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Income Taxes - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | Jun. 30, 2014
Income Tax [Line Items] |  |  |  |  |
Effective tax rate | 41.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 29.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations |  |  |
Gross unrecognized tax benefits | $ 11,900,000 us-gaap_UnrecognizedTaxBenefits |  | $ 11,900,000 us-gaap_UnrecognizedTaxBenefits |  | $ 10,200,000 us-gaap_UnrecognizedTaxBenefits
Gross unrecognized tax benefits increased during the year |  |  | 1,700,000 us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease |  |
Interest and penalties accrued related to unrecognized tax benefits | 1,100,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |  | 1,100,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |  |
Increase in interest and penalties accrued related to unrecognized tax benefits | 200,000 syna_IncreaseInUnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |  |  |  |
Provision for income taxes | $ 19,407,000 us-gaap_IncomeTaxExpenseBenefit | $ 4,429,000 us-gaap_IncomeTaxExpenseBenefit | $ 38,000,000 us-gaap_IncomeTaxExpenseBenefit | $ 22,324,000 us-gaap_IncomeTaxExpenseBenefit |
Japan [Member] |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |
Effective tax rate | 35.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations / us-gaap_StatementGeographicalAxis = country_JP |  |  |  |
Expected reduction of corporate income tax | 3.29%syna_ExpectedReductionInIncomeTaxRatePercent / us-gaap_StatementGeographicalAxis = country_JP |  |  |  |
Expected national and local effective tax rate percentage | 32.30%syna_ExpectedEffectiveIncomeTaxRateContinuingOperations / us-gaap_StatementGeographicalAxis = country_JP |  |  |  |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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