Derivative Instruments and Hedging Activities - Balance Sheet Impact (Details) - USD ($) $ in Thousands	Nov. 30, 2021	May 31, 2021
Derivative [Line Items]
Derivative assets	$ 78,610	$ 121,259
Derivative liabilities	615,097	584,989
Derivative asset, notional amount	2,816,570	2,560,618
Derivative liability, notional amount	5,700,634	6,417,898
Interest rate swaps
Derivative [Line Items]
Derivative assets	78,610	121,259
Derivative liabilities	615,097	584,989
Derivative asset, notional amount	2,816,570	2,560,618
Derivative liability, notional amount	$ 5,700,634	$ 6,417,898