Acquisitions - (Pro Forma Information) (Details) - DTS Acquisition - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma net revenues	$ 80,243	$ 64,907	$ 159,164	$ 139,158
Pro forma net earnings attributable to VPG stockholders	$ 6,741	$ 1,629	$ 13,411	$ 3,658
Pro forma basic earnings per share attributable to VPG stockholders (in dollars per share)	$ 0.50	$ 0.12	$ 0.99	$ 0.27
Pro forma diluted earnings per share attributable to VPG stockholders (in dollars per share)	$ 0.49	$ 0.12	$ 0.98	$ 0.27

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
-Topic 805
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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