Derivative Financial Instruments - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended		1 Months Ended	3 Months Ended							3 Months Ended
	Aug. 25, 2012 DerivativeInstrument	Aug. 25, 2012 DerivativeInstrument	Aug. 27, 2011 FSS	Nov. 30, 2010 Losses On Three Expired Interest Rate Swaps [Member]	Aug. 25, 2012 Treasury rate locks [Member] Derivative	May 05, 2012 Treasury rate locks [Member] Derivative	May 05, 2012 Treasury rate locks [Member] Loss on two expired treasury rate locks [Member]	Aug. 25, 2012 Treasury Rate Lock, One [Member]	May 05, 2012 Treasury Rate Lock, One [Member]	Aug. 25, 2012 Treasury Rate Lock, Two [Member]	May 05, 2012 Treasury Rate Lock, Two [Member]	Nov. 20, 2010 Forward Starting Swap [Member] Derivative	Nov. 20, 2010 Forward Starting Swap, One [Member]	Nov. 20, 2010 Forward Starting Swap, Two [Member]	Nov. 20, 2010 Forward Starting Swap, Three [Member]
Derivative [Line Items]
Number of treasury rate locks	4	4			2	2
Notional amount of cash flow hedges								$ 100,000,000	$ 300,000,000	$ 100,000,000	$ 100,000,000		$ 150,000,000	$ 150,000,000	$ 100,000,000
Expiration date of cash flow hedge agreement	November 1, 2012					April 20, 2012						November 2010
Fixed rates of the hedges based on LIBOR								2.07%	2.09%	1.92%	2.07%		3.15%	3.13%	2.57%
Derivative instrument, variable interest rate years					10 years	10 years
Ineffective portion recognized of forward starting swaps					0	0						0
Senior notes issued during period		500,000,000	500,000,000			500,000,000
Derivative description of terms						The locks were benchmarked based on the 10-year U.S. treasury notes.						The swaps were benchmarked based on the 3-month London InterBank Offered Rate
Losses recognized in OCI upon expiration of swaps				11,700,000			2,800,000
Number of forward starting swaps			3									3
Senior notes debt issuance												500,000,000
Derivative instrument, variable interest rate months of LIBOR												3 months
Net derivative losses recorded in Accumulated other comprehensive loss		8,000,000
Net derivative losses amortized into interest expense		1,900,000	1,400,000
Net derivative loss expected to be reclassified over next 12 months	$ 904,000	$ 904,000