Derivative Financial Instruments and Hedging Activities - Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location (Details) - Designated as Hedging Instrument - Long-term debt - USD ($) $ in Thousands	Nov. 30, 2019	Aug. 31, 2019
Derivative [Line Items]
Carrying Amount of Hedged Liabilities	$ 331,435	$ 334,389
Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of Hedged Liabilities	$ 33,565	$ 30,611