Goodwill and Other Intangible Assets - Schedule of Changes in Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2019	Aug. 25, 2018
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 3,885	$ 21,500
Total intangible assets and goodwill acquired	5,073	34,113
Customer contracts
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 1,070	$ 11,707
Weighted average life	10 years	14 years 10 months 24 days
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 118	$ 906
Weighted average life	3 years	6 years 1 month 6 days