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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
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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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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