Intangibles and Other Assets, Net - Identifiable Intangible and Other Assets (Detail) - USD ($) $ in Thousands	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017
Intangibles and Other Assets by Major Class [Line Items]
Finite-Lived Intangible Assets, Net, Total		$ 33,809	$ 39,709
Intangible assets not subject to amortization		4,254	912
Prepaid and other assets		14,676	16,914
Nonqualified savings plan investments		24,710	20,974
Revolving notes issuance costs, net		2,209	2,623
Assets held for sale		3,650	4,045
Total Intangible and other assets, net	$ 83,308	83,308	85,177
Customer Relationships
Intangibles and Other Assets by Major Class [Line Items]
Finite lived intangible assets gross		64,521	64,521
Accumulated amortization		(41,847)	(40,153)
Other Intangible Assets
Intangibles and Other Assets by Major Class [Line Items]
Finite lived intangible assets gross		17,155	20,207
Accumulated amortization		$ (6,020)	$ (4,866)