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Components of Net Periodic (Benefit) Cost (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Compensation And Retirement Disclosure [Abstract]        
Service Cost - Benefits Earned During the Period   $ 85   $ 255
Interest Cost of Projected Benefit Obligation $ 304 338 $ 912 1,013
Expected Return on Plan Assets (355) (426) (1,065) (1,279)
Recognized Net Actuarial Loss 34 43 101 131
Net Periodic Pension (Benefit) Cost $ (17) $ 40 $ (52) $ 120