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Derivative Instruments (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 29, 2015
Mar. 30, 2014
Dec. 31, 2014
Notional Amount of Derivatives, Total [Abstract]      
Total outstanding derivative contracts $ 334,312invest_DerivativeNotionalAmount   $ 375,499invest_DerivativeNotionalAmount
Foreign currency loss, inclusive of the impact of derivatives (120)feic_GainLossAttributableToForeignExchangeRateFluctuationsInclusiveOfTheImpactOfDerivatives (230)feic_GainLossAttributableToForeignExchangeRateFluctuationsInclusiveOfTheImpactOfDerivatives  
Cash Flow Hedges [Member]      
Notional Amount of Derivatives, Total [Abstract]      
Total outstanding derivative contracts 174,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember		   222,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
Balance Sheet Hedges [Member]      
Notional Amount of Derivatives, Total [Abstract]      
Total outstanding derivative contracts $ 160,312invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= feic_BalanceSheetHedgesMember		   $ 153,499invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= feic_BalanceSheetHedgesMember