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Business Combinations Business Combinations (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Jan. 02, 2015
Oct. 03, 2014
Aug. 01, 2014
Business Combinations [Abstract]      
Date of acquisition agreement   Aug. 01, 2014  
Cash paid to acquire entity $ 240.1swks_BusinessAcquisitionEstimatedCashtobePaid    
Voting rights acquired     66.00%swks_BusinessAcquisitionPercentofVotingRightstobeAcquired
Noncontrolling interest in joint ventures     34.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Percent to be consolidated 100.00%swks_BusinessAcquisitionPercenttobeConsolidated    
Property, plant, and equipment acquired 7.2us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment    
Consideration transferred 6.9us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred    
Accrued working capital adjustment $ 17.8swks_Businesscombinationaccruedworkingcapitaladjustment