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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, 2020
May 31, 2019
May 31, 2018
Restricted Common Shares      
Outstanding, beginning of year 811 796 865
Granted 247 339 176
Vested (395) (229) (205)
Forfeited (20) (95) (40)
Outstanding, end of year 643 811 796
Weighted Average Grant Date Fair Value      
Outstanding, beginning of year $ 43.25 $ 40.80 $ 39.49
Granted 37.50 43.35 47.88
Vested 42.00 34.63 40.96
Forfeited 44.10 43.83 41.58
Outstanding, end of year $ 41.79 $ 43.25 $ 40.80
Weighted Average Remaining Contractual Life (in years)      
Weighted average remaining contractual life of outstanding restricted common shares (in years) 1 year 6 months 18 days 1 year 2 months 15 days 1 year 2 months 15 days
Aggregate intrinsic value      
Aggregate intrinsic value of outstanding restricted common shares $ 19,230 $ 27,681 $ 38,160
Aggregate intrinsic value of restricted common shares vested during the year $ 15,322 $ 10,388 $ 10,330