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BUSINESS SEGMENTS (Details) $ in Thousands | 12 Months Ended
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Dec. 30, 2023 USD ($) segment | Dec. 31, 2022 USD ($) segment | Dec. 25, 2021 USD ($)
Business Segments |  |  |
Number of reportable segments | segment | 2 | 2 |
Net sales | $ 4,174,598 | $ 4,345,250 | $ 3,501,575
Operating income (loss) | 291,557 | 433,249 | 286,785
Interest expense, net | (50,578) | (45,519) | (41,420)
Other income (expenses) | (4,527) | (23,842) | 14,718
Earnings before income taxes and equity in loss of nonconsolidated subsidiaries | 236,452 | 363,888 | 260,083
Assets | 3,477,448 | 3,556,996 | 3,447,249
Capital expenditures | 96,771 | 93,288 | 107,790
Depreciation and amortization | 98,708 | 97,167 | 92,577
Point in Time |  |  |
Business Segments |  |  |
Net sales | 2,888,772 | 2,995,139 | 2,384,575
Over Time |  |  |
Business Segments |  |  |
Net sales | 1,285,826 | 1,350,111 | 1,117,000
Transmission, Distribution and Substation |  |  |
Business Segments |  |  |
Net sales | 1,243,768 | 1,184,660 | 935,099
Lighting and Transportation |  |  |
Business Segments |  |  |
Net sales | 964,072 |  | 825,923
Coatings |  |  |
Business Segments |  |  |
Net sales | 345,310 | 341,380 | 299,072
Telecommunications |  |  |
Business Segments |  |  |
Net sales | 252,165 | 320,342 | 238,527
Solar |  |  |
Business Segments |  |  |
Net sales | 194,322 | 122,902 | 62,904
Irrigation Equipment and Parts |  |  |
Business Segments |  |  |
Net sales | 1,062,163 | 1,220,200 | 919,190
Technology Products and Services |  |  |
Business Segments |  |  |
Net sales | 112,798 | 115,085 | 97,859
Other |  |  |
Business Segments |  |  |
Net sales |  | 100,219 | 123,001
Lighting, Traffic, and Highway Safety Products |  |  |
Business Segments |  |  |
Net sales |  | 940,462 |
United States |  |  |
Business Segments |  |  |
Net sales | 2,860,951 | 2,965,673 | 2,260,198
North America |  |  |
Business Segments |  |  |
Net sales | 2,889,575 | 2,975,020 | 2,247,862
International |  |  |
Business Segments |  |  |
Net sales | 1,285,023 | 1,370,230 | 1,253,713
Coatings |  |  |
Business Segments |  |  |
Operating income (loss) | (121,546) | (102,772) | (83,648)
Assets | 249,726 | 176,608 | 249,534
Infrastructure |  |  |
Business Segments |  |  |
Net sales | 2,999,637 | 2,909,746 | 2,361,524
Operating income (loss) | 396,253 | 354,499 | 273,598
Assets | 2,249,132 | 2,267,800 | 2,102,851
Capital expenditures | 68,295 | 53,228 | 72,129
Depreciation and amortization | 64,654 | 62,398 | 59,748
Infrastructure | Point in Time |  |  |
Business Segments |  |  |
Net sales | 1,744,139 | 1,687,458 | 1,388,297
Infrastructure | Over Time |  |  |
Business Segments |  |  |
Net sales | 1,255,498 | 1,222,288 | 973,227
Agriculture |  |  |
Business Segments |  |  |
Net sales | 1,174,961 | 1,335,285 | 1,017,050
Operating income (loss) | 16,850 | 179,263 | 137,027
Assets | 978,590 | 1,112,588 | 1,027,272
Capital expenditures | 10,890 | 32,886 | 17,509
Depreciation and amortization | 23,409 | 23,681 | 17,813
Agriculture | Point in Time |  |  |
Business Segments |  |  |
Net sales | 1,144,633 | 1,307,681 | 996,278
Agriculture | Over Time |  |  |
Business Segments |  |  |
Net sales | 30,328 | 27,604 | 20,772
Other Segments |  |  |
Business Segments |  |  |
Net sales |  | 100,219 | 123,001
Operating income (loss) |  | 2,259 | (40,192)
Assets |  |  | 67,592
Capital expenditures |  |  | 345
