Derivative Instruments - Fair Values of Derivative Instruments (Detail) - USD ($) $ in Thousands	May 31, 2020	Aug. 31, 2019
Designated as Hedging Instrument | Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 17,644	$ 10,692
Designated as Hedging Instrument | Accounts Receivable
Derivatives, Fair Value [Line Items]
Asset Derivatives	147	64
Designated as Hedging Instrument | Foreign Exchange Contracts | Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	768	437
Designated as Hedging Instrument | Foreign Exchange Contracts | Accounts Receivable
Derivatives, Fair Value [Line Items]
Asset Derivatives	147	64
Designated as Hedging Instrument | Interest rate swap contracts | Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	16,876	10,255
Not Designated as Hedging Instrument | Foreign Exchange Contracts | Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 2	$ 587