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v3.25.1

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 |  |  |

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