Goodwill and Other Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	May 26, 2018	Aug. 26, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 253,406	$ 242,960
Accumulated Amortization	180,931	171,216
Net Carrying Amount	72,475	71,744
Customer contracts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	218,523	208,711
Accumulated Amortization	149,859	141,226
Net Carrying Amount	68,664	67,485
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	34,883	34,249
Accumulated Amortization	31,072	29,990
Net Carrying Amount	$ 3,811	$ 4,259