Derivative Instruments - Fair Value Amounts of Derivative Instruments and Gains (Details) - Cash Flow Hedging - Designated as Hedging Instrument - USD ($) $ in Thousands	Aug. 31, 2020	Aug. 31, 2019
Derivative [Line Items]
Derivative Assets	$ 3,644	$ 520
Derivative Liabilities	5,773	3,575
Foreign currency forward contracts | Prepaid expenses and other current assets
Derivative [Line Items]
Derivative Assets	3,644	520
Foreign currency forward contracts | Accounts payable and accrued expenses
Derivative [Line Items]
Derivative Liabilities	93	3,575
Interest rate swap agreement | Prepaid expenses and other current assets
Derivative [Line Items]
Derivative Assets	0	0
Interest rate swap agreement | Other assets
Derivative [Line Items]
Derivative Assets	0	0
Interest rate swap agreement | Accounts payable and accrued expenses
Derivative [Line Items]
Derivative Liabilities	1,861	0
Interest rate swap agreement | Other non-current liabilities
Derivative [Line Items]
Derivative Liabilities	$ 3,819	$ 0