Shareholders' Equity (Details) (USD $) In Thousands, except Share data	12 Months Ended
	Aug. 27, 2011	Aug. 28, 2010	Aug. 29, 2009	Oct. 21, 2011
Purchase of treasury stock, Value	$ 69,279	$ 48,244	$ 1,206
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Dividend declared, per share	$ 0.25
Dividend payable date	Nov. 18, 2011
Dividend record date	Nov. 04, 2011
Dividend payable amount				15,689
Class A Common Stock [Member]
Maximum shares authorized for repurchased	885,000
Purchase of treasury stock, Shares	1,248,000	968,000
Purchase of treasury stock, Value	$ 69,279	$ 48,244
Shares authorized to be repurchased, amount increased				5,000,000
Common stock voting rights, per share	one vote per share	one vote per share
Class A Common Stock [Member] | Associate Stock Purchase Plan [Member]
Treasury stock reissued to fund plan, Shares	53,000	61,000
Class B Common Stock [Member]
Common stock voting rights, per share	ten votes per share	ten votes per share