Identifiable Intangible and Other Assets (Detail) - USD ($) $ in Thousands	Aug. 31, 2017	Aug. 31, 2016
Intangibles and Other Assets by Major Class [Line Items]
Finite-Lived Intangible Assets, Net, Total	$ 39,709	$ 28,103
Intangible assets not subject to amortization	912	912
Prepaid and other assets	16,914	14,891
Nonqualified savings plan investments	20,974	15,864
Debt issuance costs, net	2,623	3,481
Assets held for sale	4,045	4,108
Total Intangible and other assets, net	85,177	67,359
Customer Relationships
Intangibles and Other Assets by Major Class [Line Items]
Finite lived intangible assets gross	64,521	65,023
Accumulated amortization	(40,153)	(37,251)
Other Intangible Assets
Intangibles and Other Assets by Major Class [Line Items]
Finite lived intangible assets gross	20,207	6,298
Accumulated amortization	$ (4,866)	$ (5,967)