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Components of Net Periodic Cost (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Compensation And Retirement Disclosure [Abstract]    
Service Cost - Benefits Earned During the Period $ 85 $ 100
Interest Cost of Projected Benefit Obligation 338 337
Expected Return on Plan Assets (426) (463)
Recognized Net Actuarial Loss 43 58
Amortization of Prior-Service Cost   15
Net Periodic Pension Cost $ 40 $ 47