Restricted Cash and Investments (Details) (USD $)				3 Months Ended
	Nov. 28, 2012	Nov. 24, 2012	Aug. 25, 2012	Nov. 24, 2012 Subsequent Event [Member]	Dec. 14, 2012 Subsequent Event [Member]
Restricted Cash and Cash Equivalents		$ 55,200,000	$ 55,300,000
Restricted Cash and Cash Equivalents, Current		46,700,000	45,900,000
Restricted Cash and Cash Equivalents, Noncurrent		8,500,000	9,400,000
Period During Which Funds Must Be Used To Realize Deferral Of Tax Gain Related To Sales Of Stores				180 days
Restricted Cash And Investments Current Like Kind Exchange		34,200,000	80,400,000		48,100,000
Restricted Cash And Investments Current Like Kind Exchange Returned Free of Restriction Upon Expiration of Realization Period	$ 23,300,000