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Stock Option Plans - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 31, 2020 | May 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019 | Aug. 07, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares available for future grant |  |  | 3,449,686 |  |  | 3,000,000
Stock option expense |  |  | $ 4.9 | $ 4.5 | $ 3.8 |
Aggregate intrinsic value for outstanding options |  |  | 35.8 |  |  |
Aggregate intrinsic value for exercisable options |  |  | 18.8 |  |  |
Total intrinsic value of options exercised |  |  | 26.4 | 2.2 | 2.1 |
Restricted stock or unit expense |  |  | $ 10.4 | $ 15.3 | $ 11.3 |
Stock Awards [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares available for future grant |  |  |  |  |  | 1,500,000
Performance 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 |  | 96,476 |  |  |  |
Percentage of average return on invested capital |  |  | 20.00% |  |  |
Reduced percentage of shares earned in stock options plan |  |  | 66.70% |  |  |
Shares earned |  |  | 96,476 |  |  |
Stock based compensation plan, description |  |  | The performance criterion for the Fiscal 2021 Employee Performance Stock Option Grant was based upon the achievement of certain levels of return on equity (as defined in the option agreements), ranging from 10.0% to 20.0%, for the fiscal year ending March 31, 2021. All stock options would be earned if the return on equity was 20.0% or greater, and the percentage of shares earned are reduced proportionately to approximately 66.7% if the return on equity was 10.0%. If the Company does not achieve a return on equity of at least 10.0%, all stock options granted would have been forfeited. During fiscal 2021, our adjusted return on equity was approximately 20.0%; therefore, all 96,476 options were earned. |  |  |
Share-based compensation vesting period |  | 4 years |  |  |  |
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% |  |  |  |
Share-based compensation expiration date |  |  | Mar. 31, 2022 |  |  |
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% |  |  |  |
Share-based compensation expiration date |  |  | Mar. 31, 2024 |  |  |
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 |  | 80,396 |  |  |  |
Share-based compensation vesting period |  | 4 years |  |  |  |
Stock Options [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation cost, stock options |  |  | $ 7.0 |  |  |
Weighted-average period of recognition of unrecognized compensation cost |  |  | 2 years 4 months 24 days |  |  |
Stock Options [Member] | Long Term Compensation Plan [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation award expiration term |  | 10 years |  |  |  |
Performance Vesting Restricted Stock [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares available for future grant |  | 82,722 |  |  |  |
Percentage of average return on invested capital |  |  | 20.00% |  |  |
Shares earned |  |  | 82,722 |  |  |
Stock based compensation plan, description |  |  | The performance criterion for the Fiscal 2020 Employee Restricted Stock Performance Award is based upon the achievement of certain levels of return on equity (as defined in the agreement), ranging from 10.0% to 20.0%, for the fiscal year ended March 31, 2021. All restricted shares would be earned if the return on equity was 20.0% or greater, and the percentage of shares earned will be reduced proportionately to approximately 66.7% if the return on equity was 10.0%. If the Company did not achieve a return on equity of at least 10.0%, all awards would have been be forfeited. |  |  |
Share-based compensation vesting period |  | 4 years |  |  |  |
Reduced percentage of restricted shares |  |  | 66.70% |  |  |
Performance Vesting Restricted Stock [Member] | Minimum [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Percentage of average return on invested capital |  | 10.00% |  |  |  |
Share-based compensation vesting date |  |  | Mar. 31, 2022 |  |  |
Performance Vesting Restricted Stock [Member] | Maximum [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Percentage of average return on invested capital |  | 20.00% |  |  |  |
Share-based compensation vesting date |  |  | Mar. 31, 2024 |  |  |
Time Vesting Restricted Stock [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares available for future grant |  | 68,936 |  |  |  |
Share-based compensation vesting period |  | 4 years |  |  |  |
Time Vesting Restricted Stock [Member] | Board of Director [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation vesting period |  | 6 months |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares available for future grant | 26,064 |  | 267,000 |  |  |
Share-based compensation vesting period | 6 months |  |  |  |  |
Weighted-average period of recognition of unrecognized compensation cost |  |  | 2 years 4 months 24 days |  |  |
Unrecognized compensation cost |  |  | $ 12.6 |  |  |
Restricted Stock And Restricted Stock Unit [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares available for future grant |  |  | 1,085,034 |  |  |

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