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BANK CREDIT ARRANGEMENTS (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 27, 2014
Dec. 28, 2013
Bank Credit Arrangements    
Outstanding amount $ 13,952us-gaap_ShortTermBankLoansAndNotesPayable $ 19,024us-gaap_ShortTermBankLoansAndNotesPayable
Short-term borrowings    
Bank Credit Arrangements    
Total line of credit facility for short-term borrowings 108,554us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_ShortTermDebtTypeAxis
= vmi_ShortTermLineOfCreditMember
 
Outstanding amount 13,058us-gaap_ShortTermBankLoansAndNotesPayable
/ us-gaap_ShortTermDebtTypeAxis
= vmi_ShortTermLineOfCreditMember
 
Unused and available borrowings 95,496us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_ShortTermDebtTypeAxis
= vmi_ShortTermLineOfCreditMember
 
Fees in connection with line of credit 0us-gaap_DebtInstrumentFeeAmount
/ us-gaap_ShortTermDebtTypeAxis
= vmi_ShortTermLineOfCreditMember
 
Weighted average interest rate on short-term borrowings (as a percent) 6.56%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= vmi_ShortTermLineOfCreditMember
8.65%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= vmi_ShortTermLineOfCreditMember
Other short-term bank loans    
Bank Credit Arrangements    
Outstanding amount $ 894us-gaap_ShortTermBankLoansAndNotesPayable
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
$ 880us-gaap_ShortTermBankLoansAndNotesPayable
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember