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SUBSEQUENT EVENTS (Details) - Revolving Credit Agreement - USD ($) | Oct. 18, 2021 | Sep. 25, 2021
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Subsequent Event [Line Items] |  |
Commitments under the credit facility |  | $ 600,000,000
Accordion under the credit facility |  | $ 200,000,000
Subsequent Event |  |
Subsequent Event [Line Items] |  |
Commitments under the credit facility | $ 800,000,000 |
Accordion under the credit facility | 300,000,000 |
Subsequent Event | Minimum |  |
Subsequent Event [Line Items] |  |
Leverage ratio, unrestricted cash deducted from Interest-bearing debt (in excess of $50 million) | 50,000,000 |
Subsequent Event | Maximum |  |
Subsequent Event [Line Items] |  |
Leverage ratio, unrestricted cash deducted from Interest-bearing debt (in excess of $50 million) | $ 500,000,000 |

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- 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=120391452&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Definition Debt Covenant, Leverage Ratio, Unrestricted Cash Deducted from Interest-bearing Debt + References No definition available. + Details
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Balance Type: | debit
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- Definition Line of Credit, Additional Borrowing Capacity + References No definition available. + Details
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Namespace Prefix: | vmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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- Details
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- Details
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- Details
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