Derivative Instruments - Fair Values of Derivative Instruments (Detail) - USD ($) $ in Thousands	Feb. 28, 2021	Aug. 31, 2020
Designated as Hedging Instrument | Accounts Payable and Accrued Liabilities
Derivatives Fair Value [Line Items]
Liability Derivatives	$ 12,885	$ 15,907
Designated as Hedging Instrument | Accounts Receivable
Derivatives Fair Value [Line Items]
Asset Derivatives	6	560
Designated as Hedging Instrument | Foreign Exchange Contracts | Accounts Payable and Accrued Liabilities
Derivatives Fair Value [Line Items]
Liability Derivatives	731	3
Designated as Hedging Instrument | Foreign Exchange Contracts | Accounts Receivable
Derivatives Fair Value [Line Items]
Asset Derivatives	6	560
Designated as Hedging Instrument | Interest rate swap contracts | Accounts Payable and Accrued Liabilities
Derivatives Fair Value [Line Items]
Liability Derivatives	12,154	15,904
Not Designated as Hedging Instrument | Foreign Exchange Contracts | Accounts Payable and Accrued Liabilities
Derivatives Fair Value [Line Items]
Liability Derivatives	$ 18
Not Designated as Hedging Instrument | Foreign Exchange Contracts | Accounts Receivable
Derivatives Fair Value [Line Items]
Asset Derivatives		$ 22