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Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Number of Options        
Number of Options outstanding, Beginning Balance (in shares) 799,501 791,582 554,906  
Number of Options, Granted (in shares) 246,222 295,068 284,109  
Number of Options, Exercised (in shares) (42,640) (247,975) (24,826)  
Number of Options, Forfeited (in shares) (27,478) (34,854) (22,607)  
Number of Options, Expired (in shares)   (4,320) 0  
Number of Options outstanding, Ending Balance (in shares) 975,605 799,501 791,582 554,906
Number of Options, Exercisable (in shares) 472,571      
Number of Options, Vested and Expected to Vest (in shares) 960,129      
Weighted- Average Remaining Contract Term (Years)        
Options outstanding, Weighted Average Remaining Contract Term (Years) 7 years 6 months 7 years 9 months 18 days 7 years 9 months 18 days 8 years
Options exercisable, Weighted Average Remaining Contract Term (Years) 6 years 1 month 6 days      
Options vested and expected to vest, Weighted Average Remaining Contract Term (Years) 7 years 4 months 24 days      
Weighted- Average Exercise Price        
Options outstanding, Weighted Average Exercise Price, Beginning Balance (usd per share) $ 72.31 $ 67.55 $ 72.31  
Weighted Average Exercise Price, Granted (usd per share) 97.32 79.62 57.75  
Weighted Average Exercise Price, Exercised (usd per share) 65.71 66.11 57.60  
Weighted Average Exercise Price, Expired (usd per share) 71.26 69.20 72.19  
Weighted Average Exercise Price, Forfeited (usd per share)   80.25 0  
Options outstanding, Weighted Average Exercise Price, Ending Balance (usd per share) 78.94 $ 72.31 $ 67.55 $ 72.31
Options exercisable, Weighted Average Exercise Price (usd per share) 72.71      
Weighted Average Exercise Price, Vested and Expected to Vest (usd per share) $ 78.77      
Aggregate Intrinsic Value        
Options outstanding, Aggregate Intrinsic Value, Beginning Balance $ 14,781 $ 0 $ 1,040  
Options exercised, aggregate intrinsic value 1,079 6,382 383  
Options forfeited, aggregate intrinsic value 520 290 88  
Options expired, aggregate intrinsic value   0 0  
Options outstanding, Aggregate Intrinsic Value, Ending Balance 3,605 $ 14,781 $ 0 $ 1,040
Options exercisable, Aggregate Intrinsic Value 2,250      
Options vested and expected to vest, aggregate intrinsic value $ 3,590