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Components of Net Periodic Cost (Detail) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Compensation And Retirement Disclosure [Abstract]        
Service Cost - Benefits Earned During the Period   $ 339 $ 399 $ 710
Interest Cost of Projected Benefit Obligation   1,351 1,347 1,466
Expected Return on Plan Assets   (1,702) (1,853) (2,137)
Recognized Net Actuarial Loss   153 230 566
Amortization of Prior-Service Cost   19 61 269
Settlement $ 600     649
Net Periodic Pension Cost   $ 160 $ 184 $ 1,523