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DIVESTITURES - Assets and liabilities (Details) - Valmont SM, Offshore Wind Business [Member] kr in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2022 DKK (kr) | Dec. 25, 2021 USD ($) | Dec. 31, 2022 DKK (kr)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Operating income | $ 2,259 |  | $ 40,192 |
Cash received | 12,570 | kr 90,000 |  |
Impairment of long-lived assets |  |  | $ 27,900 |
Escrow deposit | 4,027 |  |  | kr 28,000
Cash and cash equivalents | 12,420 |  |  |
Receivables, net | 35,407 |  |  |
Inventories | 1,144 |  |  |
Contract assets | 19,127 |  |  |
Prepaid expenses and other assets | 1,852 |  |  |
Net property, plant, and equipment | 12,915 |  |  |
Intangible assets | 5,579 |  |  |
Other assets | 1,103 |  |  |
Total assets | 89,547 |  |  |
Accounts payable | 23,611 |  |  |
Contract liabilities | 34,814 |  |  |
Accrued expenses | 4,737 |  |  |
Deferred income taxes | 1,375 |  |  |
Total liabilities | 64,537 |  |  |
Net assets | $ 25,010 |  |  |

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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount classified as contract assets attributable to disposal group held for sale or disposed of. + References No definition available. + Details
Name: | vmi_DisposalGroupIncludingDiscontinuedOperationContractAssets
Namespace Prefix: | vmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of net assets of disposal group including discontinued operations. + References No definition available. + Details
Name: | vmi_NetAssetsOfDisposalGroupIncludingDiscontinuedOperations
Namespace Prefix: | vmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=vmi_ValmontSmOffshoreWindBusinessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |