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Contingencies - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended 0 Months Ended
Mar. 30, 2014
Dec. 29, 2013
Oct. 20, 2004
Patent
Jan. 31, 2011
Dec. 31, 2008
Oct. 31, 2006
Mar. 29, 2015
Product
Claim
Patent
Phase
Mar. 31, 2013
Apr. 27, 2012
Patent
May 01, 2012
Patent
Mar. 26, 2013
Loss Contingencies [Line Items]                      
Damages awarded for infringement of the patents   $ 30,000,000us-gaap_LossContingencyDamagesSoughtValue                  
Charge for (release of) litigation 4,400,000us-gaap_LossContingencyAccrualCarryingValuePeriodIncreaseDecrease                    
Product sales value   20,000us-gaap_SalesRevenueGoodsNet                  
Possible losses, minimum             2,500,000us-gaap_LossContingencyRangeOfPossibleLossMinimum        
Possible losses, maximum             18,900,000us-gaap_LossContingencyRangeOfPossibleLossMaximum        
Power Integrations                      
Loss Contingencies [Line Items]                      
Number of outstanding proceedings with power integrations             5us-gaap_LossContingencyPendingClaimsNumber
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember		        
POWI 1                      
Loss Contingencies [Line Items]                      
Number of patents in lawsuit     4us-gaap_LossContingencyPatentsAllegedlyInfringedNumber
/ us-gaap_LitigationCaseAxis
= fcs_PowiOneMember		       4us-gaap_LossContingencyPatentsAllegedlyInfringedNumber
/ us-gaap_LitigationCaseAxis
= fcs_PowiOneMember		        
Number of phases in trial             3fcs_NumberOfPhasesInTrial
/ us-gaap_LitigationCaseAxis
= fcs_PowiOneMember		        
Number of products in violation             33fcs_NumberOfProductsInViolation
/ us-gaap_LitigationCaseAxis
= fcs_PowiOneMember		        
Number of claims in lawsuit             7fcs_NumberOfClaimsInLawsuit
/ us-gaap_LitigationCaseAxis
= fcs_PowiOneMember		        
Damages awarded for infringement of the patents       12,200,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LitigationCaseAxis
= fcs_PowiOneMember		 6,100,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LitigationCaseAxis
= fcs_PowiOneMember		 34,000,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LitigationCaseAxis
= fcs_PowiOneMember		          
Charge for (release of) litigation               12,600,000us-gaap_LossContingencyAccrualCarryingValuePeriodIncreaseDecrease
/ us-gaap_LitigationCaseAxis
= fcs_PowiOneMember		      
POWI 2                      
Loss Contingencies [Line Items]                      
Number of patents in lawsuit             3us-gaap_LossContingencyPatentsAllegedlyInfringedNumber
/ us-gaap_LitigationCaseAxis
= fcs_PowiTwoMember		        
Number of claims in lawsuit             1fcs_NumberOfClaimsInLawsuit
/ us-gaap_LitigationCaseAxis
= fcs_PowiTwoMember		        
POWI 2 | Power Integrations                      
Loss Contingencies [Line Items]                      
Number of patents in lawsuit                 4us-gaap_LossContingencyPatentsAllegedlyInfringedNumber
/ us-gaap_LitigationCaseAxis
= fcs_PowiTwoMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= fcs_PowerIntegrationsMember		    
Number of patents infringed                 2us-gaap_LossContingencyPatentsFoundInfringedNumber
/ us-gaap_LitigationCaseAxis
= fcs_PowiTwoMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= fcs_PowerIntegrationsMember		    
POWI 2 | System General                      
Loss Contingencies [Line Items]                      
Number of patents in lawsuit                 2us-gaap_LossContingencyPatentsAllegedlyInfringedNumber
/ us-gaap_LitigationCaseAxis
= fcs_PowiTwoMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= fcs_SystemGeneralMember		    
Number of patents infringed                 1us-gaap_LossContingencyPatentsFoundInfringedNumber
/ us-gaap_LitigationCaseAxis
= fcs_PowiTwoMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= fcs_SystemGeneralMember		    
POWI 3                      
Loss Contingencies [Line Items]                      
Number of patents in lawsuit             3us-gaap_LossContingencyPatentsAllegedlyInfringedNumber
/ us-gaap_LitigationCaseAxis
= fcs_PowiThreeMember		        
Damages awarded for infringement of the patents             105,000,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LitigationCaseAxis
= fcs_PowiThreeMember		        
Number of patents infringed             2us-gaap_LossContingencyPatentsFoundInfringedNumber
/ us-gaap_LitigationCaseAxis
= fcs_PowiThreeMember		        
Number of company entities included in complaint             2fcs_NumberOfCompanySubsidiariesIncludedInComplaint
/ us-gaap_LitigationCaseAxis
= fcs_PowiThreeMember		        
POWI 4                      
Loss Contingencies [Line Items]                      
Number of company entities included in complaint             4fcs_NumberOfCompanySubsidiariesIncludedInComplaint
/ us-gaap_LitigationCaseAxis
= fcs_PowiFourMember		        
Number of vendors included in lawsuit             7fcs_NumberOfVendorsIncludedInLawsuit
/ us-gaap_LitigationCaseAxis
= fcs_PowiFourMember		        
Assessed damages for infringement of Fairchild patents             17,000,000us-gaap_GainContingencyUnrecordedAmount
/ us-gaap_LitigationCaseAxis
= fcs_PowiFourMember		        
Powi5                      
Loss Contingencies [Line Items]                      
Number of patents in lawsuit                   3us-gaap_LossContingencyPatentsAllegedlyInfringedNumber
/ us-gaap_LitigationCaseAxis
= fcs_PowiFiveMember		  
Powi5 | Power Integrations                      
Loss Contingencies [Line Items]                      
Number of patents in lawsuit                   5us-gaap_LossContingencyPatentsAllegedlyInfringedNumber
/ us-gaap_LitigationCaseAxis
= fcs_PowiFiveMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember		  
Minimum | POWI 1                      
Loss Contingencies [Line Items]                      
Damages awarded for infringement of the patents                     500,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LitigationCaseAxis
= fcs_PowiOneMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum | POWI 1                      
Loss Contingencies [Line Items]                      
Damages awarded for infringement of the patents                     $ 750,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LitigationCaseAxis
= fcs_PowiOneMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember