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. 30, 2008		$ 1,438	$ 494	$ 18,240	$ 532,164	$ 4,434	$ 556,770
Balance (shares) at Aug. 30, 2008		14,389,000	4,935,000
Net income		0	0	0	75,852	0	75,852
Pension benefit liabilities, net	[1]	0	0	0	0	(117)	(117)
Foreign currency translation		0	0	0	0	(2,604)	(2,604)
Change in interest rate swap, net	[1]	0	0	0	0	(2,013)	(2,013)
Comprehensive income							71,118
Dividends declared		0	0	0	(2,754)	0	(2,754)
Shares converted		1	(1)	0	0	0	0
Shares converted (in shares)		2,000	(2,000)
Share-based compensation		1	0	1,024	0	0	1,025
Share-based compensation (in shares)		12,000	0
Stock options exercised, net	[1]	3	0	873	0	0	876
Stock options exercised, net (in shares)		32,000	0
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		41	0	3,621	0	0	3,662
Share-based compensation (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		0	0	0	0	0	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		1	0	6,731	0	0	6,732
Share-based compensation (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

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