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Segment, Customers, and Geographic Information - Net Revenue within Geographic Areas Based on Customers' Locations (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014
Revenues from External Customers and Long-Lived Assets [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
Japan [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net revenue | 227,878 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP | 11,346 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP | 464,883 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP | 33,812 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP
China [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net revenue | 112,396 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN | 90,038 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN | 386,817 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN | 307,974 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN
United States [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net revenue | 71,097 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 29,002 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 153,313 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 33,161 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
Taiwan [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net revenue | 34,766 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_TW | 25,711 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_TW | 103,196 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_TW | 92,080 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_TW
South Korea [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net revenue | 29,453 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR | 46,632 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR | 108,269 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR | 164,458 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR
Other [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net revenue | $ 2,008 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = syna_OtherForeignCountryMember | $ 1,542 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = syna_OtherForeignCountryMember | $ 7,566 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = syna_OtherForeignCountryMember | $ 1,156 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = syna_OtherForeignCountryMember

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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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