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Commitments and Contingencies - Additional Information (Detail)	Sep. 30, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Capital expenditure commitments	$ 3,006,000

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- References

No definition available.

+ Details

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

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- Definition

Commitment on capital expenditure.

+ References

No definition available.

+ Details

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Namespace Prefix:	vicr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant