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Summary of Projected Benefit Obligation, Accumulated Benefit Obligation and Fair Value of Plan Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Compensation And Retirement Disclosure [Abstract]
Projected Benefit Obligation	$ 36,701	$ 33,730	$ 33,370
Accumulated Benefit Obligation	36,701	33,727
Fair Value of Plan Assets	$ 39,009	$ 36,541	$ 33,412

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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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