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Retirement Plans (Schedule of Accumulated Other Comprehensive Loss) (detail) (USD $)
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract      
Beginning Balance $ (11,252,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax    
Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Net Of Tax Including Portion Attributable To Noncontrolling Interest Availableforsale Securities 20,552,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities (11,296,000)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities (771,000)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities
Net Current Period Other Comprehensive Gain 20,552,000us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax    
Ending Balance $ (31,804,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (11,252,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax