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Schedule of Reconciliation of Obligations and Fair Values of Plan Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Compensation And Retirement Disclosure [Abstract]      
Benefit Obligation at April 1, $ 33,730 $ 33,370  
Service Cost - Benefits Earned During the Period 339 399 $ 710
Interest Cost on Projected Benefit Obligation 1,351 1,347 1,466
Actuarial (Gain) Loss 2,464 (306)  
Benefits Paid (1,183) (1,080)  
Benefit Obligation at March 31, 36,701 33,730 33,370
Fair Value of Plan Assets at April 1, 36,541 33,412  
Actual Return on Plan Assets 3,651 2,169  
Employer Contributions   2,040  
Benefits Paid (1,183) (1,080)  
Fair Value of Plan Assets at March 31, 39,009 36,541 $ 33,412
Funded Status at March 31, 2,308 2,811  
Other Assets 2,308 2,811  
Accumulated Other Comprehensive Losses - Net Actuarial Loss 4,709 4,346  
Accumulated Other Comprehensive Losses - Prior Service Cost   19  
Accumulated Other Comprehensive Losses 4,709 4,365  
Tax impact (1,149) (1,049)  
Accumulated Other Comprehensive Losses, net of tax $ 3,560 $ 3,316