Derivative Instruments and Hedging Activities (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	3 Months Ended	6 Months Ended
	Feb. 25, 2012	Feb. 26, 2011 Interest Rate Swap [Member]	Feb. 26, 2011 Interest Rate Swap [Member]
Derivative Instruments and Hedging Activities [Abstract]
Notional amount	$ 100,000
Maturity date	Mar. 14, 2011
Fixed interest rate (in hundredths)	3.51%
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification of losses from accumulated other comprehensive income into interest expense		$ 800	$ 1,600