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v2.4.1.9

Non-current Other Assets - Additional Information (Detail) (USD $) | 9 Months Ended
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Mar. 31, 2015
Schedule of Available-for-sale Securities [Line Items] |
Proceeds from sales of non-current investments | $ 4,900,000 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
Auction Rate Securities with fair value maturing from 2016 to 2018 | 12,800,000 syna_AuctionRateSecuritiesWithFairValueMaturingWithinSpecifiedPeriod
Auction Rate Securities with fair value having no stated maturity | 2,800,000 syna_AuctionRateSecuritiesWithFairValueHavingNoStatedMaturity
ARS investments, investment grade | 600,000 syna_AuctionRateSecuritiesAtInvestmentGrade
ARS investments, below investment grade | 18,500,000 syna_AuctionRateSecuritiesBelowInvestmentGrade
Minimum [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Maturity period one | 2016
Maximum [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Maturity period one | 2018
Auction Rate Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Proceeds from sales of non-current investments | $ 4,900,000 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember

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- Definition Auction rate securities below investment grade. + References No definition available. + Details
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- Definition Auction rate securities maturing year of specified amount one. + References No definition available. + Details
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- Definition Auction rate securities with fair value having no stated maturity. + References No definition available. + Details
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- Definition Auction rate securities with fair value maturing within specified period. + References No definition available. + Details
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- Definition The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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