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Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Number of Options        
Number of Options outstanding, Beginning Balance (in shares) 1,190,109 1,196,311 975,605  
Number of Options, Granted (in shares) 266,027 200,314 310,140  
Number of Options, Exercised (in shares) (139,016) (197,350) (75,180)  
Number of Options, Forfeited (in shares) (29,340) (9,166) (9,575)  
Number of Options, Expired (in shares) 0 0 (4,679)  
Number of Options outstanding, Ending Balance (in shares) 1,287,780 1,190,109 1,196,311 975,605
Number of Options, Exercisable (in shares) 818,637      
Number of Options, Vested and Expected to Vest (in shares) 1,269,049      
Weighted- Average Remaining Contract Term (Years)        
Options outstanding, Weighted Average Remaining Contract Term (Years) 6 years 9 months 18 days 7 years 7 years 3 months 18 days 7 years 6 months
Options exercisable, Weighted Average Remaining Contract Term (Years) 5 years 8 months 12 days      
Options vested and expected to vest, Weighted Average Remaining Contract Term (Years) 6 years 9 months 18 days      
Weighted- Average Exercise Price        
Options outstanding, Weighted Average Exercise Price, Beginning Balance (usd per share) $ 83.74 $ 78.83 $ 78.94  
Weighted Average Exercise Price, Granted (usd per share) 101.56 101.04 75.33  
Weighted Average Exercise Price, Exercised (usd per share) 76.66 71.81 65.22  
Weighted Average Exercise Price, Expired (usd per share) 98.38 78.68 80.05  
Weighted Average Exercise Price, Forfeited (usd per share) 0 0 85.12  
Options outstanding, Weighted Average Exercise Price, Ending Balance (usd per share) 87.85 $ 83.74 $ 78.83 $ 78.94
Options exercisable, Weighted Average Exercise Price (usd per share) 83.13      
Weighted Average Exercise Price, Vested and Expected to Vest (usd per share) $ 87.68      
Aggregate Intrinsic Value        
Options outstanding, Aggregate Intrinsic Value, Beginning Balance $ 15,043 $ 12,150 $ 3,605  
Options exercised, aggregate intrinsic value 3,950 6,110 1,561  
Options forfeited, aggregate intrinsic value 115 158 39  
Options expired, aggregate intrinsic value 0 0 0  
Options outstanding, Aggregate Intrinsic Value, Ending Balance 10,472 $ 15,043 $ 12,150 $ 3,605
Options exercisable, Aggregate Intrinsic Value 8,951      
Options vested and expected to vest, aggregate intrinsic value $ 10,455