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Goodwill and Intangibles - Schedule of Carrying Amounts of Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 25, 2018
Aug. 26, 2017
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Finite Lived, Gross Carrying Amount $ 30,246 $ 61,546
Finite Lived, Accumulated Amortization (20,457) (35,947)
Finite Lived, Net Carrying Amount 9,789 25,599
Total intangible assets other than goodwill, Net Carrying Amount $ 9,789 52,499
Minimum [Member]    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Estimated Useful Life 3 years  
Maximum [Member]    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Estimated Useful Life 10 years  
Technology [Member]    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Finite Lived, Gross Carrying Amount $ 870 10,570
Finite Lived, Accumulated Amortization $ (870) (9,994)
Finite Lived, Net Carrying Amount   $ 576
Technology [Member] | Minimum [Member]    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Estimated Useful Life 3 years 3 years
Technology [Member] | Maximum [Member]    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Estimated Useful Life 5 years 5 years
Noncompete Agreements [Member]    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Estimated Useful Life   5 years
Finite Lived, Gross Carrying Amount   $ 1,300
Finite Lived, Accumulated Amortization   (1,223)
Finite Lived, Net Carrying Amount   77
Customer Relationships [Member]    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Finite Lived, Gross Carrying Amount $ 29,376 49,676
Finite Lived, Accumulated Amortization (19,587) (24,730)
Finite Lived, Net Carrying Amount $ 9,789 $ 24,946
Customer Relationships [Member] | Minimum [Member]    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Estimated Useful Life 3 years 3 years
Customer Relationships [Member] | Maximum [Member]    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Estimated Useful Life 10 years 10 years
Trade Name [Member]    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Non-amortizing intangible asset - Trade name, Net Carrying Amount   $ 26,900