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Organization and Summary of Significant Accounting Policies - Schedule of Changes in Goodwill (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 27, 2020	Jun. 29, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Beginning balance	$ 372.8	$ 372.8
Goodwill allocated to sale of product line	(12.0)	0.0
Ending balance	$ 360.8	$ 372.8

X

- Definition

Goodwill allocated to sale of product line.

+ References

No definition available.

+ Details

Name:	syna_GoodwillAllocatedToSaleOfProductLine
Namespace Prefix:	syna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

+ Details

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

X

- References

No definition available.

+ Details

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