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Components of Net Periodic Cost (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Compensation And Retirement Disclosure [Abstract]        
Service Cost - Benefits Earned During the Period $ 85 $ 100 $ 255 $ 300
Interest Cost of Projected Benefit Obligation 338 337 1,013 1,011
Expected Return on Plan Assets (426) (463) (1,279) (1,389)
Recognized Net Actuarial Loss 43 58 131 174
Amortization of Prior-Service Cost   15   45
Net Periodic Pension Cost $ 40 $ 47 $ 120 $ 141