Identifiable Intangible and Other Assets (Detail) - USD ($) $ in Thousands	Feb. 28, 2017	Aug. 31, 2016
Intangibles and Other Assets by Major Class [Line Items]
Finite-Lived Intangible Assets, Net, Total	$ 26,963	$ 28,103
Intangible assets not subject to amortization	912	912
Prepaid and other assets	13,200	14,891
Nonqualified savings plan investments	20,056	15,864
Revolving notes issuance costs, net	3,052	3,481
Assets held for sale	4,045	4,108
Total Intangible and other assets, net	68,228	67,359
Customer Relationships
Intangibles and Other Assets by Major Class [Line Items]
Finite lived intangible assets gross	64,521	65,023
Accumulated amortization	(38,456)	(37,251)
Other Intangible Assets
Intangibles and Other Assets by Major Class [Line Items]
Finite lived intangible assets gross	4,976	6,298
Accumulated amortization	$ (4,078)	$ (5,967)