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Stock-Based Compensation - Summary of Activity for Service-Based Restricted Common Shares (Detail) - Service-Based Restricted Common Shares - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
May 31, 2021
May 31, 2020
May 31, 2019
Restricted Common Shares      
Outstanding, beginning of year 643 811 796
Granted 307 247 339
Vested (146) (395) (229)
Forfeited (27) (20) (95)
Outstanding, end of year 777 643 811
Weighted Average Grant Date Fair Value      
Outstanding, beginning of year $ 41.79 $ 43.25 $ 40.80
Granted 38.99 37.50 43.35
Vested 43.41 42.00 34.63
Forfeited 42.15 44.10 43.83
Outstanding, end of year $ 40.36 $ 41.79 $ 43.25
Weighted Average Remaining Contractual Life (in years)      
Weighted average remaining contractual life of outstanding restricted common shares (in years) 1 year 3 months 29 days 1 year 6 months 18 days 1 year 2 months 15 days
Aggregate intrinsic value      
Aggregate intrinsic value of outstanding restricted common shares $ 51,541 $ 19,230 $ 27,681
Aggregate intrinsic value of restricted common shares vested during the year $ 5,873 $ 15,322 $ 10,388