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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, 2019
May 31, 2018
May 31, 2017
Restricted Common Shares      
Outstanding, beginning of year 796 865 698
Granted 339 176 525
Vested (229) (205) (310)
Forfeited (95) (40) (48)
Outstanding, end of year 811 796 865
Weighted Average Grant Date Fair Value      
Outstanding, beginning of year $ 40.80 $ 39.49 $ 33.69
Granted 43.35 47.88 42.28
Vested 34.63 40.96 31.81
Forfeited 43.83 41.58 38.82
Outstanding, end of year $ 43.25 $ 40.80 $ 39.49
Weighted Average Remaining Contractual Life (in years)      
Weighted average remaining contractual life of outstanding restricted common shares (in years) 1 year 10 months 13 days 1 year 2 months 15 days 1 year 6 months 25 days
Aggregate intrinsic value      
Aggregate intrinsic value of outstanding restricted common shares $ 27,681 $ 38,160 $ 36,298
Aggregate intrinsic value of restricted common shares vested during the year $ 10,388 $ 10,330 $ 12,840