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Share-Based Employee Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
May 31, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Aug. 07, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Number of shares available for future grant |  | 3,760,315 |  | 3,760,315 | 3,000,000
Stock option expense |  | $ 1.1 | $ 1.1 |  |
Aggregate intrinsic value for outstanding options |  | 16.7 |  | $ 16.7 |
Total intrinsic value of options exercised |  | 0.1 |  |  |
Restricted stock or unit expense |  | $ 7.1 | $ 2.4 |  |
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 | 100,849 |  |  |  |
Reduced percentage of shares earned in stock options plan |  | 66.70% |  |  |
Stock based compensation plan, description |  |  |  | The performance criteria for the Fiscal 2020 Employee Performance Stock Option Grant is 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, 2020. All stock options will be earned if the return on equity is 20.0% or greater, and the percentage of shares earned will be reduced proportionately to approximately 66.7% if the return on equity is 10.0%. If the Company does not achieve a return on equity of at least 10.0%, all stock options granted will be forfeited. |
Share-based compensation vesting period | 4 years |  |  |  |
Share-based compensation award expiration term | 10 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, 2020 |  |  |
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, 2023 |  |  |
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 | 84,043 |  |  |  |
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 |  | $ 10.8 |  | $ 10.8 |
Weighted-average period of recognition of unrecognized compensation cost |  | 2 years 10 months 24 days |  |  |
Performance Vesting Restricted Stock [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Number of shares available for future grant | 51,112 |  |  |  |
Stock based compensation plan, description |  | The performance criteria 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 award agreement), ranging from 10.0% to 20.0%, for the fiscal year ending March 31, 2020. All restricted shares will be earned if the return on equity is 20.0% or greater, and the percentage of shares earned will be reduced proportionately to approximately 66.7% if the return on equity is 10.0%. If the Company does not achieve a return on equity of at least 10.0%, all awards will 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, 2020 |  |  |
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, 2022 |  |  |
Time Vesting Restricted Stock [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Number of shares available for future grant | 42,591 |  |  |  |
Share-based compensation vesting period | 4 years |  |  |  |
Restricted Stock [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Weighted-average period of recognition of unrecognized compensation cost |  | 2 years 6 months |  |  |
Weighted average grant date fair value, shares awarded |  | $ 91.58 |  |  |
Unrecognized compensation cost |  | $ 19.1 |  | $ 19.1 |

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