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Components of Postretirement Benefit Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Beginning of year $ 16,119us-gaap_DefinedBenefitPlanBenefitObligation $ 14,376us-gaap_DefinedBenefitPlanBenefitObligation  
Service cost for benefits earned during the period 827us-gaap_DefinedBenefitPlanServiceCost 726us-gaap_DefinedBenefitPlanServiceCost 622us-gaap_DefinedBenefitPlanServiceCost
Interest cost on accumulated post retirement benefit 720us-gaap_DefinedBenefitPlanInterestCost 564us-gaap_DefinedBenefitPlanInterestCost 554us-gaap_DefinedBenefitPlanInterestCost
Net benefit payments and expense (450)us-gaap_DefinedBenefitPlanBenefitsPaid (263)us-gaap_DefinedBenefitPlanBenefitsPaid  
Actuarial loss 1,338us-gaap_DefinedBenefitPlanActuarialGainLoss 716us-gaap_DefinedBenefitPlanActuarialGainLoss  
Accumulated postretirement benefit obligation 18,554us-gaap_DefinedBenefitPlanBenefitObligation 16,119us-gaap_DefinedBenefitPlanBenefitObligation 14,376us-gaap_DefinedBenefitPlanBenefitObligation
Liabilities:      
Current liabilities 513us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities 397us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities  
Non-currrent liabilities 18,041us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent 15,722us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent  
Total post retirement benefit liability recognized in statement of financial position 18,554us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent 16,119us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent  
Components included in accumulated other comprehensive income (loss):      
Unrecognized net loss (1,817)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (492)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax  
Cumulative net periodic benefit cost (in excess of employer contribution) $ 16,737us-gaap_DefinedBenefitPlanEffectOfPlanAmendmentOnNetPeriodicBenefitCost $ 15,627us-gaap_DefinedBenefitPlanEffectOfPlanAmendmentOnNetPeriodicBenefitCost