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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
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Revenue from External Customer [Line Items]
Net revenue	$ 477,598us-gaap_SalesRevenueNet	$ 204,271us-gaap_SalesRevenueNet	$ 1,224,044us-gaap_SalesRevenueNet	$ 632,641us-gaap_SalesRevenueNet
Mobile Product Applications [Member]
Revenue from External Customer [Line Items]
Net revenue	417,401us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = syna_MobileProductApplicationsMember	150,746us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = syna_MobileProductApplicationsMember	1,015,443us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = syna_MobileProductApplicationsMember	447,014us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = syna_MobileProductApplicationsMember
PC Product Applications [Member]
Revenue from External Customer [Line Items]
Net revenue	$ 60,197us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = syna_PcProductApplicationsMember	$ 53,525us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = syna_PcProductApplicationsMember	$ 208,601us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = syna_PcProductApplicationsMember	$ 185,627us-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

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