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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, 2018
May 31, 2017
May 31, 2016
Restricted Common Shares      
Outstanding, beginning of year 865 698 635
Granted 176 525 217
Vested (205) (310) (120)
Forfeited (40) (48) (34)
Outstanding, end of year 796 865 698
Weighted Average Grant Date Fair Value      
Outstanding, beginning of year $ 39.49 $ 33.69 $ 33.65
Granted 47.88 42.28 29.49
Vested 40.96 31.81 24.14
Forfeited 41.58 38.82 34.53
Outstanding, end of year $ 40.80 $ 39.49 $ 33.69
Weighted Average Remaining Contractual Life (in years)      
Weighted average remaining contractual life of outstanding restricted common shares (in years) 1 year 2 months 15 days 1 year 6 months 25 days 1 year 15 days
Aggregate intrinsic value      
Aggregate intrinsic value of outstanding restricted common shares $ 38,160 $ 36,298 $ 26,059
Aggregate intrinsic value of restricted common shares vested during the year $ 10,330 $ 12,840 $ 3,527