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Retirement Plans (Schedule of Accumulated Other Comprehensive Loss) (detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract      
Beginning Balance $ (31,804)    
Change in pension and post retirement benefits adjustment (net of tax) (3,408) $ 20,552 $ (11,296)
Ending Balance $ (28,396) $ (31,804)