XML 48 R37.htm IDEA: XBRL DOCUMENT v3.5.0.2

Auction Rate Securities - Additional Information (Detail) $ in Millions	3 Months Ended
	Sep. 30, 2016 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Auction Rate Securities with fair value having no stated maturity	$ 1.5
Maturity period one	2018
Auction Rate Securities Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Auction Rate Securities with fair value maturing in fiscal year 2018	$ 7.1

X

- Definition

Auction rate securities maturing year of specified amount one.

+ References

No definition available.

+ Details

Name:	syna_AuctionRateSecuritiesMaturingYearOfSpecifiedAmountOne
Namespace Prefix:	syna_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Auction rate securities with fair value having no stated maturity.

+ References

No definition available.

+ Details

Name:	syna_AuctionRateSecuritiesWithFairValueHavingNoStatedMaturity
Namespace Prefix:	syna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of available-for-sale debt securities at fair value that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the fair value over several maturity groupings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_AuctionRateSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: