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Indemnifications, Contingencies and Legal Proceedings - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended
	Oct. 31, 2018	Dec. 31, 2018	Jun. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
Contingent consideration liabilities recorded for business combinations		$ 1.9	$ 8.7
Payment for contingent consideration liabilities recorded for business combinations	$ 6.8

X

- Definition

Business combination contingent consideration liability paid.

+ References

No definition available.

+ Details

Name:	syna_BusinessCombinationContingentConsiderationLiabilityPaid
Namespace Prefix:	syna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478

+ Details

Name:	us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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