Acquisition - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended		1 Months Ended	3 Months Ended
	Dec. 19, 2012	Aug. 31, 2013	Aug. 25, 2012	Dec. 19, 2012 AutoAnything [Member]	Aug. 31, 2013 AutoAnything [Member]	May 04, 2013 AutoAnything [Member]
Business Acquisition [Line Items]
Acquisition of assets and liabilities				$ 150,000,000
Initial cash payment	115,000,000			115,000,000
Holdback payment for working capital true-ups	5,000,000			5,000,000
Repayment of holdback payment for working capital true-ups						1,100,000
Contingent payments, total				30,000,000
Purchase price allocation, goodwill		367,829,000	302,645,000	83,400,000
Purchase price allocation, intangible assets				58,700,000
Contingent consideration adjusted to reflect fair value		200,000		22,700,000	200,000
Decrease in contingent consideration liability		$ 23,300,000			$ 23,300,000