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Credit Facilities and Restricted Cash - Credit Facilities (Details) (USD $)
 3 Months Ended
Mar. 29, 2015
Line of Credit Facility [Line Items]  
Guarantees and letters of credit outstanding $ 49,400,000us-gaap_LettersOfCreditOutstandingAmount
Credit Agreement [Member]  
Line of Credit Facility [Line Items]  
Line of credit facility, expiration date Apr. 01, 2016
Line of credit facility, amount outstanding 0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= feic_CreditAgreementMember
Revolving Credit Facility [Member]  
Line of Credit Facility [Line Items]  
Line of credit facility, current borrowing capacity 100,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Line of credit facility, additional borrowing capacity 50,000,000feic_CreditFacilityAdditionalBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Line of credit facility, maximum borrowing capacity 150,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Credit Agreement Subfacility [Member]  
Line of Credit Facility [Line Items]  
Line of credit facility, current borrowing capacity $ 50,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= feic_CreditFacilitySubfacilityMember