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Derivative Instruments and Hedging Activities - Income Statement Impact (Details) - USD ($)
$ in Thousands
3 Months Ended
Aug. 31, 2023
Aug. 31, 2022
Derivative [Line Items]    
Derivative cash settlements interest income (expense) $ 0 $ 0
Derivative forward value gains 162,018 104,372
Derivative gains 189,887 93,587
Interest rate swaps    
Derivative [Line Items]    
Derivative cash settlements interest income (expense) 27,869 (10,785)
Derivative forward value gains 162,018 104,372
Derivative gains $ 189,887 $ 93,587