Derivative Financial Instruments and Hedging Activities - Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Details) - USD ($) $ in Thousands	May 31, 2019	Aug. 31, 2018
Derivative [Line Items]
Derivative Assets	$ 281,878	$ 352,029
Derivative Liabilities	308,087	445,755
Designated as Hedging Instrument | Interest rate swap derivatives
Derivative [Line Items]
Derivative Assets	4,479
Derivative Liabilities	713	9,452
Designated as Hedging Instrument | Derivative Liabilities Current [Member] | Interest rate swap derivatives
Derivative [Line Items]
Derivative Liabilities	45	771
Designated as Hedging Instrument | Other Assets [Member] | Interest rate swap derivatives
Derivative [Line Items]
Derivative Assets	4,479	0
Designated as Hedging Instrument | Other Liabilities | Interest rate swap derivatives
Derivative [Line Items]
Derivative Liabilities	$ 668	$ 8,681