Contingent Liabilites and Commitments (Repurchase Commitments) (Details) (USD $)	12 Months Ended
	Aug. 25, 2012	Aug. 27, 2011
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Repurchase agreement term	18 months
Accrued loss on repurchases	$ 627,000	$ 1,174,000
Obligation to Repurchase from Dealers [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Contingent liability on repurchase agreements	165,400,000	155,500,000
State Obligation to Repurchase [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Contingent liability on repurchase agreements	$ 5,000,000	$ 5,700,000