Derivative Instruments and Hedging Activities - Schedule of derivative notional amount and weighted-average rates (Details) - USD ($) $ in Thousands	May 31, 2026	May 31, 2025
Total interest rate swaps
Derivative [Line Items]
Notional Amount	$ 6,544,183	$ 7,252,235
Weighted- Average Rate Paid	3.03%	3.28%
Weighted- Average Rate Received	3.82%	4.32%
Pay-fixed swaps
Derivative [Line Items]
Notional Amount	$ 5,380,215	$ 5,833,458
Weighted- Average Rate Paid	2.84%	2.84%
Weighted- Average Rate Received	3.83%	4.54%
Receive-fixed swaps
Derivative [Line Items]
Notional Amount	$ 1,163,968	$ 1,418,777
Weighted- Average Rate Paid	3.94%	5.08%
Weighted- Average Rate Received	3.80%	3.39%
Forward pay-fixed swaps
Derivative [Line Items]
Notional Amount	$ 21,350	$ 0
Interest rate swaps
Derivative [Line Items]
Notional Amount	$ 6,565,533	$ 7,252,235