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Summary of Projected Benefit Obligation, Accumulated Benefit Obligation and Fair Value of Plan Assets (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
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Compensation And Retirement Disclosure [Abstract] |  |  |
Projected Benefit Obligation | $ 33,730 | $ 33,370 | $ 40,589
Accumulated Benefit Obligation | 33,727 | 33,367 |
Fair Value of Plan Assets | $ 36,541 | $ 33,412 | $ 26,410

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