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Employee Benefits - Additional Information (Detail) - USD ($) $ in Millions | Mar. 31, 2018 | Mar. 31, 2017
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Compensation And Retirement Disclosure [Abstract] |  |
Number of common stock that would be issued based on year-end common stock closing price | 294,507 |
Discretionary contributions accrued by the Company under voluntary deferred compensation plan under Section 401(k) of the Internal Revenue Code | $ 19.4 | $ 16.8

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- Definition Accrued amount of discretionary contributions, that is estimated and will be made by an employer, to a defined contribution plan as of the balance sheet date. + References No definition available. + Details
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- Definition The estimated number of shares that would be issued based on the year-end common stock closing price in order to settle the Company's discretionary contributions under a defined contribution plan under Section 401(k). + References No definition available. + Details
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