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Revenue Recognition - Additional Information (Detail)	9 Months Ended
	Mar. 31, 2018 Time
Maximum [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Stock rotation rights of inventory per year for distributors	2

X

- Definition

Stock rotation rights for inventory per year.

+ References

No definition available.

+ Details

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Namespace Prefix:	syna_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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

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

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: