Fair Values of Derivative Instruments (Detail) - USD ($) $ in Thousands	Aug. 31, 2017	Aug. 31, 2016
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 2,341	$ 1,570
Designated as Hedging Instrument | Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	2,886	7,444
Designated as Hedging Instrument | Foreign Exchange Contracts | Accounts Receivable
Derivatives, Fair Value [Line Items]
Asset Derivatives	2,341	1,570
Designated as Hedging Instrument | Foreign Exchange Contracts | Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	1,761	4,287
Designated as Hedging Instrument | Interest rate swap contracts | Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	1,125	3,157
Not Designated as Hedging Instrument | Foreign Exchange Contracts | Accounts Receivable
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 1,473	25
Not Designated as Hedging Instrument | Foreign Exchange Contracts | Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives		$ 22