XML 51 R40.htm IDEA: XBRL DOCUMENT v3.7.0.1

Auction Rate Securities - ARS Investments (Parenthetical) (Detail) $ in Millions	Jun. 30, 2016 USD ($)
Investments Debt And Equity Securities [Abstract]
Investment securities accretion	$ 4.4

X

- Definition

Accumulated accretion on investment securities.

+ References

No definition available.

+ Details

Name:	syna_AccumulatedAccretionOnInvestmentSecurities
Namespace Prefix:	syna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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