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LONG-TERM DEBT (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 27, 2014 | Dec. 26, 2015 | Dec. 27, 2014 | Oct. 17, 2014 | Sep. 22, 2014
Long-term debt: |  |  |  |  |
Aggregate principal amount |  | $ 250,200,000 | $ 250,200,000 |  |
Total long-term debt |  | 765,041,000 | 767,835,000 |  |
Less current installments of long-term debt |  | 1,077,000 | 1,181,000 |  |
Long-term debt, excluding current installments |  | $ 763,964,000 | $ 766,654,000 |  |
Repurchase amount through partial tender offer |  |  |  |  | $ 199,800,000
Effective interest rate (as a percent) |  | 1.00% | 1.00% |  |
Minimum aggregate maturities of long-term debt |  |  |  |  |
2016 |  | $ 1,102,000 |  |  |
2017 |  | 893,000 |  |  |
2018 |  | 894,000 |  |  |
2019 |  | 752,000 |  |  |
2020 |  | 250,958,000 |  |  |
5.00% senior unsecured notes due 2044 |  |  |  |  |
Long-term debt: |  |  |  |  |
Aggregate principal amount |  | 250,000,000 | $ 250,000,000 |  | $ 250,000,000
Unamortized premium on senior unsecured notes |  | $ 1,138,000 |  |  |
Redemption price of notes, stated as a percentage of principal amount (as a percent) |  | 100.00% |  |  |
Interest rate on notes (as a percent) |  | 5.00% |  |  | 5.00%
5.25% senior unsecured notes due 2054 |  |  |  |  |
Long-term debt: |  |  |  |  |
Aggregate principal amount |  | $ 250,000,000 | 250,000,000 |  | $ 250,000,000
Unamortized premium on senior unsecured notes |  | $ 3,267,000 |  |  |
Redemption price of notes, stated as a percentage of principal amount (as a percent) |  | 100.00% |  |  |
Interest rate on notes (as a percent) |  | 5.30% |  |  | 5.00%
Unamortized discount on 5.00% and 5.25% senior unsecured notes |  |  |  |  |
Long-term debt: |  |  |  |  |
Unamortized premium on senior unsecured notes |  | $ (4,405,000) | (4,449,000) |  |
6.625% senior unsecured notes due in April 2020 |  |  |  |  |
Long-term debt: |  |  |  |  |
Aggregate principal amount |  | 250,200,000 |  |  | $ 250,200,000
Unamortized premium on senior unsecured notes |  | $ 4,518,000 | 5,429,000 |  |
Unamortized premium recognized as revenue | $ 4,439,000 |  |  |  |
Redemption price of notes, stated as a percentage of principal amount (as a percent) |  | 100.00% |  |  |
Cash prepayment expenses | $ 41,200,000 |  |  |  |
Interest rate on notes (as a percent) |  | 6.60% |  |  | 6.60%
Repurchase amount through partial tender offer |  |  |  |  | $ 199,800,000
Revolving credit agreement |  |  |  |  |
Long-term debt: |  |  |  |  |
Total long-term debt |  | $ 0 | 0 |  |
Previous borrowing capacity |  |  |  | $ 400,000,000 |
Maximum borrowing capacity |  |  |  | $ 600,000,000 |
Increase in borrowing capacity, maximum |  | 200,000,000 |  |  |
Additional borrowing capacity |  | 581,700,000 |  |  |
Standby letters of credit outstanding |  | $ 18,300,000 |  |  |
Revolving credit agreement | Minimum |  |  |  |  |
Long-term debt: |  |  |  |  |
Basis points added to variable rate (as a percent) |  | 0.00% |  |  |
Revolving credit agreement | Maximum |  |  |  |  |
Long-term debt: |  |  |  |  |
Basis points added to variable rate (as a percent) |  | 6250.00% |  |  |
Revolving credit agreement | LIBOR |  |  |  |  |
Long-term debt: |  |  |  |  |
Variable interest rate basis |  | LIBOR (based on a 1, 2, 3 or 6 month interest period, as selected by the Company) |  |  |
Basis points added to variable rate (as a percent) |  | 10000.00% |  |  |
Variable interest rate, base period |  | 1 month |  |  |
Revolving credit agreement | LIBOR | Minimum |  |  |  |  |
Long-term debt: |  |  |  |  |
Basis points added to variable rate (as a percent) |  | 10000.00% |  |  |
Revolving credit agreement | LIBOR | Maximum |  |  |  |  |
Long-term debt: |  |  |  |  |
Basis points added to variable rate (as a percent) |  | 16250.00% |  |  |
Revolving credit agreement | Prime lending rate |  |  |  |  |
Long-term debt: |  |  |  |  |
Variable interest rate basis |  | prime lending rate |  |  |
Revolving credit agreement | Federal Funds rate |  |  |  |  |
Long-term debt: |  |  |  |  |
Variable interest rate basis |  | Federal Funds rate |  |  |
Basis points added to variable rate (as a percent) |  | 5000.00% |  |  |
IDR Bonds |  |  |  |  |
Long-term debt: |  |  |  |  |
Total long-term debt |  | $ 8,500,000 | 8,500,000 |  |
Other notes |  |  |  |  |
Long-term debt: |  |  |  |  |
Total long-term debt |  | 6,228,000 | $ 8,155,000 |  |
Short Term Bank Lines Of Credit |  |  |  |  |
Long-term debt: |  |  |  |  |
Additional borrowing capacity |  | 103,300,000 |  |  |
Balance |  | $ 103,500,000 |  |  |

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- Definition Represents the amount of cost for prepayment of debt. + References No definition available. + Details
Name: | vmi_DebtPrepaymentExpenses
Namespace Prefix: | vmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Label: Maximum borrowing capacity Element ID: us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity Balance Type: credit Data Type: monetary(xbrli:monetaryItemType) Period Type: instant Preferred Label Role: terseLabel --------------------------------------------------------------------- Previous 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 No definition available. + Details
Name: | vmi_LineOfCreditFacilityPreviousBorrowingCapacity
Namespace Prefix: | vmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the unamortized premium on debt that has been recognized as income. + References No definition available. + Details
Name: | vmi_UnamortizedPremiumRecognizedAsRevenue
Namespace Prefix: | vmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=vmi_SeniorUnsecuredNotes5.00PercentDue2044Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=vmi_SeniorUnsecuredNotes5.25PercentDue2054Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=vmi_UnamortizedDiscountOnSeniorUnsecuredNotes5.00PercentAnd5.25PercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=vmi_SeniorUnsecuredNotes6.625PercentDue2020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=vmi_DebtInstrumentVariableRateBasePrimeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=vmi_DebtInstrumentVariableRateBaseFederalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=vmi_IndustrialDevelopmentRevenueBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=vmi_Notes1.75PercentTo3.485PercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=vmi_ShortTermBankLinesOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |