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Stock Award Plans and Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
May 31, 2021
Nov. 30, 2020
May 31, 2020
May 31, 2019
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Aggregate intrinsic value of options exercised in period         $ 46,900 $ 54,900 $ 15,000
Proceeds from the exercise of stock options         $ 9,424 $ 9,075 $ 3,748
Expected dividend yield         0.00%    
Target performance (number of shares) 25,172   30,881        
2015 Stock Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock option conversion description         Each share of stock issued pursuant to a stock option or stock appreciation right counts as one share against the maximum number of shares issuable under the 2015 Plan, while each share of stock issued pursuant to any other type of award counts as 1.8 shares against the maximum number of shares issuable under the 2015 Plan.    
Common Stock, Capital Shares Reserved for Future Issuance         3,033,652    
Employee Stock Option              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock award plans, outstanding stock options expiration period         10 years    
Vesting period         3 years    
Unrecognized stock-based compensation expense         $ 7,900    
Unrecognized stock-based compensation expense, weighted-average recognition period         1 year 9 months 18 days    
Expected dividend yield         0.00%    
Compensation expense period description         The fair value related to these awards is recorded as compensation expense over the period from date of grant to May 2022 and May 2023, respectively    
Restricted Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period     3 years   3 years    
Unrecognized stock-based compensation expense         $ 48,200    
Unrecognized stock-based compensation expense, weighted-average recognition period         1 year 8 months 12 days    
Weighted average grant-date fair value         $ 288.77 [1] $ 254.8 $ 258.6
Fair value of units vested         $ 39,400 $ 27,900 $ 99,300
Target performance (number of shares) [1]         172,000    
Performance and Market-Based Restricted Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized stock-based compensation expense         $ 17,700    
Unrecognized stock-based compensation expense, weighted-average recognition period         1 year 7 months 6 days    
Performance Based Restricted Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period 3 years 2 years          
Performance Based Restricted Stock Units | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Target performance (number of shares)   66,000          
Performance Based Restricted Stock Units Issued in May 2017              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Target performance (number of shares)     62,000 196,580      
Performance Based Restricted Stock Units Issued In May 2021 | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Target performance (number of shares) 42,060            
Market-Based Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Target performance (number of shares) 62,930   61,762        
Employee Stock Purchase Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
ESPP, exercise price as a percentage of its market price         85.00%    
[1] Includes approximately 11,000 performance-based awards granted due to greater than 100% target vesting.