Fair Value Measurement - Recurring Fair Value Measurements (Details) - USD ($) $ in Thousands	Aug. 31, 2022	May 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, at fair value	$ 36,359	$ 33,758
Debt securities trading, at fair value	561,972	566,146
Deferred compensation investments	6,514	6,710
Derivative assets	328,285	222,042
Derivative liabilities	130,242	128,282
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, at fair value	36,359	33,758
Debt securities trading, at fair value	0	0
Deferred compensation investments	6,514	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]
Equity securities, at fair value	0	0
Debt securities trading, at fair value	561,972	566,146
Deferred compensation investments	0	0
Derivative assets	328,285	222,042
Derivative liabilities	130,242	128,282
Recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, at fair value	36,359	33,758
Debt securities trading, at fair value	561,972	566,146
Deferred compensation investments	6,514	6,710
Derivative assets	328,285	222,042
Derivative liabilities	130,242	128,282
Recurring basis | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, at fair value	36,359	33,758
Debt securities trading, at fair value	0	0
Deferred compensation investments	6,514	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	561,972	566,146
Deferred compensation investments	0	0
Derivative assets	328,285	222,042
Derivative liabilities	$ 130,242	$ 128,282