XML 48 R38.htm IDEA: XBRL DOCUMENT
v3.20.2

GOODWILL AND INTANGIBLE ASSETS - Carrying Values of Trade Names - (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 26, 2020 USD ($) | Sep. 26, 2020 USD ($) tradeName | Dec. 28, 2019 USD ($)
Non-amortized intangible assets |  |  |
Number of trade names impaired | tradeName |  | 2 |
Newmark |  |  |
Non-amortized intangible assets |  |  |
Carrying value of trade names | $ 11,111,000 | $ 11,111,000 | $ 11,111,000
Webforge |  |  |
Non-amortized intangible assets |  |  |
Carrying value of trade names | 7,489,000 | 7,489,000 | 9,143,000
Convert Italia S.p.A |  |  |
Non-amortized intangible assets |  |  |
Carrying value of trade names | 8,721,000 | 8,721,000 | 8,378,000
Valmont SM |  |  |
Non-amortized intangible assets |  |  |
Carrying value of trade names | 8,317,000 | 8,317,000 | 7,966,000
Ingal EPS/Ingal Civil Products |  |  |
Non-amortized intangible assets |  |  |
Carrying value of trade names | 7,261,000 | 7,261,000 | 7,454,000
Walpar |  |  |
Non-amortized intangible assets |  |  |
Carrying value of trade names | 3,500,000 | 3,500,000 | 3,500,000
Shakespeare |  |  |
Non-amortized intangible assets |  |  |
Carrying value of trade names | 4,000,000 | 4,000,000 | 4,000,000
Other |  |  |
Non-amortized intangible assets |  |  |
Carrying value of trade names | 14,489,000 | 14,489,000 | 17,555,000
Trade Names |  |  |
Non-amortized intangible assets |  |  |
Carrying value of trade names | 64,888,000 | 64,888,000 | $ 69,107,000
Impairment indefinite-lived intangible assets | $ 0 | $ 3,900,000 |

X
- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
Name: | us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of Trade Names Impaired + References No definition available. + Details
Name: | vmi_NumberOfTradeNamesImpaired
Namespace Prefix: | vmi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=vmi_NewmarkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=vmi_WebforgeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=vmi_ConvertItaliaSpAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=vmi_ValmontSMMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=vmi_IngalEPSOrIngalCivilProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=vmi_WalparLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=vmi_ShakespeareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=vmi_OtherTradeNamesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TradeNamesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |