Fair Value Measurement - Schedule of fair value, assets and liabilities measured on recurring basis (Details) - USD ($) $ in Thousands	May 31, 2022	May 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, at fair value	$ 33,758	$ 35,102
Debt securities trading, at fair value	566,146	576,175
Deferred compensation investments	6,710	7,222
Derivative assets	222,042	121,259
Derivative liabilities	128,282	584,989
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	6,710	7,222
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	566,146	576,175
Deferred compensation investments	0	0
Derivative assets	222,042	121,259
Derivative liabilities	128,282	584,989
Recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, at fair value	33,758	35,102
Debt securities trading, at fair value	566,146	576,175
Deferred compensation investments	6,710	7,222
Derivative assets	222,042	121,259
Derivative liabilities	128,282	584,989
Recurring basis | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, at fair value	33,758	35,102
Debt securities trading, at fair value	0	0
Deferred compensation investments	6,710	7,222
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	566,146	576,175
Deferred compensation investments	0	0
Derivative assets	222,042	121,259
Derivative liabilities	$ 128,282	$ 584,989