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Derivative Financial Instruments and Hedging Activities - Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Details) - USD ($)
$ in Thousands
Feb. 29, 2020
Aug. 31, 2019
Derivative [Line Items]    
Derivative Assets $ 277,875 $ 246,728
Derivative Liabilities 260,795 244,019
Designated as Hedging Instrument | Other Assets [Member] | Interest rate swap derivatives    
Derivative [Line Items]    
Derivative Assets $ 12,649 $ 9,841