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Operating Segment and Geographic Information - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 28, 2014
Dec. 29, 2013
Dec. 30, 2012
Segment Reporting Information [Line Items]      
Insurance proceeds related to business interruption     8.5fcs_InsuranceProceedsRelatedToBusinessInterruptionClaims
5-Inch Line at Bucheon Wafer Fab Facility      
Segment Reporting Information [Line Items]      
Accelerated depreciation related to planned closure 6.5us-gaap_RestructuringReserveAcceleratedDepreciation
/ us-gaap_RestructuringCostAndReserveAxis
= fcs_FacilityOneMember		    
8-Inch Line at Salt Lake Wafer Fab Facility      
Segment Reporting Information [Line Items]      
Accelerated depreciation related to planned closure   8.7us-gaap_RestructuringReserveAcceleratedDepreciation
/ us-gaap_RestructuringCostAndReserveAxis
= fcs_FacilityTwoMember		  
Xsens Holdings BV      
Segment Reporting Information [Line Items]      
Revenue contributed from the acquisition 11.5us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= fcs_XsensHoldingsBvMember		    
Customer Concentration Risk | Single Customer      
Segment Reporting Information [Line Items]      
Percentage of revenue from one customer 8.00%fcs_EntitywideRevenueMajorCustomersPercentage
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= fcs_SingleCustomerMember		 11.40%fcs_EntitywideRevenueMajorCustomersPercentage
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= fcs_SingleCustomerMember		 11.90%fcs_EntitywideRevenueMajorCustomersPercentage
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= fcs_SingleCustomerMember