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Related-Party Activity - Schedule of Amounts Due From (To) Related Parties (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 29, 2015
Related Party Transaction [Line Items]  
Due from (to) related party $ (115)us-gaap_RelatedPartyTransactionDueFromToRelatedParty
Applied Materials [Member]  
Related Party Transaction [Line Items]  
Due from (to) related party 146us-gaap_RelatedPartyTransactionDueFromToRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= feic_AppliedMaterialsMember
Cascade Microtech [Member]  
Related Party Transaction [Line Items]  
Due from (to) related party 8us-gaap_RelatedPartyTransactionDueFromToRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= feic_CascadeMicrotechMember
Oregon Health and Science University [Member]  
Related Party Transaction [Line Items]  
Due from (to) related party 3us-gaap_RelatedPartyTransactionDueFromToRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= feic_OregonHealthAndScienceUniversityMember
TMC BV [Member]  
Related Party Transaction [Line Items]  
Due from (to) related party (311)us-gaap_RelatedPartyTransactionDueFromToRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= feic_TmcBvMember
Electro Scientific Industries [Member]  
Related Party Transaction [Line Items]  
Due from (to) related party $ 39us-gaap_RelatedPartyTransactionDueFromToRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= feic_ElectroScientificIndustriesMember