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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Statement of Income and Comprehensive Income [Abstract] |  |  |
Net (Loss) Earnings | $ 9,899 us-gaap_NetIncomeLoss | $ 13,779 us-gaap_NetIncomeLoss | $ 41,413 us-gaap_NetIncomeLoss
Change in pension and post retirement benefits adjustment (net of tax) | (20,552)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities | 11,296 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities | 771 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities
Total | $ (10,653)us-gaap_OtherComprehensiveIncomeLossBeforeTax | $ 25,075 us-gaap_OtherComprehensiveIncomeLossBeforeTax | $ 42,184 us-gaap_OtherComprehensiveIncomeLossBeforeTax

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