Fair Value Measurement - Schedule of fair value, assets and liabilities measured on recurring basis (Details) - USD ($) $ in Thousands	May 31, 2023	May 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, at fair value	$ 35,494	$ 33,758
Debt securities trading, at fair value	474,875	566,146
Deferred compensation investments	6,660	6,710
Derivative assets	460,762	222,042
Derivative liabilities	115,074	128,282
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities trading, at fair value	0	0
Deferred compensation investments	6,660	6,710
Derivative assets	0	0
Derivative liabilities	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities trading, at fair value	474,875	566,146
Deferred compensation investments	0	0
Derivative assets	460,762	222,042
Derivative liabilities	115,074	128,282
Recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, at fair value	35,494	33,758
Debt securities trading, at fair value	474,875	566,146
Deferred compensation investments	6,660	6,710
Derivative assets	460,762	222,042
Derivative liabilities	115,074	128,282
Recurring basis | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, at fair value	35,494	33,758
Debt securities trading, at fair value	0	0
Deferred compensation investments	6,660	6,710
Derivative assets	0	0
Derivative liabilities	0	0
Recurring basis | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, at fair value	0	0
Debt securities trading, at fair value	474,875	566,146
Deferred compensation investments	0	0
Derivative assets	460,762	222,042
Derivative liabilities	$ 115,074	$ 128,282