0	0	0	0	6,562	6,562
Change in interest rate swap, net	[1]	0	0	0	0	992	992
Comprehensive income							84,460
Dividends declared		0	0	0	(2,832)	0	(2,832)
Shares converted		3	(3)	0	0	0	0
Shares converted (in shares)		26,000	(26,000)
Share-based compensation, net		1	0	6,731	0	0	6,732
Share-based compensation, net (in shares)		6,000	0
Stock options exercised, net	[1]	4	0	1,528	0	0	1,532
Stock options exercised, net (in shares)		42,000	0
Balance at Aug. 27, 2011		1,499	488	33,588	752,530	9,837	797,942
Balance (shares) at Aug. 27, 2011		14,987,000	4,887,000
Net income		0	0	0	94,989	0	94,989
Pension benefit liabilities, net	[1]	0	0	0	0	(362)	(362)
Foreign currency translation		0	0	0	0	(2,204)	(2,204)
Change in interest rate swap, net							0
Comprehensive income							92,423
Dividends declared		0	0	0	(2,843)	0	(2,843)
Shares converted		0	0	0	0	0	0
Shares converted (in shares)		3,000	(3,000)
Share-based compensation, net	[2]	0	0	6,578	0	0	6,578
Share-based compensation, net (in shares)		1,000	0
Stock options exercised, net	[1]	7	0	2,818	0	0	2,825
Stock options exercised, net (in shares)		73,000	0				(73,250)
Balance at Aug. 25, 2012		$ 1,506	$ 488	$ 42,984	$ 844,676	$ 7,271	$ 896,925
Balance (shares) at Aug. 25, 2012		15,064,000	4,884,000

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

[2] These amount shown are net of shares withheld by the Company to satisfy certain tax withholdings obligations in connection with the vesting of certain shares of restricted stock.