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Income Taxes - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Jun. 30, 2014
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective tax rate | 39.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 27.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations |  |  |
Provision for income taxes | $ 7,783,000 us-gaap_IncomeTaxExpenseBenefit | $ 5,215,000 us-gaap_IncomeTaxExpenseBenefit | $ 18,052,000 us-gaap_IncomeTaxExpenseBenefit | $ 17,895,000 us-gaap_IncomeTaxExpenseBenefit |
Gross unrecognized tax benefits | 11,600,000 us-gaap_UnrecognizedTaxBenefits |  | 11,600,000 us-gaap_UnrecognizedTaxBenefits |  | 10,200,000 us-gaap_UnrecognizedTaxBenefits
Gross unrecognized tax benefits increased during the year |  |  | 1,400,000 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 |  |  | $ 116,000 syna_IncreaseInUnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |  |

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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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- Definition Amount 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 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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