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Acquisitions - Summary of Provisional Amounts Recorded for Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Jun. 30, 2014
Oct. 01, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Goodwill $ 215,244us-gaap_Goodwill $ 61,030us-gaap_Goodwill  
Renesas SP Drivers Inc [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash     54,705us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasSPDriversIncMember
Short-term deposit     36,614syna_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedShortTermInvestments
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasSPDriversIncMember
Accounts receivable     140,210us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasSPDriversIncMember
Current deferred tax assets     3,295us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsCurrent
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasSPDriversIncMember
Inventory     6,296us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasSPDriversIncMember
Property and equipment     11,674us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasSPDriversIncMember
Acquired intangible assets     240,900us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasSPDriversIncMember
Other assets     4,002us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasSPDriversIncMember
Total identifiable assets acquired     497,696us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasSPDriversIncMember
Accounts payable     66,544us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasSPDriversIncMember
Income taxes payable     32,534syna_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIncomeTaxPayableCurrent
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasSPDriversIncMember
Deferred tax liabilities     56,751syna_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNet
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasSPDriversIncMember
Other accrued liabilities     28,032us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasSPDriversIncMember
Net identifiable assets acquired     313,835us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasSPDriversIncMember
Goodwill     153,715us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasSPDriversIncMember
Net assets acquired     $ 467,550us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= syna_RenesasSPDriversIncMember