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Derivative Financial Instruments and Hedging Activities - Pretax Gains (Losses) Relating to Cash Flow Hedges Reclassified from AOCL into Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2022
Aug. 31, 2021
Aug. 31, 2020
Interest expense      
Derivative Instruments, Gain (Loss) [Line Items]      
Interest rate derivatives $ (6,254) $ 21,262 $ 23,807