Goodwill and Intangibles - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	May 09, 2015	May 10, 2014	May 09, 2015	May 10, 2014
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Amortization expense of intangible assets	$ 2,000,000	$ 2,000,000	$ 6,200,000	$ 4,400,000
Purchase of intangibles			10,000,000	11,112,000
Interamerican Motor Corporation [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Increased intangible assets related to acquisition			7,700,000
Customer Relationships [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Purchase of intangibles			$ 10,000,000