Acquisitions - (Pro Forma Information) (Details) - DTS Acquisition - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jul. 03, 2021	Jul. 03, 2021
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma net revenues	$ 80,243	$ 159,164
Pro forma net earnings attributable to VPG stockholders	$ 6,929	$ 12,262
Pro forma basic earnings per share attributable to VPG stockholders (in dollars per share)	$ 0.51	$ 0.90
Pro forma diluted earnings per share attributable to VPG stockholders (in dollars per share)	$ 0.51	$ 0.90

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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