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Subsequent Events (Details) (USD $)	3 Months Ended			0 Months Ended	3 Months Ended
Subsequent Events (Details) (USD $)	Nov. 24, 2012	Nov. 26, 2011	Aug. 25, 2012	Dec. 14, 2012 Subsequent Event [Member] NumberOfStores	Nov. 24, 2012 Subsequent Event [Member]
Number Of Stores Sold				126
Restricted Cash And Investments Current Like Kind Exchange	$ 34,200,000		$ 80,400,000	$ 48,100,000
Period During Which Funds Must Be Used To Realize Deferral Of Tax Gain Related To Sales Of Stores					180 days
Net proceeds from sale-leaseback	1,132,000	0		162,400,000
Initial lease term				15 years
Deferred gain on leaseback transactions				$ 73,100,000

The gross proceeds received from the asset(s) sold in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller less the costs incurred in connection with the transaction, such as closing and deferred financing costs.

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