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Revenue Recognition - Additional Information (Detail)	6 Months Ended
	Dec. 31, 2017 Time
Revenue Recognition [Abstract]
Stock rotation rights of inventory per year for distributors	2

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- 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

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- References

No definition available.

+ Details

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