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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. 28, 2019
Aug. 31, 2018
Derivative [Line Items]    
Derivative Assets $ 262,504 $ 352,029
Derivative Liabilities 216,610 445,755
Designated as Hedging Instrument | Interest rate swap derivatives    
Derivative [Line Items]    
Derivative Assets 377  
Derivative Liabilities 4,733 9,452
Designated as Hedging Instrument | Derivative Liabilities Current [Member] | Interest rate swap derivatives    
Derivative [Line Items]    
Derivative Liabilities 332 771
Designated as Hedging Instrument | Other Assets [Member] | Interest rate swap derivatives    
Derivative [Line Items]    
Derivative Assets 377 0
Designated as Hedging Instrument | Other Liabilities | Interest rate swap derivatives    
Derivative [Line Items]    
Derivative Liabilities $ 4,401 $ 8,681