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Components of Net Periodic Cost (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract]        
Service Cost - Benefits Earned During the Period $ 100 $ 153 $ 300 $ 557
Interest Cost of Projected Benefit Obligation 337 357 1,011 1,110
Expected Return on Plan Assets (463) (578) (1,389) (1,558)
Recognized Net Actuarial Loss 58 46 174 519
Amortization of Prior-Service Cost 15 60 45 210
Net Periodic Pension Cost $ 47 $ 38 $ 141 $ 838