Identifiable Intangible and Other Assets (Detail) - USD ($) $ in Thousands	May 31, 2016	Aug. 31, 2015
Intangibles and Other Assets by Major Class [Line Items]
Finite-Lived Intangible Assets, Net, Total	$ 29,159	$ 31,496
Intangible assets not subject to amortization	912	912
Prepaid and other assets	15,671	13,111
Nonqualified savings plan investments	15,093	11,815
Debt issuance costs, net	6,079	3,823
Assets held for sale	4,108	4,397
Total Intangible and other assets, net	71,022	65,554
Customer Relationships
Intangibles and Other Assets by Major Class [Line Items]
Finite lived intangible assets gross	65,023	65,023
Accumulated amortization	(36,395)	(33,828)
Other Intangible Assets
Intangibles and Other Assets by Major Class [Line Items]
Finite lived intangible assets gross	6,288	3,422
Accumulated amortization	$ (5,757)	$ (3,121)