Intangibles and Other Assets, Net - Identifiable Intangible and Other Assets (Detail) - USD ($) $ in Thousands	Feb. 29, 2020	Sep. 01, 2019	Aug. 31, 2019
Intangibles and Other Assets by Major Class [Line Items]
Finite-Lived Intangible Assets, Net, Total	$ 62,688		$ 67,995
Intangible assets not subject to amortization	5,107		5,450
Prepaid and other assets	18,779		15,749
Operating lease ROU assets	34,624	$ 40,400
Nonqualified savings plan investments	31,766		27,967
Revolving notes issuance costs, net	4,095		4,568
Assets held for sale	3,650		3,650
Total Intangible and other assets, net	160,709		125,379
Customer Relationships
Intangibles and Other Assets by Major Class [Line Items]
Finite lived intangible assets gross	89,722		89,722
Accumulated amortization	(52,691)		(48,850)
Other Intangible Assets
Intangibles and Other Assets by Major Class [Line Items]
Finite lived intangible assets gross	33,845		34,031
Accumulated amortization	$ (8,188)		$ (6,908)