Derivative Financial Instruments and Hedging Activities - Fair Value of Derivative Instruments Designated as Fair Value Hedges (Details) - USD ($) $ in Thousands	Aug. 31, 2021	Aug. 31, 2020
Derivative [Line Items]
Derivative asset	$ 568,749	$ 358,300
Derivative liability	453,367	412,809
Cash Flow Hedging [Member] \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative asset	11,874	34,052
Derivative liability	$ 1,001	$ 8,821

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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