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Schedule of Reconciliation of Obligations and Fair Values of Plan Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Compensation And Retirement Disclosure [Abstract]      
Benefit Obligation at April 1, $ 42,281 $ 41,791  
Service Cost - Benefits Earned During the Period 1,001 1,039 $ 874
Interest Cost on Projected Benefit Obligation 1,584 1,525 1,278
Amendments 199   800
Actuarial (Gain) Loss (3,531) (1,146)  
Benefits Paid (945) (928)  
Benefit Obligation at March 31, 40,589 42,281 41,791
Fair Value of Plan Assets at April 1, 21,424 22,055  
Actual Return on Plan Assets 2,522 (537)  
Employer Contributions 3,409 834  
Fair Value of Plans at March 31, 26,410 21,424 $ 22,055
Unfunded Status at March 31, (14,179) (20,857)  
Accrued Benefit Liability (14,179) (20,857)  
Accumulated Other Comprehensive Losses - Net Actuarial Loss 11,587 17,746  
Accumulated Other Comprehensive Losses - Prior Service Cost 349 509  
Accumulated Other Comprehensive Losses 11,936 18,255  
Tax impact (4,540) (6,846)  
Accumulated Other Comprehensive Losses, net of tax $ 7,396 $ 11,409