Fair Values of Derivative Instruments (Detail) - USD ($) $ in Thousands	May. 31, 2015	Aug. 31, 2014
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 1,271	$ 129
Designated as Hedging Instrument | Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	2,702	1,990
Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts | Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	177	704
Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts | Accounts Receivable, net
Derivatives, Fair Value [Line Items]
Asset Derivatives	1,271	129
Designated as Hedging Instrument | Interest rate swap contracts | Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	2,525	1,286
Not Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts | Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives		5
Not Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts | Accounts Receivable, net
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 256	$ 71