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Acquisitions - Additional Information (Detail)
3 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2014
Minimum [Member]
Customer Relationships [Member]
Dec. 31, 2014
Maximum [Member]
Customer Relationships [Member]
Dec. 31, 2014
Maximum [Member]
Supplier Arrangement [Member]
Dec. 31, 2014
Maximum [Member]
Backlog [Member]
Oct. 01, 2014
Renesas SP Drivers Inc [Member]
USD ($)
Oct. 01, 2014
Renesas SP Drivers Inc [Member]
JPY (¥)
Dec. 31, 2014
Renesas SP Drivers Inc [Member]
USD ($)
Oct. 01, 2014
Renesas SP Drivers Inc [Member]
USD ($)
Oct. 01, 2014
Renesas SP Drivers Inc [Member]
JPY (¥)
Dec. 31, 2014
Renesas SP Drivers Inc [Member]
Developed Technology [Member]
Oct. 01, 2014
Renesas SP Drivers Inc [Member]
Developed Technology [Member]
USD ($)
Oct. 01, 2014
Renesas SP Drivers Inc [Member]
Customer Relationships [Member]
USD ($)
Oct. 01, 2014
Renesas SP Drivers Inc [Member]
Supplier Arrangement [Member]
USD ($)
Oct. 01, 2014
Renesas SP Drivers Inc [Member]
In-Process Research and Development [Member]
USD ($)
Oct. 01, 2014
Renesas SP Drivers Inc [Member]
Backlog [Member]
USD ($)
Dec. 31, 2014
Renesas SP Drivers Inc [Member]
Renesas Electronics Corporation [Member]
USD ($)
Dec. 31, 2014
Renesas SP Drivers Inc [Member]
Minimum [Member]
Dec. 31, 2014
Renesas SP Drivers Inc [Member]
Minimum [Member]
Customer Relationships [Member]
Dec. 31, 2014
Renesas SP Drivers Inc [Member]
Maximum [Member]
Dec. 31, 2014
Renesas SP Drivers Inc [Member]
Maximum [Member]
Customer Relationships [Member]
Dec. 31, 2014
Renesas SP Drivers Inc [Member]
Maximum [Member]
Supplier Arrangement [Member]
Dec. 31, 2014
Renesas SP Drivers Inc [Member]
Maximum [Member]
Backlog [Member]
Business Acquisition [Line Items]                                                    
Acquisition closing effective date                     Oct. 01, 2014                              
Initial purchase price of acquisition                 $ 463,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasspdriversincMember
¥ 50,600,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasspdriversincMember
                               
Foreign currency exchange rate (Japanese yen to U.S. dollar)                       109.4us-gaap_ForeignCurrencyExchangeRateTranslation1
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasspdriversincMember
109.4us-gaap_ForeignCurrencyExchangeRateTranslation1
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasspdriversincMember
                         
Indemnification hold back                 66,000,000syna_BusinessAcquisitionContingentConsideration
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasspdriversincMember
7,250,000,000syna_BusinessAcquisitionContingentConsideration
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasspdriversincMember
                               
Working capital hold back                       48,000,000syna_BusinessAcquisitionContingentConsiderationAtFairValueWorkingCapitalAdjustment
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasspdriversincMember
5,250,000,000syna_BusinessAcquisitionContingentConsiderationAtFairValueWorkingCapitalAdjustment
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasspdriversincMember
                         
Outstanding capital stock                       100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasspdriversincMember
100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasspdriversincMember
                         
Additional purchase price consideration                 10,900,000syna_BusinessCombinationContingentAdditionalConsiderationTransferred
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasspdriversincMember
                                 
Fair value of the consideration transferred totaled                 474,000,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasspdriversincMember
                                 
Inventory purchase obligation settled                       6,296,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasspdriversincMember
              115,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasspdriversincMember
/ dei_LegalEntityAxis
= syna_RenesasElectronicsCorporationMember
           
Intangible assets acquired                       250,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasspdriversincMember
    138,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasspdriversincMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
60,200,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasspdriversincMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
21,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasspdriversincMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= syna_SupplierArrangementMember
19,400,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasspdriversincMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember
11,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasspdriversincMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OrderOrProductionBacklogMember
             
Finite lived intangible assets weighted average useful life         2 years 5 years 1 year 1 year           5 years               2 years   3 years 1 year 1 year
Identified intangible assets included discount rates                                         9.00%syna_DiscountRatesAppliedToEstimatedCashFlowsForAllIntangibleAssetsAcquired
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasspdriversincMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
  14.00%syna_DiscountRatesAppliedToEstimatedCashFlowsForAllIntangibleAssetsAcquired
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasspdriversincMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Net revenue 463,705,000us-gaap_SalesRevenueNet 205,763,000us-gaap_SalesRevenueNet 746,446,000us-gaap_SalesRevenueNet 428,370,000us-gaap_SalesRevenueNet             238,600,000us-gaap_SalesRevenueNet
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasspdriversincMember
                             
Operating income $ 28,470,000us-gaap_OperatingIncomeLoss $ 22,078,000us-gaap_OperatingIncomeLoss $ 64,701,000us-gaap_OperatingIncomeLoss $ 69,271,000us-gaap_OperatingIncomeLoss             $ 16,500,000us-gaap_OperatingIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasspdriversincMember