Goodwill and Intangibles - Schedule of Carrying Amounts of Intangible Assets (Detail) $ in Thousands	3 Months Ended
	Nov. 17, 2018 USD ($)
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Finite Lived, Gross Carrying Amount	$ 30,246
Finite Lived, Accumulated Amortization	(21,419)
Finite Lived, Net Carrying Amount	8,827
Total intangible assets other than goodwill, Net Carrying Amount	8,827
Technology [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Finite Lived, Gross Carrying Amount	870
Finite Lived, Accumulated Amortization	$ (870)
Technology [Member] | Minimum [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Estimated Useful Life	3 years
Technology [Member] | Maximum [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Estimated Useful Life	5 years
Customer Relationships [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Finite Lived, Gross Carrying Amount	$ 29,376
Finite Lived, Accumulated Amortization	(20,549)
Finite Lived, Net Carrying Amount	$ 8,827
Customer Relationships [Member] | Minimum [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Estimated Useful Life	3 years
Customer Relationships [Member] | Maximum [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Estimated Useful Life	10 years