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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 | 6 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net revenue | $ 463,705 us-gaap_SalesRevenueNet | $ 205,763 us-gaap_SalesRevenueNet | $ 746,446 us-gaap_SalesRevenueNet | $ 428,370 us-gaap_SalesRevenueNet
China [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net revenue | 126,251 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN | 110,570 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN | 274,421 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN | 217,936 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN
Japan [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net revenue | 231,271 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP | 10,386 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP | 237,007 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP | 22,466 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP
United States [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net revenue | 37,475 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 2,070 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 78,227 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 3,772 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
Taiwan [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net revenue | 32,194 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_TW | 34,068 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_TW | 68,430 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_TW | 66,369 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_TW
South Korea [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net revenue | 31,975 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR | 48,669 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR | 78,816 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR | 117,827 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR
Other [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net revenue | $ 4,539 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = syna_OtherForeignCountryMember |  | $ 9,545 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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