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Summary of Projected Benefit Obligation, Accumulated Benefit Obligation and Fair Value of Plan Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Compensation And Retirement Disclosure [Abstract]
Projected Benefit Obligation	$ 35,844	$ 36,701	$ 33,730
Accumulated Benefit Obligation	35,844	36,701
Fair Value of Plan Assets	$ 37,907	$ 39,009	$ 36,541

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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