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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future grants (in shares) 2,837,222    
Stock options granted (in shares) 266,027 200,314 310,140
Stock-based compensation expense $ 5,869 $ 7,022 $ 6,232
Stock-based compensation expense, net of tax $ 1,161 $ 730 $ 848
Market price per unit of stock award (usd per share) $ 98.62 $ 94.34 $ 66.90
Unrecognized compensation expense associated with non-vested incentive awards outstanding $ 64,214    
Nonvested stock, weighted average remaining contractual term 27 months    
Restricted Stock Units  (RSU)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Market price per unit of stock award (usd per share) $ 94.63    
Stock unit grant during period (in shares) 361,222    
Restricted Shares Restricted Stock Units and Market Share Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 21,867 $ 23,585 $ 20,139
Stock unit grant during period (in shares) 9,972 8,386 1,635
Equity-based compensation expense, tax benefit $ 3,520 $ 4,557 $ 3,746
Management | Nonqualified Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options granted (in shares) 266,027    
Vesting period, in years 3 years    
Management | Restricted Stock Units  (RSU)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Market price per unit of stock award (usd per share) $ 94.63 $ 94.31 $ 70.88
Stock unit grant during period (in shares) 361,222 269,751 345,449
Non Employee Directors | Restricted Stock Units  (RSU)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units granted (in shares) 19,214 21,147 39,792
Market price per unit of stock award (usd per share) $ 76.52 $ 76.83 $ 42.95
Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future grants (in shares) 3,614,500    
Stock Options Issued In Fiscal 2010 | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options expiration period (in years) 10 years