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Stock Option Plans - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 31, 2015 | Jun. 30, 2015 | Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014 | Aug. 07, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares available for future grant |  |  | 4,565,892 |  |  | 3,000,000
Stock option expense |  |  | $ 7.5 | $ 6.2 | $ 5.3 |
Aggregate intrinsic value for outstanding options |  |  | 31.0 |  |  |
Aggregate intrinsic value of exercisable options |  |  | 34.7 |  |  |
Total intrinsic value of options exercised |  |  | 6.7 |  |  |
Restricted stock or unit expense |  |  | $ 9.8 | $ 6.7 | $ 4.8 |
Maximum number of shares available for grant |  |  | 1,439,758 |  |  |
Stock Awards [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares available for future grant |  |  |  |  |  | 1,500,000
Stock Options [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation cost, stock options |  |  | $ 8.1 |  |  |
Weighted-average period of recognition of unrecognized compensation cost |  |  | 2 years 3 months 18 days |  |  |
Stock Options [Member] | Long Term Compensation Plan [Member] | Employee [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of options, granted |  | 268,571 |  |  |  |
Share-based compensation vesting period |  | 3 years |  |  |  |
Share-based compensation award expiration term |  | 10 years |  |  |  |
Stock Options [Member] | Long Term Compensation Plan [Member] | Board of Directors [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of options, granted | 17,051 |  |  |  |  |
Share-based compensation award expiration term | 10 years |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares available for future grant | 15,139 | 93,782 |  |  |  |
Weighted-average period of recognition of unrecognized compensation cost |  |  | 1 year 9 months 18 days |  |  |
Percentage of average return on invested capital |  |  | 82.00% |  |  |
Shares earned |  |  | 79,326 |  |  |
Employee restricted stock award plan description |  |  | The performance criterion for the Fiscal 2016 Employee Restricted Stock Award is based upon the achievement of certain levels of return on equity, ranging from 12.5% to 17.5%, for the fiscal year ended March 31, 2016. All restricted shares will be earned if the return on equity is 17.5% or greater, and the percentage of shares earned will be reduced proportionately to approximately 75% if the return on equity is 12.5%. If the Company does not achieve a return on equity of at least 12.5%, all awards will be forfeited. If the criteria are met, the award may be reduced by the Compensation Committee based on individual performance goals. |  |  |
Reduced percentage of restricted shares |  | 75.00% |  |  |  |
Remaining restrictions of unearned compensation cost |  |  | 400,000 |  |  |
Unrecognized compensation cost |  |  | $ 14.0 |  |  |
Restricted Stock [Member] | Minimum [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation vesting date |  |  | Mar. 31, 2017 |  |  |
Percentage of average return on invested capital |  | 12.50% |  |  |  |
Restricted Stock [Member] | Maximum [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation vesting date |  |  | Mar. 31, 2020 |  |  |
Percentage of average return on invested capital |  | 17.50% |  |  |  |
Restricted Stock [Member] | Board of Directors [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation vesting period |  | 5 years |  |  |  |

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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