Depreciation and amortization |  | 1,393 | 5,988
Corporate |  |  |
Business Segments |  |  |
Operating income (loss) | (121,546) | (102,772) | (83,648)
Capital expenditures | 17,586 | 7,174 | 17,807
Depreciation and amortization | 10,645 | 9,695 | 9,028
Operating segment |  |  |
Business Segments |  |  |
Net sales | 4,192,290 | 4,375,310 | 3,523,818
Operating segment | Infrastructure |  |  |
Business Segments |  |  |
Net sales | 3,010,067 | 2,928,419 | 2,372,100
Operating segment | Infrastructure | Transmission, Distribution and Substation |  |  |
Business Segments |  |  |
Net sales | 1,243,768 | 1,184,660 | 935,099
Operating segment | Infrastructure | Lighting and Transportation |  |  |
Business Segments |  |  |
Net sales | 964,072 |  | 825,923
Operating segment | Infrastructure | Coatings |  |  |
Business Segments |  |  |
Net sales | 354,330 | 356,707 | 309,647
Operating segment | Infrastructure | Telecommunications |  |  |
Business Segments |  |  |
Net sales | 252,165 | 320,342 | 238,527
Operating segment | Infrastructure | Solar |  |  |
Business Segments |  |  |
Net sales | 195,732 | 126,248 | 62,904
Operating segment | Infrastructure | Lighting, Traffic, and Highway Safety Products |  |  |
Business Segments |  |  |
Net sales |  | 940,462 |
Operating segment | Infrastructure | North America |  |  |
Business Segments |  |  |
Net sales | 2,318,801 | 2,234,339 | 1,724,531
Operating segment | Infrastructure | International |  |  |
Business Segments |  |  |
Net sales | 691,266 | 694,080 | 647,569
Operating segment | Agriculture |  |  |
Business Segments |  |  |
Net sales | 1,182,223 | 1,346,672 | 1,028,717
Operating segment | Agriculture | Irrigation Equipment and Parts |  |  |
Business Segments |  |  |
Net sales | 1,069,425 | 1,231,587 | 930,858
Operating segment | Agriculture | Technology Products and Services |  |  |
Business Segments |  |  |
Net sales | 112,798 | 115,085 | 97,859
Operating segment | Agriculture | North America |  |  |
Business Segments |  |  |
Net sales | 587,056 | 766,929 | 545,574
Operating segment | Agriculture | International |  |  |
Business Segments |  |  |
Net sales | 595,167 | 579,743 | 483,143
Operating segment | Other Segments |  |  |
Business Segments |  |  |
Net sales |  | 100,219 | 123,001
Operating segment | Other Segments | Other |  |  |
Business Segments |  |  |
Net sales |  | 100,219 | 123,001
Operating segment | Other Segments | International |  |  |
Business Segments |  |  |
Net sales |  | 100,219 | 123,001
Intersegment |  |  |
Business Segments |  |  |
Net sales | (17,692) | (30,060) | (22,243)
Intersegment | Coatings |  |  |
Business Segments |  |  |
Net sales | (9,020) | (15,327) | (10,575)
Intersegment | Solar |  |  |
Business Segments |  |  |
Net sales | (1,410) | (3,346) |
Intersegment | Irrigation Equipment and Parts |  |  |
Business Segments |  |  |
Net sales | (7,262) | (11,387) | (11,668)
Intersegment | North America |  |  |
Business Segments |  |  |
Net sales | (16,282) | (26,248) | (22,243)
Intersegment | International |  |  |
Business Segments |  |  |
Net sales | (1,410) | (3,812) |
Intersegment | Infrastructure |  |  |
Business Segments |  |  |
Net sales | (10,430) | (18,673) | (10,576)
Intersegment | Agriculture |  |  |
Business Segments |  |  |
Net sales | $ (7,262) | $ (11,387) | $ (11,667)

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Namespace Prefix: | vmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |