v2.4.0.8

Product Warranties, Indemnifications, and Contingencies - Additional Information (Detail)	9 Months Ended
	Mar. 31, 2014
Commitments And Contingencies Disclosure [Abstract]
Minimum warranty period of products	12 months

X

- Definition

Minimum warranty period of products.

+ References

No definition available.

+ Details

Name:	syna_MinimumWarrantyPeriodOfProducts
Namespace Prefix:	syna_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration