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GUARANTOR/NON-GUARANTOR FINANCIAL INFORMATION (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended
Sep. 22, 2014
Dec. 27, 2014
Sep. 27, 2014
Sep. 22, 2014
Dec. 28, 2013
Long-term debt:          
Parent company's percentage ownership of Guarantors   100.00%vmi_SubsidiaryGuarantorsPercentageOwned      
5.00% senior unsecured notes due 2044          
Long-term debt:          
Face amount of debt issued to finance acquisition $ 250,000us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_LongtermDebtTypeAxis
= vmi_SeniorUnsecuredNotes5.00PercentDue2044Member
       
Interest rate on notes (as a percent) 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= vmi_SeniorUnsecuredNotes5.00PercentDue2044Member
5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= vmi_SeniorUnsecuredNotes5.00PercentDue2044Member
  5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= vmi_SeniorUnsecuredNotes5.00PercentDue2044Member
5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= vmi_SeniorUnsecuredNotes5.00PercentDue2044Member
5.25% senior unsecured notes due 2054          
Long-term debt:          
Face amount of debt issued to finance acquisition 250,000us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_LongtermDebtTypeAxis
= vmi_SeniorUnsecuredNotes5.25PercentDue2054Member
       
Interest rate on notes (as a percent) 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= vmi_SeniorUnsecuredNotes5.25PercentDue2054Member
5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= vmi_SeniorUnsecuredNotes5.25PercentDue2054Member
  5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= vmi_SeniorUnsecuredNotes5.25PercentDue2054Member
5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= vmi_SeniorUnsecuredNotes5.25PercentDue2054Member
6.625% senior unsecured notes due in April 2020          
Long-term debt:          
Face amount of debt issued to finance acquisition 250,200us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_LongtermDebtTypeAxis
= vmi_SeniorUnsecuredNotes6.625PercentDue2020Member
       
Interest rate on notes (as a percent) 6.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= vmi_SeniorUnsecuredNotes6.625PercentDue2020Member
6.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= vmi_SeniorUnsecuredNotes6.625PercentDue2020Member
  6.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= vmi_SeniorUnsecuredNotes6.625PercentDue2020Member
6.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= vmi_SeniorUnsecuredNotes6.625PercentDue2020Member
Debt Repurchase Amount $ 199,800us-gaap_DebtInstrumentRepurchaseAmount
/ us-gaap_LongtermDebtTypeAxis
= vmi_SeniorUnsecuredNotes6.625PercentDue2020Member
  $ 199,800us-gaap_DebtInstrumentRepurchaseAmount
/ us-gaap_LongtermDebtTypeAxis
= vmi_SeniorUnsecuredNotes6.625PercentDue2020Member
$ 199,800us-gaap_DebtInstrumentRepurchaseAmount
/ us-gaap_LongtermDebtTypeAxis
= vmi_SeniorUnsecuredNotes6.625PercentDue2020Member