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Fair Value - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013
Fair Value Disclosures [Line Items] |  |  |  |
Transfer amount of assets or liabilities of level one | $ 0 syna_FairValueMeasurementsTransfersIntoOrOutOfLevelOne | $ 0 syna_FairValueMeasurementsTransfersIntoOrOutOfLevelOne | $ 0 syna_FairValueMeasurementsTransfersIntoOrOutOfLevelOne | $ 0 syna_FairValueMeasurementsTransfersIntoOrOutOfLevelOne
Transfer amount of assets or liabilities of level two | 0 syna_FairValueMeasurementsTransfersIntoOrOutOfLevelTwo | 0 syna_FairValueMeasurementsTransfersIntoOrOutOfLevelTwo | 0 syna_FairValueMeasurementsTransfersIntoOrOutOfLevelTwo | 0 syna_FairValueMeasurementsTransfersIntoOrOutOfLevelTwo
Transfer amount of assets or liabilities of level three | 0 syna_FairValueMeasurementsTransfersIntoOrOutOfLevelThree | 0 syna_FairValueMeasurementsTransfersIntoOrOutOfLevelThree | 0 syna_FairValueMeasurementsTransfersIntoOrOutOfLevelThree | 0 syna_FairValueMeasurementsTransfersIntoOrOutOfLevelThree
Validity Sensors, Inc [Member] |  |  |  |
Fair Value Disclosures [Line Items] |  |  |  |
Additional consideration | 130,900,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = syna_ValiditySensorsIncMember |  | 130,900,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = syna_ValiditySensorsIncMember |
Pacinian [Member] |  |  |  |
Fair Value Disclosures [Line Items] |  |  |  |
Additional consideration paid to former stockholders based on sales of products, due | 10,000,000 syna_BusinessCombinationContingentConsiderationArrangementsContingentConsiderationObligationToFormerShareholdersOfAcquiree / us-gaap_BusinessAcquisitionAxis = syna_PacinianMember |  | 10,000,000 syna_BusinessCombinationContingentConsiderationArrangementsContingentConsiderationObligationToFormerShareholdersOfAcquiree / us-gaap_BusinessAcquisitionAxis = syna_PacinianMember |
Prepaid Expenses and Other Current Assets [Member] | Auction Rate Securities [Member] |  |  |  |
Fair Value Disclosures [Line Items] |  |  |  |
Current Portion of Investments | $ 600,000 us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember |  | $ 600,000 us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember |

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- Definition Amount of investments in debt securities classified as available-for-sale, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer. + 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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 + Details
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