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Equity Compensation Plans - Additional Information (Detail) - USD ($)
12 Months Ended
May 31, 2023
May 31, 2022
May 31, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Number of shares available for grant 2,871,000 5,386,000 6,355,000
Options Exercisable, Weighted Average Exercise Price $ 31.54 $ 30.24 $ 28.10
Compensation expense related to share based awards $ 10,177,000 $ 7,154,000 $ 6,437,000
Remaining compensation cost to be expensed in future periods for non-vested options $ 11,729,000    
Weighted average expense recognition period 2 years 4 months 24 days    
Weighted average grant date fair value $ 13.83 $ 37.28 $ 34.21
Number of shares purchased by employees 94,604 43,456 38,406
Restricted Stock Units (RSUs)      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Weighted average expense recognition period 2 years 8 months 12 days    
Restricted stock units vested- fair value $ 820,000 $ 1,032,000 $ 0
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount $ 10,839,000    
Employee Stock Purchase Plan | 2011 Employee Stock Purchase Plan      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Number of shares available for grant 881,323    
Number of shares authorized for grant 1,000,000    
Annual maximum limit percentage of compensation to purchase shares 5.00%    
Employee stock purchase plan stock price percentage 10.00%    
Minimum      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Stock option vesting period 3 years    
Stock option contractual terms 5 years    
Minimum | 2018 Omnibus Incentive Plan | Restricted Stock Units (RSUs)      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Stock option vesting period 3 years    
Average      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Stock option contractual terms 7 years    
Maximum      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Stock option vesting period 5 years    
Stock option contractual terms 10 years    
Maximum | 2018 Omnibus Incentive Plan | Restricted Stock Units (RSUs)      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Stock option vesting period 5 years