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Contingency - Additional Information (Detail) $ in Millions	61 Months Ended
	Jun. 25, 2015 USD ($)
Loss Contingency [Abstract]
Revenues from all sales to distributor	$ 3.1

X

- References

No definition available.

+ Details

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

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- Definition

Revenue from Third Party Distributor

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No definition available.

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Name:	vdsi_RevenueFromThirdPartyDistributor
Namespace Prefix:	vdsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration