Fair Values of Derivative Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2015	Aug. 31, 2014
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 1,330	$ 129
Designated as Hedging Instrument | Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	2,259	1,990
Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts | Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	6	704
Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts | Accounts Receivable, net
Derivatives, Fair Value [Line Items]
Asset Derivatives	1,330	129
Designated as Hedging Instrument | Interest rate swap contracts | Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	2,253	1,286
Not Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts | Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	4	5
Not Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts | Accounts Receivable, net
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 104	$ 71