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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
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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 |  |  |  |  |  |  |  |  | $ 463,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember | ¥ 50,600,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency exchange rate (Japanese yen to U.S. dollar) |  |  |  |  |  |  |  |  |  |  |  | 109.4 us-gaap_ForeignCurrencyExchangeRateTranslation1 / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember | 109.4 us-gaap_ForeignCurrencyExchangeRateTranslation1 / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember |  |  |  |  |  |  |  |  |  |  |  |  |
Indemnification hold back |  |  |  |  |  |  |  |  | 66,000,000 syna_BusinessAcquisitionContingentConsideration / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember | 7,250,000,000 syna_BusinessAcquisitionContingentConsideration / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Working capital hold back |  |  |  |  |  |  |  |  |  |  |  | 48,000,000 syna_BusinessAcquisitionContingentConsiderationAtFairValueWorkingCapitalAdjustment / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember | 5,250,000,000 syna_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 |  |  |  |  |  |  |  |  | 10,900,000 syna_BusinessCombinationContingentAdditionalConsiderationTransferred / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the consideration transferred totaled |  |  |  |  |  |  |  |  | 474,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory purchase obligation settled |  |  |  |  |  |  |  |  |  |  |  | 6,296,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember |  |  |  |  |  |  |  | 115,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember / dei_LegalEntityAxis = syna_RenesasElectronicsCorporationMember |  |  |  |  |  |
Intangible assets acquired |  |  |  |  |  |  |  |  |  |  |  | 250,600,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember |  |  | 138,600,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | 60,200,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 21,500,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = syna_SupplierArrangementMember | 19,400,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember | 11,000,000 us-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 | 463,705,000 us-gaap_SalesRevenueNet | 205,763,000 us-gaap_SalesRevenueNet | 746,446,000 us-gaap_SalesRevenueNet | 428,370,000 us-gaap_SalesRevenueNet |  |  |  |  |  |  | 238,600,000 us-gaap_SalesRevenueNet / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income | $ 28,470,000 us-gaap_OperatingIncomeLoss | $ 22,078,000 us-gaap_OperatingIncomeLoss | $ 64,701,000 us-gaap_OperatingIncomeLoss | $ 69,271,000 us-gaap_OperatingIncomeLoss |  |  |  |  |  |  | $ 16,500,000 us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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