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ACQUISITIONS - Narrative (Details) $ in Thousands |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |
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Jan. 26, 2024 USD ($) | Aug. 31, 2023 USD ($) payment | Aug. 31, 2023 AUD ($) | Aug. 10, 2022 USD ($) | Jun. 01, 2022 USD ($) | May 10, 2022 USD ($) | May 12, 2021 USD ($) | Apr. 20, 2021 USD ($) | Mar. 30, 2024 USD ($) | Dec. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 25, 2021 USD ($) | Aug. 31, 2023 AUD ($) payment
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, net of cash acquired |  |  |  |  |  |  |  |  |  | $ 32,676,000 | $ 39,287,000 | $ 312,500,000 |
Fair Values of Assets Acquired and Liabilities Assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | 632,964,000 | 739,861,000 | $ 708,566,000 |
Operating lease liabilities |  |  |  |  |  |  |  |  |  | 182,296,000 | 172,326,000 |  |
Redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  | $ 62,792,000 | $ 60,865,000 |  |
Minority Interest Owner | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Values of Assets Acquired and Liabilities Assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  | $ 10,518,000 |  |  |  |
HR Products |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, net of cash acquired |  | $ 37,302,000 | $ 58,044 |  |  |  |  |  |  |  |  |  |
Retention fund, withheld |  | $ 4,626,000 |  |  |  |  |  |  |  |  |  |  | $ 7,200
Number of equal payments of retention fund | payment |  | 2 |  |  |  |  |  |  |  |  |  |  | 2
Payment due of first installment of retention fund, from the date of acquisition |  | 12 months | 12 months |  |  |  |  |  |  |  |  |  |
Payment due of second installment of retention fund, from the date of acquisition |  | 24 months | 24 months |  |  |  |  |  |  |  |  |  |
Fair Values of Assets Acquired and Liabilities Assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets |  | $ 24,816,000 |  |  |  |  |  |  |  |  |  |  |
Property, plant, and equipment |  | 1,379,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 9,177,000 |  |  |  |  |  |  |  |  |  |  |
Other non-current assets |  | 3,997,000 |  |  |  |  |  |  |  |  |  |  |
Total fair value of assets acquired |  | 51,001,000 |  |  |  |  |  |  |  |  |  |  |
Current Liabilities |  | 4,183,000 |  |  |  |  |  |  |  |  |  |  |
Operating lease liabilities |  | 2,792,000 |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes |  | 3,489,000 |  |  |  |  |  |  |  |  |  |  |
Total fair value of liabilities assumed |  | 10,464,000 |  |  |  |  |  |  |  |  |  |  |
Net assets acquired |  | 40,537,000 |  |  |  |  |  |  |  |  |  |  |
Other non-current assets |  | 3,997,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill expected to be tax deductible |  | 0 |  |  |  |  |  |  |  |  |  |  |
ConcealFab |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Values of Assets Acquired and Liabilities Assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  | $ 21,133,000 |  |  |  |  |  |  |  |
Property, plant, and equipment |  |  |  |  | 3,813,000 |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 42,465,000 |  |  |  |  |  |  |  |
Other non-current assets |  |  |  |  | 9,108,000 |  |  |  |  |  |  |  |
Total fair value of assets acquired |  |  |  |  | 107,719,000 |  |  |  |  |  |  |  |
Current Liabilities |  |  |  |  | 6,658,000 |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | 2,038,000 |  |  |  |  |  |  |  |
Operating lease liabilities |  |  |  |  | 7,812,000 |  |  |  |  |  |  |  |
Deferred income taxes |  |  |  |  | 5,464,000 |  |  |  |  |  |  |  |
Other non-current liabilities |  |  |  |  | 12,000 |  |  |  |  |  |  |  |
Total fair value of liabilities assumed |  |  |  |  | 21,984,000 |  |  |  |  |  |  |  |
Redeemable noncontrolling interests |  |  |  |  | 41,693,000 |  |  |  |  |  |  |  |
Net assets acquired |  |  |  |  | 44,042,000 |  |  |  |  |  |  |  |
Other non-current assets |  |  |  |  | $ 9,108,000 |  |  |  |  |  |  |  |
Percentage acquired |  |  |  |  | 51.00% |  |  |  |  |  |  |  |
Cash paid to acquire business |  |  |  |  | $ 39,287,000 |  |  |  |  |  |  |  |
Contingent consideration liability, current |  |  |  |  | 1,850,000 |  |  |  |  |  |  |  |
ConcealFab | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Values of Assets Acquired and Liabilities Assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage acquired | 9.00% |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred | $ 7,227,000 |  |  |  |  |  |  |  |  |  |  |  |
Prospera |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Values of Assets Acquired and Liabilities Assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  | $ 647,000 |  |  |  |  |  |
Property, plant, and equipment |  |  |  |  |  |  | 1,063,000 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 273,453,000 |  |  |  |  |  |
Total fair value of assets acquired |  |  |  |  |  |  | 310,913,000 |  |  |  |  |  |
Current Liabilities |  |  |  |  |  |  | 2,690,000 |  |  |  |  |  |
Deferred income taxes |  |  |  |  |  |  | 8,223,000 |  |  |  |  |  |
Total fair value of liabilities assumed |  |  |  |  |  |  | 10,913,000 |  |  |  |  |  |
Net assets acquired |  |  |  |  |  |  | 300,000,000 |  |  |  |  |  |
Cash paid to acquire business |  |  |  |  |  |  | 300,000,000 |  |  |  |  |  |
Goodwill expected to be tax deductible |  |  |  |  |  |  | 0 |  |  |  |  |  |
PivoTrac |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Values of Assets Acquired and Liabilities Assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 10,800,000 |  |  |  |  |
Cash paid to acquire business |  |  |  |  |  |  |  | 12,500,000 |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  | 14,000,000 |  |  |  |  |
Contingent consideration liability, current |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |
Goodwill expected to be tax deductible |  |  |  |  |  |  |  | 0 |  |  |  |  |
Convert Italia S.p.A. |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Values of Assets Acquired and Liabilities Assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage acquired |  |  |  | 9.00% |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  | $ 3,046,000 |  |  |  |  |  |  |  |  |
Valmont West Coast Engineering |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Values of Assets Acquired and Liabilities Assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage acquired |  |  |  |  |  | 20.00% |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  | $ 4,292,000 |  |  |  |  |  |  |
Customer relationships | HR Products |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Values of Assets Acquired and Liabilities Assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  | $ 11,632,000 |  |  |  |  |  |  |  |  |  |  |
Customer relationships | ConcealFab |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Values of Assets Acquired and Liabilities Assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  | 26,200,000 |  |  |  |  |  |  |  |
Customer relationships | PivoTrac |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Values of Assets Acquired and Liabilities Assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  | $ 2,627,000 |  |  |  |  |
Useful life |  |  |  |  |  |  |  | 8 years |  |  |  |  |
Proprietary technology intangible asset related to Prospera | Prospera |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Values of Assets Acquired and Liabilities Assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | $ 32,900,000 |  |  |  |  |  |
Useful life |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Trade names | ConcealFab |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Values of Assets Acquired and Liabilities Assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |
Trade names | Prospera |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Values of Assets Acquired and Liabilities Assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | $ 2,850,000 |  |  |  |  |  |
Useful life |  |  |  |  |  |  | 7 years |  |  |  |  |  |

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