Intangibles and Other Assets, Net - Identifiable Intangible and Other Assets (Detail) - USD ($) $ in Thousands	Aug. 31, 2018	Aug. 31, 2017
Intangibles and Other Assets by Major Class [Line Items]
Finite-Lived Intangible Assets, Net, Total	$ 38,845	$ 39,709
Intangible assets not subject to amortization	5,115	912
Prepaid and other assets	18,935	16,914
Nonqualified savings plan investments	26,299	20,974
Debt issuance costs, net	1,824	2,623
Assets held for sale	3,650	4,045
Total Intangible and other assets, net	94,668	85,177
Customer Relationships
Intangibles and Other Assets by Major Class [Line Items]
Finite lived intangible assets gross	72,521	64,521
Accumulated amortization	(43,576)	(40,153)
Other Intangible Assets
Intangibles and Other Assets by Major Class [Line Items]
Finite lived intangible assets gross	16,300	20,207
Accumulated amortization	$ (6,400)	$ (4,866)