Leases - Additional Information (Detail) (USD $)	12 Months Ended
	Aug. 25, 2012	Aug. 27, 2011	Aug. 28, 2010
Leases [Line Items]
Rental expense	$ 229,400,000	$ 213,800,000	$ 195,600,000
Capital lease assets	104,200,000	86,600,000
Capital lease, accumulated amortization	36,400,000	30,200,000
Capital lease obligations	102,300,000	86,700,000
Current portion of capital lease obligations	29,842,000	25,296,000
Deferred rent	86,900,000	77,600,000
Remaing aggregate rental obligation	1,910,410,000
Sublease in connection with sale of TruckPro business [Member]
Leases [Line Items]
Initial term of subleased properties in connection with sale of TruckPro business	Not less than 20 years
Remaing aggregate rental obligation	$ 17,300,000