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Non-current Other Assets - ARS Investments (Detail) (Auction Rate Securities [Member], USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | 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 | (11,550)syna_CumulativeOtherThanTemporaryImpairmentIncludedInRetainedEarnings | (12,775)syna_CumulativeOtherThanTemporaryImpairmentIncludedInRetainedEarnings
New Cost Basis | 7,550 us-gaap_AvailableForSaleSecuritiesAmortizedCost | 11,225 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Unrealized Gain/(Loss) | 8,075 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax | 8,560 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax
Fair Value | 15,625 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 | (6,467)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 | 7,033 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) | 5,248 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 | 12,281 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) | 77 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 | $ 594 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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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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