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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
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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 |  |  |  |  |  |  |  |  |  |  | $ 463,000,000 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional purchase price consideration |  |  |  |  |  |  |  |  |  |  | 4,800,000 syna_BusinessCombinationContingentAdditionalConsiderationTransferred / us-gaap_BusinessAcquisitionAxis = syna_RenesasSPDriversIncMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the consideration transferred totaled |  |  |  |  |  |  |  |  |  |  | 468,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = syna_RenesasSPDriversIncMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional purchase consideration settled | 48,600,000 us-gaap_BusinessCombinationContingentConsiderationLiability |  |  | 48,600,000 us-gaap_BusinessCombinationContingentConsiderationLiability |  | 5,780,000,000 us-gaap_BusinessCombinationContingentConsiderationLiability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory purchase obligation settled |  |  |  |  |  |  |  |  |  |  |  |  | 115,000,000 us-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 | 500,000 syna_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCurrentDeferredTaxAssets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in goodwill | 300,000 us-gaap_GoodwillPurchaseAccountingAdjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired intangibles amortization | 4,658,000 us-gaap_AmortizationOfIntangibleAssets | 1,500,000 us-gaap_AmortizationOfIntangibleAssets | 262,000 us-gaap_AmortizationOfIntangibleAssets | 9,577,000 us-gaap_AmortizationOfIntangibleAssets | 785,000 us-gaap_AmortizationOfIntangibleAssets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in provision for income taxes |  | 500,000 us-gaap_IncreaseDecreaseInIncomeTaxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  |  |  |  |  |  |  | 240,900,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = syna_RenesasSPDriversIncMember |  |  |  |  | 143,600,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = syna_RenesasSPDriversIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | 44,600,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = syna_RenesasSPDriversIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 22,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = syna_RenesasSPDriversIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = syna_SupplierArrangementMember | 10,300,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = syna_RenesasSPDriversIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember | 20,400,000 us-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 | 477,598,000 us-gaap_SalesRevenueNet |  | 204,271,000 us-gaap_SalesRevenueNet | 1,224,044,000 us-gaap_SalesRevenueNet | 632,641,000 us-gaap_SalesRevenueNet |  |  |  |  |  |  |  |  | 475,300,000 us-gaap_SalesRevenueNet / us-gaap_BusinessAcquisitionAxis = syna_RenesasSPDriversIncMember |  |  |  |  |  |  |  |  |  |  |  |
Operating income | $ 51,853,000 us-gaap_OperatingIncomeLoss |  | $ (36,143,000)us-gaap_OperatingIncomeLoss | $ 118,100,000 us-gaap_OperatingIncomeLoss | $ 33,128,000 us-gaap_OperatingIncomeLoss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 + Details
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- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to intangibles acquired in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1500-128463 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition 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. + References No definition available. + Details
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- Definition Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521 + Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e961-128460 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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