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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, 2018
May 31, 2017
May 31, 2018
May 31, 2017
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 (231) 3,750 (18,118) (13,764)
Interest Expense | Hedged Item        
Derivative [Line Items]        
Gain (loss) on fair value hedging relationship $ 231 $ (3,750) $ 18,118 $ 13,764