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Acquisitions - Additional Information (Detail)	3 Months Ended			9 Months Ended			9 Months Ended				0 Months Ended		3 Months Ended	9 Months Ended							9 Months Ended
	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Mar. 31, 2014 USD ($)	Mar. 31, 2015 USD ($)	Mar. 31, 2014 USD ($)	Mar. 31, 2015 JPY (¥)	Mar. 31, 2015 Minimum [Member] Customer Relationships [Member]	Mar. 31, 2015 Maximum [Member] Customer Relationships [Member]	Mar. 31, 2015 Maximum [Member] Supplier Arrangement [Member]	Mar. 31, 2015 Maximum [Member] Backlog [Member]	Oct. 01, 2014 Renesas SP Drivers Inc [Member] USD ($)	Oct. 01, 2014 Renesas SP Drivers Inc [Member] JPY (¥)	Dec. 31, 2014 Renesas SP Drivers Inc [Member] USD ($)	Mar. 31, 2015 Renesas SP Drivers Inc [Member] USD ($)	Mar. 31, 2015 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 ($)	Oct. 01, 2014 Renesas SP Drivers Inc [Member] Backlog [Member] USD ($)	Oct. 01, 2014 Renesas SP Drivers Inc [Member] In-Process Research and Development [Member] USD ($)	Mar. 31, 2015 Renesas SP Drivers Inc [Member] Minimum [Member]	Mar. 31, 2015 Renesas SP Drivers Inc [Member] Minimum [Member] Customer Relationships [Member]	Mar. 31, 2015 Renesas SP Drivers Inc [Member] Maximum [Member]	Mar. 31, 2015 Renesas SP Drivers Inc [Member] Maximum [Member] Customer Relationships [Member]	Mar. 31, 2015 Renesas SP Drivers Inc [Member] Maximum [Member] Supplier Arrangement [Member]	Mar. 31, 2015 Renesas SP Drivers Inc [Member] Maximum [Member] Backlog [Member]
Business Acquisition [Line Items]
Acquisition closing effective date														Oct. 01, 2014
Outstanding capital stock											100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = syna_RenesasSPDriversIncMember	100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = syna_RenesasSPDriversIncMember
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
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
Additional purchase price consideration											4,800,000syna_BusinessCombinationContingentAdditionalConsiderationTransferred / us-gaap_BusinessAcquisitionAxis = syna_RenesasSPDriversIncMember
Fair value of the consideration transferred totaled											468,000,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = syna_RenesasSPDriversIncMember
Additional purchase consideration settled	48,600,000us-gaap_BusinessCombinationContingentConsiderationLiability			48,600,000us-gaap_BusinessCombinationContingentConsiderationLiability		5,780,000,000us-gaap_BusinessCombinationContingentConsiderationLiability
Inventory purchase obligation settled													115,000,000us-gaap_LongTermPurchaseCommitmentAmount / us-gaap_BusinessAcquisitionAxis = syna_RenesasSPDriversIncMember
Decrease in intangible assets	(9,700,000)us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles
Decrease in deferred tax liabilities	(2,800,000)syna_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentDeferredTaxLiabilities
Increase in current deferred tax assets	500,000syna_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCurrentDeferredTaxAssets
Increase in goodwill	300,000us-gaap_GoodwillPurchaseAccountingAdjustments
Acquired intangibles amortization	4,658,000us-gaap_AmortizationOfIntangibleAssets	1,500,000us-gaap_AmortizationOfIntangibleAssets	262,000us-gaap_AmortizationOfIntangibleAssets	9,577,000us-gaap_AmortizationOfIntangibleAssets	785,000us-gaap_AmortizationOfIntangibleAssets
Increase in provision for income taxes		500,000us-gaap_IncreaseDecreaseInIncomeTaxes
Intangible assets acquired											240,900,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = syna_RenesasSPDriversIncMember					143,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = syna_RenesasSPDriversIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember	44,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = syna_RenesasSPDriversIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	22,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = syna_RenesasSPDriversIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = syna_SupplierArrangementMember	10,300,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = syna_RenesasSPDriversIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember	20,400,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = syna_RenesasSPDriversIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember
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	477,598,000us-gaap_SalesRevenueNet		204,271,000us-gaap_SalesRevenueNet	1,224,044,000us-gaap_SalesRevenueNet	632,641,000us-gaap_SalesRevenueNet									475,300,000us-gaap_SalesRevenueNet / us-gaap_BusinessAcquisitionAxis = syna_RenesasSPDriversIncMember
Operating income	$ 51,853,000us-gaap_OperatingIncomeLoss		$ (36,143,000)us-gaap_OperatingIncomeLoss	$ 118,100,000us-gaap_OperatingIncomeLoss	$ 33,128,000us-gaap_OperatingIncomeLoss

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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