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Equity Compensation Plans and Other Incentive Compensation - Stock Option Activity (Detail) - $ / shares
12 Months Ended
May 31, 2024
May 31, 2023
May 31, 2022
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Options Outstanding, Beginning Balance 4,222,000 3,244,000 2,957,000
Options, Granted 1,949,000 1,704,000 615,000
Options, Exercised (11,000) (22,000) (281,000)
Options, Forfeited (1,224,000) (704,000) (47,000)
Options Outstanding, Ending Balance 4,936,000 4,222,000 3,244,000
Weighted-Average Exercise Price, Beginning Balance $ 25.56 $ 32.13 $ 27.98
Weighted-Average Exercise Price, Granted 15.43 14.68 36.42
Weighted-Average Exercise Price, Exercised 13.61 14.78 22.79
Weighted-Average Exercise Price, Forfeited 30.27 29.81 33.93
Weighted-Average Exercise Price, Ending Balance 20.41 25.56 32.13
Weighted-Average Grant Date Fair Value, Beginning Balance 6.51 7.66 6.98
Weighted-Average Grant Date Fair Value, Granted 5.98 4.61 8.49
Weighted-Average Grant Date Fair Value, Exercised 4.44 4.23 6.29
Weighted-Average Grant Date Fair Value, Forfeited 7.26 7.26 8.02
Weighted-Average Grant Date Fair Value, Ending Balance $ 6.12 $ 6.51 $ 7.66