Goodwill and Intangibles - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Aug. 31, 2013	Aug. 30, 2014	Aug. 31, 2013	Aug. 25, 2012
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Goodwill impairment charge	$ 18,300,000
Purchase of intangible assets		11,112,000	0	0
Amortization expense of intangible assets		7,100,000	2,900,000
Customer Relationship and Technology Assets [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Purchase of intangible assets		30,200,000
AutoAnything [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Goodwill impairment charge	18,300,000
AutoAnything [Member] | Trade Name [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Impairment charge	4,100,000
Accumulated impairment	$ 4,100,000	$ 4,100,000	$ 4,100,000