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Acquired Intangibles - Summary of Life, Gross Carrying Value of Acquired Intangible Assets, and Related Accumulated Amortization (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |
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Mar. 31, 2015 | Jun. 30, 2014
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | $ 331,435 us-gaap_FiniteLivedIntangibleAssetsGross | $ 90,535 us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated amortization | (77,078)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (8,424)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Acquired intangibles, net | 254,357 us-gaap_FiniteLivedIntangibleAssetsNet | 82,111 us-gaap_FiniteLivedIntangibleAssetsNet
Display Driver Developed Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life | 5 years |
Intangible assets | 143,600 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = syna_DisplayDriverDevelopedTechnologyMember |
Fingerprint Developed Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | 75,650 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = syna_FingerPrintDevelopedTechnologyMember | 18,650 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = syna_FingerPrintDevelopedTechnologyMember
Thin Touch Developed Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life | 7 years |
Intangible assets | 8,900 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = syna_ThinTouchDevelopedTechnologyMember | 8,900 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = syna_ThinTouchDevelopedTechnologyMember
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | 48,400 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 3,800 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Licensed Technology and Other [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life | 5 years |
Intangible assets | 1,335 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = syna_LicensedTechnologyMember | 1,335 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = syna_LicensedTechnologyMember
Backlog [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | 11,050 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember | 750 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember
Patents [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life | 5 years |
Intangible assets | 100 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember | 100 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember
Supplier Arrangement [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | 22,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = syna_SupplierArrangementMember |
In-Process Research and Development [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | $ 20,400 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember | $ 57,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember
Minimum [Member] | Fingerprint Developed Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life | 2 years |
Minimum [Member] | Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life | 2 years |
Maximum [Member] | Fingerprint Developed Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life | 4 years |
Maximum [Member] | Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life | 5 years |
Maximum [Member] | Backlog [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life | 1 year |
Maximum [Member] | Supplier Arrangement [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life | 1 year |

X
- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + 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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