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ACQUISITIONS - Narrative (Details) - USD ($) $ in Thousands |  |  |  |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
May 29, 2020 | May 13, 2019 | Feb. 11, 2019 | Dec. 31, 2018 | Feb. 29, 2020 | Apr. 30, 2019 | Jun. 27, 2020 | Dec. 28, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 417,668 | $ 428,864
Energia Solar do Brasil |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage acquired | 55.00% |  |  |  |  |  |  |
Cash paid in acquisition | $ 4,308 |  |  |  |  |  |  |
Contingent consideration liability, current | 646 |  |  |  |  |  |  |
Goodwill | 3,341 |  |  |  |  |  |  |
Connect-It Wireless, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash paid in acquisition |  | $ 6,034 |  |  |  |  |  |
Goodwill |  | 3,299 |  |  |  |  |  |
United Galvanizing |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Contingent consideration liability, current |  |  | $ 2,000 |  |  |  |  |
Consideration transfered |  |  | $ 28,000 |  |  |  |  |
Settled representations and warranties |  |  |  |  |  |  | $ 1,522 |
Larson Camouflage |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Consideration transfered |  |  |  | $ 34,562 |  |  |  |
Settled representations and warranties |  |  |  | $ 3,481 |  |  |  |
Contingent consideration liability, as percent of purchase price (percent) |  |  |  | 10.00% |  |  |  |
AgSense |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage acquired |  |  |  |  | 49.00% |  | 100.00% |
Consideration transfered |  |  |  |  | $ 43,983 |  |  |
Holdback payment |  |  |  |  |  |  | $ 2,200 |
Deferred tax asset recognized |  |  |  |  |  |  | $ 7,700 |
Convert Italia S.p.A |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage acquired |  |  |  |  | 16.00% |  |  |
Consideration transfered |  |  |  |  | $ 11,750 |  |  |
Convert Italia S.p.A | 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 transfered |  |  |  |  |  | $ 4,763 |  |
Customer Relationships | Energia Solar do Brasil |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Intangible assets acquired | $ 3,718 |  |  |  |  |  |  |
Useful life | 8 years |  |  |  |  |  |  |
Customer Relationships | Connect-It Wireless, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Intangible assets acquired |  | $ 828 |  |  |  |  |  |

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