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Schedule of Reconciliation of Obligations and Fair Values of Plan Assets (Detail) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Compensation And Retirement Disclosure [Abstract]        
Benefit Obligation at April 1,   $ 33,370 $ 40,589  
Service Cost - Benefits Earned During the Period   399 710 $ 1,001
Interest Cost on Projected Benefit Obligation   1,347 1,466 1,584
Actuarial (Gain) Loss   (306) (4,505)  
Settlement $ (3,900)   (3,857)  
Benefits Paid   (1,080) (1,033)  
Benefit Obligation at March 31, 33,370 33,730 33,370 40,589
Fair Value of Plan Assets at April 1,   33,412 26,410  
Actual Return on Plan Assets   2,169 2,805  
Employer Contributions   2,040 9,087  
Settlement     (3,857)  
Benefits Paid   (1,080) (1,033)  
Fair Value of Plans at March 31, 33,412 36,541 33,412 $ 26,410
Funded Status at March 31, 42 2,811 42  
Other Assets   2,811    
Prepaid and Other Assets 538   538  
Accrued Benefit Liability (496)   (496)  
Accumulated Other Comprehensive Losses - Net Actuarial Loss 5,198 4,346 5,198  
Accumulated Other Comprehensive Losses - Prior Service Cost 80 19 80  
Accumulated Other Comprehensive Losses 5,278 4,365 5,278  
Reclassification to Retained Earnings 978   978  
Tax impact (2,244) (1,049) (2,244)  
Accumulated Other Comprehensive Losses, net of tax $ 4,012 $ 3,316 $ 4,012