Goodwill and Intangibles - Schedule of Carrying Amounts of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Feb. 09, 2013
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 58,800
Accumulated Amortization	(600)
Net Carrying Amount	58,200
Technology [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Estimated Useful Life	5 years
Gross Carrying Amount	9,800
Accumulated Amortization	(285)
Net Carrying Amount	9,515
Noncompete agreement [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Estimated Useful Life	5 years
Gross Carrying Amount	1,300
Accumulated Amortization	(38)
Net Carrying Amount	1,262
Customer relationships [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Estimated Useful Life	10 years
Gross Carrying Amount	19,000
Accumulated Amortization	(277)
Net Carrying Amount	18,723
Tradename [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	28,700
Net Carrying Amount	$ 28,700
Estimated Useful Life	Indefinite