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Stock-Based Compensation - Summary of Performance Award Activity (Detail) - Performance Award Activity - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
May 31, 2022
May 31, 2021
May 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested [Roll Forward]      
Outstanding, beginning of year 177 158 149
Granted 67 65 67
Vested (65) (3) (24)
Forfeited (19) (43) (34)
Outstanding, end of year 160 177 158
Weighted Average Grant Date Fair Value      
Outstanding, beginning of year $ 39.23 $ 42.45 $ 45.00
Granted 52.22 36.93 38.91
Vested 42.82 47.76 44.91
Forfeited 41.80 46.86 44.91
Outstanding, end of year $ 42.93 $ 39.23 $ 42.45
Weighted Average Remaining Contractual Life (in years)      
Weighted average remaining contractual life of outstanding restricted common shares (in years) 10 months 24 days 1 year 2 months 1 day 1 year 2 months 23 days
Aggregate intrinsic value      
Aggregate intrinsic value of outstanding restricted common shares $ 7,445 $ 11,730 $ 4,721
Aggregate intrinsic value of restricted common shares vested during the year $ 3,994 $ 100 $ 968