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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