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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 | Dec. 31, 2014 | Jun. 30, 2014 | Oct. 01, 2014
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Goodwill | $ 214,443 us-gaap_Goodwill | $ 61,030 us-gaap_Goodwill |
Renesas SP Drivers Inc [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash |  |  | 54,705 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember
Short-term deposit |  |  | 36,614 syna_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedShortTermInvestments / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember
Accounts receivable |  |  | 140,210 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember
Current deferred tax asset |  |  | 2,762 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsCurrent / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember
Inventory |  |  | 6,296 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember
Property and equipment |  |  | 11,674 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember
Acquired intangible assets |  |  | 250,600 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember
Other assets |  |  | 4,002 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember
Total identifiable assets acquired |  |  | 506,863 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember
Accounts payable |  |  | 66,544 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember
Income taxes payable |  |  | 32,534 syna_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIncomeTaxPayableCurrent / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember
Deferred tax liability |  |  | 59,516 syna_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNet / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember
Other accrued liabilities |  |  | 28,032 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember
Net identifiable assets acquired |  |  | 320,237 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember
Goodwill |  |  | 153,413 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember
Net assets acquired |  |  | $ 473,650 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = syna_RenesasspdriversincMember

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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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