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Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Number of Options        
Number of Options outstanding, Beginning Balance (in shares) 1,196,311 975,605 799,501  
Number of Options, Granted (in shares) 200,314 310,140 246,222  
Number of Options, Exercised (in shares) (197,350) (75,180) (42,640)  
Number of Options, Forfeited (in shares) (9,166) (9,575) (27,478)  
Number of Options, Expired (in shares) 0 (4,679) 0  
Number of Options outstanding, Ending Balance (in shares) 1,190,109 1,196,311 975,605 799,501
Number of Options, Exercisable (in shares) 713,932      
Number of Options, Vested and Expected to Vest (in shares) 1,176,995      
Weighted- Average Remaining Contract Term (Years)        
Options outstanding, Weighted Average Remaining Contract Term (Years) 7 years 7 years 3 months 18 days 7 years 6 months 7 years 9 months 18 days
Options exercisable, Weighted Average Remaining Contract Term (Years) 5 years 10 months 24 days      
Options vested and expected to vest, Weighted Average Remaining Contract Term (Years) 7 years      
Weighted- Average Exercise Price        
Options outstanding, Weighted Average Exercise Price, Beginning Balance (usd per share) $ 78.83 $ 78.94 $ 72.31  
Weighted Average Exercise Price, Granted (usd per share) 101.04 75.33 97.32  
Weighted Average Exercise Price, Exercised (usd per share) 71.81 65.22 65.71  
Weighted Average Exercise Price, Expired (usd per share) 78.68 80.05 71.26  
Weighted Average Exercise Price, Forfeited (usd per share) 0 85.12 0  
Options outstanding, Weighted Average Exercise Price, Ending Balance (usd per share) 83.74 $ 78.83 $ 78.94 $ 72.31
Options exercisable, Weighted Average Exercise Price (usd per share) 79.70      
Weighted Average Exercise Price, Vested and Expected to Vest (usd per share) $ 83.66      
Aggregate Intrinsic Value        
Options outstanding, Aggregate Intrinsic Value, Beginning Balance $ 12,150 $ 3,605 $ 14,781  
Options exercised, aggregate intrinsic value 6,110 1,561 1,079  
Options forfeited, aggregate intrinsic value 158 39 520  
Options expired, aggregate intrinsic value 0 0 0  
Options outstanding, Aggregate Intrinsic Value, Ending Balance 15,043 $ 12,150 $ 3,605 $ 14,781
Options exercisable, Aggregate Intrinsic Value 11,178      
Options vested and expected to vest, aggregate intrinsic value $ 14,944