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Components of Net Periodic Cost (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Compensation And Retirement Disclosure [Abstract]    
Service Cost - Benefits Earned During the Period $ 100 $ 250
Interest Cost of Projected Benefit Obligation 337 396
Expected Return on Plan Assets (463) (401)
Recognized Net Actuarial Loss 58 428
Amortization of Prior-Service Cost 15 90
Net Periodic Pension Cost $ 47 $ 763