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Schedule of Other Changes in Plan Assets and Benefit Obligation Recognized (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Pension Plans, Defined Benefit    
Schedule Of Accumulated Benefit Obligations In Excess Of Fair Value Of Plan Assets And Amounts Recognized In Balance Sheet And In Other Comprehensive Income Loss [Line Items]    
Net (gain) loss $ 3,821 $ (343)
Settlement loss 0 0
Amortization of prior service cost   (36)
Recognized actuarial (gain) (1,785) (2,269)
Total recognized in other comprehensive (income) loss, before tax 2,036 (2,648)
Net of tax 1,323 (1,721)
Other Pension Plans, Defined Benefit    
Schedule Of Accumulated Benefit Obligations In Excess Of Fair Value Of Plan Assets And Amounts Recognized In Balance Sheet And In Other Comprehensive Income Loss [Line Items]    
Net (gain) loss (285) (2,592)
Settlement loss 0 0
Amortization of prior service cost 4,346 2,996
Recognized actuarial (gain) 1,138 1,040
Prior service (cost) arising during period   (15,961)
Total recognized in other comprehensive (income) loss, before tax 5,199 (14,517)
Net of tax $ 3,379 $ (9,436)