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ACQUISITIONS - Narrative (Details) - USD ($) |  |  |  |  |  | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 29, 2020 | Mar. 06, 2020 | Feb. 01, 2020 | May 13, 2019 | Feb. 11, 2019 | Dec. 26, 2020 | Apr. 30, 2019 | Jun. 27, 2020 | Mar. 28, 2020 | Feb. 29, 2020 | Dec. 28, 2019 | Dec. 29, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 430,322,000 |  |  |  |  | $ 428,864,000 | $ 385,207,000
Energia Solar do Brasil |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage acquired | 55.00% |  |  |  |  |  |  |  |  |  |  |
Cash paid to acquire business | $ 4,308,000 |  |  |  |  |  |  |  |  |  |  |
Contingent consideration liability, current | 646,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill | 3,341,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill expected to be tax deductible | 0 |  |  |  |  |  |  |  |  |  |  |
KC Utility Packaging |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage acquired |  | 75.00% |  |  |  |  |  |  |  |  |  |
Cash paid to acquire business |  | $ 4,200,000 |  |  |  |  |  |  |  |  |  |
Contingent consideration liability, current |  | 400,000 |  |  |  |  |  |  |  |  |  |
Goodwill |  | 1,100,000 |  |  |  |  |  |  |  |  |  |
Connect-It Wireless, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash paid to acquire business |  |  |  | $ 6,034,000 |  |  |  |  |  |  |  |
Goodwill |  |  |  | 3,299,000 |  |  |  |  |  |  |  |
United Galvanizing |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash paid to acquire business |  |  |  |  | $ 26,000,000 |  |  |  |  |  |  |
Contingent consideration liability, current |  |  |  |  | 2,000,000 |  |  |  |  |  |  |
Goodwill |  |  |  |  | 12,374,000 |  |  |  |  |  |  |
Consideration transferred |  |  |  |  | 28,000,000 |  |  |  |  |  |  |
Goodwill expected to be tax deductible |  |  |  |  | 0 |  |  |  |  |  |  |
Settlement of representations and warranties |  |  |  |  |  |  |  |  | $ 1,522,000 |  |  |
Property, plant, and equipment acquired |  |  |  |  | 10,987,000 |  |  |  |  |  |  |
AgSense |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage acquired |  |  |  |  |  | 100.00% |  |  |  | 49.00% |  |
Consideration transferred |  |  | $ 43,983,000 |  |  |  |  |  |  |  |  |
Holdback payment |  |  |  |  |  |  |  | $ 2,200,000 |  |  |  |
Deferred tax asset recognized |  |  |  |  |  | $ 7,700,000 |  |  |  |  |  |
Torrent Engineering and Equipment |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage acquired |  |  |  |  |  | 40.00% |  |  |  |  |  |
Consideration transferred |  |  |  |  |  | $ 3,500,000 |  |  |  |  |  |
Convert |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage acquired |  |  |  |  |  |  |  |  | 16.00% |  |  |
Consideration transferred |  |  |  |  |  |  |  |  | $ 11,750,000 |  |  |
Convert | Minority Interest Owner |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage not owned by the Company |  |  |  |  |  |  |  |  | 25.00% |  |  |
Valmont SM |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage acquired |  |  |  |  |  |  | 4.80% |  |  |  |  |
Consideration transferred |  |  |  |  |  |  | $ 4,763,000 |  |  |  |  |
Customer Relationships | Energia Solar do Brasil |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships and other intangible assets | $ 3,718,000 |  |  |  |  |  |  |  |  |  |  |
Useful life | 8 years |  |  |  |  |  |  |  |  |  |  |
Customer Relationships | KC Utility Packaging |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships and other intangible assets |  | 4,000,000 |  |  |  |  |  |  |  |  |  |
Customer Relationships | Connect-It Wireless, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships and other intangible assets |  |  |  | $ 828,000 |  |  |  |  |  |  |  |
Customer Relationships | United Galvanizing |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships and other intangible assets |  |  |  |  | $ 3,170,000 |  |  |  |  |  |  |
Useful life |  |  |  |  | 10 years |  |  |  |  |  |  |
Other | KC Utility Packaging |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships and other intangible assets |  | $ 500,000 |  |  |  |  |  |  |  |  |  |
Trade Names | United Galvanizing |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships and other intangible assets |  |  |  |  | $ 894,000 |  |  |  |  |  |  |

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