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Equity Awards - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Aug. 31, 2024
May 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Aug. 03, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Common Stock, Capital Shares Reserved for Future Issuance           1,425,000
Number of shares available for future grant     1,344,678      
Stock option expense     $ 1.2 $ 2.0 $ 3.4  
Aggregate intrinsic value for outstanding options     23.4      
Aggregate intrinsic value for exercisable options     14.2      
Total intrinsic value of options exercised     14.4 18.8 4.4  
Restricted stock or unit expense     $ 17.6 $ 17.9 $ 13.7  
Options granted     5,476 5,558 56,621  
Threshold Performance Level [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Vesting Percentage of Target PSA's     50.00%      
Maximum Performance Level [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Vesting Percentage of Target PSA's     200.00%      
Fiscal 2025 Board of Directors Stock Option Award [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Share-based compensation award expiration term 10 years          
Options granted 1,550          
Fiscal 2025 Board of Directors Restricted Stock Award [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Share-based compensation vesting period 1 year          
Share-based payment award, granted 7,078          
Performance Vesting Stock Options [Member] | Long Term Compensation Plan [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Stock based compensation plan, description     The performance vesting criteria are based on certain levels of average annual return on equity (as defined in the Performance Stock Award Agreements) ranging from 10.0% to 20.0% measured at the end of fiscal 2027 (three-year performance period) as modified by total stockholder return. Performance outcomes (taking into account both criteria) will result in a threshold vesting percentage of 50% of target, and maximum performance will result in a vesting percentage of 200% of target. If the threshold vesting percentage is not achieved, none of the Performance Stock Awards will be earned.      
Performance Vesting Stock Options [Member] | Long Term Compensation Plan [Member] | Minimum [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Percentage of average return on invested capital   10.00%        
Performance Vesting Stock Options [Member] | Long Term Compensation Plan [Member] | Maximum [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Percentage of average return on invested capital   20.00%        
Performance share units [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Allocated share based compensation expense     $ 11.7      
Performance share units [Member] | Fiscal 2025 Stock Awards [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares available for future grant   29,391        
Performance stock options [Member] | Fiscal 2025 Stock Awards [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares available for future grant   1,963        
Fiscal Two Thousand Twenty Five Time Vesting Stock Options [Member] | Long Term Compensation Plan [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares available for future grant     1,963      
Share-based compensation vesting period     3 years      
Fiscal Two Thousand Twenty Five Time Vesting Restricted Stock [Member] | Long Term Compensation Plan [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Share-based compensation vesting period     3 years      
Time Vesting Restricted Stock [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares available for future grant     30,272      
Employee Stock Option            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Weighted-average period of recognition of unrecognized compensation cost     1 year      
Unrecognized compensation expense     $ 1.1      
Restricted Stock [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Weighted-average period of recognition of unrecognized compensation cost     1 year 4 months 24 days      
Unrecognized compensation expense     $ 23.7