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ACQUISITIONS AND DECONSOLIDATION (Details 3) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended 1 Months Ended 12 Months Ended
Dec. 28, 2013
Dec. 28, 2013
Dec. 29, 2012
Dec. 27, 2014
Deconsolidation        
Deconsolidation of subsidiary $ 12,011us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax      
Realized loss on deconsolidation of subsidiary 8,559vmi_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationRealizedGainLossOnDeconsolidationOfSubsidiary      
Maximum        
Deconsolidation        
Ownership interest (as a percent)       50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Delta EMD, Ltd.        
Deconsolidation        
Supplementary contribution to Delta Pension Plan   1,500,000vmi_SupplementaryContributionToDeltaPensionPlan
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= vmi_DeltaEMDLtdMember
   
Deconsolidation of subsidiary   12,011us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= vmi_DeltaEMDLtdMember
   
Loss on deconsolidation (in dollars per share)   $ 0.45vmi_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= vmi_DeltaEMDLtdMember
   
Realized loss on deconsolidation of subsidiary   8,559vmi_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationRealizedGainLossOnDeconsolidationOfSubsidiary
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= vmi_DeltaEMDLtdMember
   
Losses due to remeasurement of remaining investment   3,452vmi_DiscontinuedOperationGainLossOnRemeasurementOfInvestment
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= vmi_DeltaEMDLtdMember
   
Net sales included in Company's Consolidated Statements of Earnings 38,621us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= vmi_DeltaEMDLtdMember
  44,290us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= vmi_DeltaEMDLtdMember
 
Net earnings included in Company's Consolidated Statements of Earnings $ 3,535us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= vmi_DeltaEMDLtdMember
  $ 1,043us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= vmi_DeltaEMDLtdMember
 
Delta EMD, Ltd. | Maximum        
Deconsolidation        
Ownership interest (as a percent) 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= vmi_DeltaEMDLtdMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= vmi_DeltaEMDLtdMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember