Identifiable Intangible and Other Assets (Detail) - Entity [Domain] - USD ($) $ in Thousands	May. 31, 2015	Aug. 31, 2014
Intangible Assets by Major Class [Line Items]
Finite-Lived Intangible Assets, Net, Total	$ 32,479	$ 35,284
Intangible assets not subject to amortization	912	912
Nonqualified savings plan investments	12,666	10,223
Prepaid and other assets	12,063	11,736
Debt issuance costs, net	4,544	7,602
Total Intangible and other assets, net	62,664	65,757
Customer Relationships
Intangible Assets by Major Class [Line Items]
Finite lived intangible assets gross	65,023	65,023
Accumulated amortization	(32,886)	(30,282)
Other Intangible Assets
Intangible Assets by Major Class [Line Items]
Finite lived intangible assets gross	3,426	3,699
Accumulated amortization	$ (3,084)	$ (3,156)