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Inventories - Additional Information (Detail) $ in Millions	3 Months Ended
	Sep. 30, 2016 USD ($)
Inventory Disclosure [Abstract]
Inventory charges	$ 2.8

X

- Definition

Inventory charges.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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