Leases - Additional Information (Detail) (USD $)	12 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2011	Aug. 25, 2012
Leases [Line Items]
Rental expense	$ 246,300,000	$ 229,400,000	$ 213,800,000
Capital lease assets	107,500,000			104,200,000
Capital lease, accumulated amortization	44,800,000			36,400,000
Capital lease obligations	106,200,000			102,300,000
Current portion of capital lease obligations	32,246,000			29,842,000
Deferred rent	96,500,000			86,900,000
Remaining aggregate rental obligation	1,957,222,000
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
Remaining aggregate rental obligation	$ 15,600,000