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Non-current Investments - ARS Investments (Detail) (Auction Rate Securities [Member], USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Jun. 30, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |
Original Cost Basis | $ 19,100 syna_InvestmentSecuritiesAtOriginalCostBasis | $ 24,000 syna_InvestmentSecuritiesAtOriginalCostBasis
Other-than- temporary Impairment in Retained Earnings | (11,927)syna_CumulativeOtherThanTemporaryImpairmentIncludedInRetainedEarnings | (12,775)syna_CumulativeOtherThanTemporaryImpairmentIncludedInRetainedEarnings
New Cost Basis | 7,173 us-gaap_AvailableForSaleSecuritiesAmortizedCost | 11,225 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Unrealized Gain/(Loss) | 8,105 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax | 8,560 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax
Fair Value | 15,278 us-gaap_AvailableForSaleSecurities | 19,785 us-gaap_AvailableForSaleSecurities
Student Loans [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Original Cost Basis |  | 3,500 syna_InvestmentSecuritiesAtOriginalCostBasis / us-gaap_InvestmentTypeAxis = syna_StudentLoansMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
Other-than- temporary Impairment in Retained Earnings |  | (179)syna_CumulativeOtherThanTemporaryImpairmentIncludedInRetainedEarnings / us-gaap_InvestmentTypeAxis = syna_StudentLoansMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
New Cost Basis |  | 3,321 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = syna_StudentLoansMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
Unrealized Gain/(Loss) |  | (149)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / us-gaap_InvestmentTypeAxis = syna_StudentLoansMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
Fair Value |  | 3,172 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = syna_StudentLoansMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
Credit Linked Notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Original Cost Basis | 13,500 syna_InvestmentSecuritiesAtOriginalCostBasis / us-gaap_InvestmentTypeAxis = syna_CreditLinkedNotesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | 13,500 syna_InvestmentSecuritiesAtOriginalCostBasis / us-gaap_InvestmentTypeAxis = syna_CreditLinkedNotesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
Other-than- temporary Impairment in Retained Earnings | (6,844)syna_CumulativeOtherThanTemporaryImpairmentIncludedInRetainedEarnings / us-gaap_InvestmentTypeAxis = syna_CreditLinkedNotesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | (7,513)syna_CumulativeOtherThanTemporaryImpairmentIncludedInRetainedEarnings / us-gaap_InvestmentTypeAxis = syna_CreditLinkedNotesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
New Cost Basis | 6,656 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = syna_CreditLinkedNotesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | 5,987 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = syna_CreditLinkedNotesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
Unrealized Gain/(Loss) | 5,284 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / us-gaap_InvestmentTypeAxis = syna_CreditLinkedNotesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | 5,891 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / us-gaap_InvestmentTypeAxis = syna_CreditLinkedNotesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
Fair Value | 11,940 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = syna_CreditLinkedNotesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | 11,878 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = syna_CreditLinkedNotesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
Preferred Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Original Cost Basis | 5,000 syna_InvestmentSecuritiesAtOriginalCostBasis / us-gaap_InvestmentTypeAxis = us-gaap_PreferredStockMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | 5,000 syna_InvestmentSecuritiesAtOriginalCostBasis / us-gaap_InvestmentTypeAxis = us-gaap_PreferredStockMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
Other-than- temporary Impairment in Retained Earnings | (5,000)syna_CumulativeOtherThanTemporaryImpairmentIncludedInRetainedEarnings / us-gaap_InvestmentTypeAxis = us-gaap_PreferredStockMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | (5,000)syna_CumulativeOtherThanTemporaryImpairmentIncludedInRetainedEarnings / us-gaap_InvestmentTypeAxis = us-gaap_PreferredStockMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
Unrealized Gain/(Loss) | 2,750 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_PreferredStockMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | 2,750 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_PreferredStockMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
Fair Value | 2,750 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_PreferredStockMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | 2,750 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_PreferredStockMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
Municipals [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Original Cost Basis | 600 syna_InvestmentSecuritiesAtOriginalCostBasis / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | 2,000 syna_InvestmentSecuritiesAtOriginalCostBasis / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
Other-than- temporary Impairment in Retained Earnings | (83)syna_CumulativeOtherThanTemporaryImpairmentIncludedInRetainedEarnings / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | (83)syna_CumulativeOtherThanTemporaryImpairmentIncludedInRetainedEarnings / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
New Cost Basis | 517 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | 1,917 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
Unrealized Gain/(Loss) | 71 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | 68 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
Fair Value | $ 588 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | $ 1,985 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember

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