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