Derivative Financial Instruments and Hedging Activities - Schedule of Derivative Instruments, Effect on Earnings (Details) - Designated as Hedging Instrument - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2020	May 31, 2019
Derivative [Line Items]
Gain (loss) on fair value hedging relationship	$ 0	$ 0	$ 0	$ 0
Interest Expense | Interest rate swap derivatives
Derivative [Line Items]
Gain (loss) on fair value hedging relationship	(4,705)	(8,122)	(1,897)	(15,129)
Interest Expense | Hedged Item
Derivative [Line Items]
Gain (loss) on fair value hedging relationship	$ 4,705	$ 8,122	$ 1,897	$ 15,129