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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	$ 477,598us-gaap_SalesRevenueNet	$ 204,271us-gaap_SalesRevenueNet	$ 1,224,044us-gaap_SalesRevenueNet	$ 632,641us-gaap_SalesRevenueNet
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	227,878us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP	11,346us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP	464,883us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP	33,812us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	112,396us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN	90,038us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN	386,817us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN	307,974us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	71,097us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	29,002us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	153,313us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	33,161us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
Taiwan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	34,766us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_TW	25,711us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_TW	103,196us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_TW	92,080us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_TW
South Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	29,453us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR	46,632us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR	108,269us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR	164,458us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	$ 2,008us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = syna_OtherForeignCountryMember	$ 1,542us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = syna_OtherForeignCountryMember	$ 7,566us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = syna_OtherForeignCountryMember	$ 1,156us-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

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