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Stock Option Activity (Detail) - $ / shares
 12 Months Ended
May 31, 2023
May 31, 2022
May 31, 2021
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Options Outstanding, Beginning Balance 3,244,000 2,957,000 4,324,000
Options, Granted 1,704,000 615,000 403,000
Options, Exercised (22,000) (281,000) (1,389,000)
Options, Forfeited (704,000) (47,000) (381,000)
Options Outstanding, Ending Balance 4,222,000 3,244,000 2,957,000
Weighted-Average Exercise Price, Beginning Balance $ 32.13 $ 27.98 $ 27.98
Weighted-Average Exercise Price, Granted 14.68 36.42 34.23
Weighted-Average Exercise Price, Exercised 14.78 22.79 24.38
Weighted-Average Exercise Price, Forfeited 29.81 33.93 28.99
Weighted-Average Exercise Price, Ending Balance 25.56 32.13 27.98
Weighted-Average Grant Date Fair Value, Beginning Balance 7.66 6.98 6.98
Weighted-Average Grant Date Fair Value, Granted 4.61 8.49 7.71
Weighted-Average Grant Date Fair Value, Exercised 4.23 6.29 6.31
Weighted-Average Grant Date Fair Value, Forfeited 7.26 8.02 7.20
Weighted-Average Grant Date Fair Value, Ending Balance $ 6.51 $ 7.66 $ 6.98