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Share-Based Compensation - Balance and Aggregate Intrinsic Value of Stock Units (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 6 Months Ended
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Dec. 31, 2014
Market Stock Units Outstanding [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Stock Unit Awards Outstanding, Balance at June 30, 2014 | 120,330 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = syna_MarketStockUnitsMember
Stock Unit Awards, Granted | 70,300 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = syna_MarketStockUnitsMember
Stock Unit Awards, Performance adjustment | 46,712 syna_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustmentsForPerformanceResultsAttained / us-gaap_AwardTypeAxis = syna_MarketStockUnitsMember
Stock Unit Awards, Delivered | (93,424)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = syna_MarketStockUnitsMember
Stock Unit Awards Outstanding, Balance at December 31, 2014 | 143,918 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = syna_MarketStockUnitsMember
Aggregate Intrinsic Value, Balance at December 31, 2014 | $ 10,333 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding / us-gaap_AwardTypeAxis = syna_MarketStockUnitsMember
Deferred Stock Units Outstanding [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Stock Unit Awards Outstanding, Balance at June 30, 2014 | 1,058,243 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = syna_DeferredStockUnitsMember
Stock Unit Awards, Granted | 312,293 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = syna_DeferredStockUnitsMember
Stock Unit Awards, Delivered | (264,784)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = syna_DeferredStockUnitsMember
Stock Unit Awards, Forfeited | (39,829)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = syna_DeferredStockUnitsMember
Stock Unit Awards Outstanding, Balance at December 31, 2014 | 1,065,923 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = syna_DeferredStockUnitsMember
Aggregate Intrinsic Value, Balance at December 31, 2014 | $ 76,533 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding / us-gaap_AwardTypeAxis = syna_DeferredStockUnitsMember

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- Definition Share based compensation arrangement by share based payment award equity instruments other than options adjustments for performance results attained. + References No definition available. + Details
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Period Type: | duration

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- Definition Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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