Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line of Credit Facility, Accordion Feature, Increase Limit

+ References

No definition available.

+ Details

Name:	vpg_LineofCreditFacilityAccordionFeatureIncreaseLimit
Namespace Prefix:	vpg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=vpg_LIBOROrCDORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
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Balance Type:
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- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
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- Details

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- Details

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Data Type:	na
Balance Type:
Period Type:

- Details

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- Details

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Long-Term Debt (Narrative) (Details) - USD ($)		3 Months Ended
Long-Term Debt (Narrative) (Details) - USD ($)	Mar. 20, 2020	Mar. 28, 2020	Mar. 30, 2019
Debt Instrument [Line Items]
Repayment of long-term debt		$ 33,000	$ 1,155,000
Credit Agreement 2020
Debt Instrument [Line Items]
Line of credit facility, accordion feature, increase limit	$ 25,000,000
Credit Agreement 2020 \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.25%
Credit Agreement 2020 \| LIBOR Or CDOR \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
Fee on unused capacity (percentage)	0.25%
Credit Agreement 2020 \| LIBOR Or CDOR \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	2.75%
Fee on unused capacity (percentage)	0.40%
Revolving Credit Facility \| Credit Agreement 2020
Debt Instrument [Line Items]
Aggregate principal	$ 75,000,000.0
Revolving Credit Facility \| Credit Agreement 2015
Debt Instrument [Line Items]
Repayment of long-term debt	34,000,000
Letter of Credit \| Credit Agreement 2020
Debt Instrument [Line Items]
Aggregate principal	10,000,000.0
U.S. Closing Date Term Facility \| Credit Agreement 2015
Debt Instrument [Line Items]
Repayment of long-term debt	2,000,000
U.S. Delayed Draw Facility \| Credit Agreement 2015
Debt Instrument [Line Items]
Aggregate principal	$ 5,000,000.0