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Employee Benefit Plans (Projected Benefit Obligations) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Changes in projected benefit obligations      
Projected benefit obligations, beginning of the year $ 102,383us-gaap_DefinedBenefitPlanBenefitObligation $ 90,234us-gaap_DefinedBenefitPlanBenefitObligation  
Service costs 7,646us-gaap_DefinedBenefitPlanServiceCost 8,591us-gaap_DefinedBenefitPlanServiceCost 7,842us-gaap_DefinedBenefitPlanServiceCost
Interest costs 1,970us-gaap_DefinedBenefitPlanInterestCost 1,794us-gaap_DefinedBenefitPlanInterestCost 1,852us-gaap_DefinedBenefitPlanInterestCost
Plan participant contributions 2,914us-gaap_DefinedBenefitPlanContributionsByPlanParticipants 2,726us-gaap_DefinedBenefitPlanContributionsByPlanParticipants  
Actuarial (gains) losses 16,768us-gaap_DefinedBenefitPlanActuarialGainLoss (2,942)us-gaap_DefinedBenefitPlanActuarialGainLoss  
Benefits paid (5,307)us-gaap_DefinedBenefitPlanBenefitsPaid (1,841)us-gaap_DefinedBenefitPlanBenefitsPaid  
Plan amendment related to statutory change (3,936)us-gaap_DefinedBenefitPlanPlanAmendments 0us-gaap_DefinedBenefitPlanPlanAmendments  
Settlement and curtailment (157)us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1 (1,261)us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1  
Administrative expense paid (160)us-gaap_DefinedBenefitPlanAdministrationExpenses (174)us-gaap_DefinedBenefitPlanAdministrationExpenses  
Currency exchange rate changes (8,798)us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation 5,256us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation  
Projected benefit obligations, end of the year $ 113,323us-gaap_DefinedBenefitPlanBenefitObligation $ 102,383us-gaap_DefinedBenefitPlanBenefitObligation $ 90,234us-gaap_DefinedBenefitPlanBenefitObligation