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Segment, Customers, and Geographic Information - Net Revenue from External Customers (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014
Revenue from External Customer [Line Items] |  |  |  |
Net revenue | $ 477,598 us-gaap_SalesRevenueNet | $ 204,271 us-gaap_SalesRevenueNet | $ 1,224,044 us-gaap_SalesRevenueNet | $ 632,641 us-gaap_SalesRevenueNet
Mobile Product Applications [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net revenue | 417,401 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = syna_MobileProductApplicationsMember | 150,746 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = syna_MobileProductApplicationsMember | 1,015,443 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = syna_MobileProductApplicationsMember | 447,014 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = syna_MobileProductApplicationsMember
PC Product Applications [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net revenue | $ 60,197 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = syna_PcProductApplicationsMember | $ 53,525 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = syna_PcProductApplicationsMember | $ 208,601 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = syna_PcProductApplicationsMember | $ 185,627 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = syna_PcProductApplicationsMember

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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