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SEGMENT REPORTING - Net Sales by Business Unit (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 27, 2025
Sep. 27, 2025
Jun. 28, 2025
Mar. 29, 2025
Dec. 28, 2024
Sep. 28, 2024
Jun. 29, 2024
Mar. 30, 2024
Dec. 27, 2025
Dec. 28, 2024
Dec. 30, 2023
Revenue                      
Net sales $ 1,329,823 $ 1,559,627 $ 1,835,374 $ 1,595,519 $ 1,462,001 $ 1,649,383 $ 1,901,959 $ 1,638,966 $ 6,320,343 $ 6,652,309 $ 7,218,384
Corporate                      
Revenue                      
Net sales                 7,729 5,718 3,726
Retail | Operating Segments                      
Revenue                      
Net sales                 2,433,556 2,597,994 2,956,007
Retail | Operating Segments | Deckorators                      
Revenue                      
Net sales                 299,931 297,217 309,419
Retail | Operating Segments | ProWood                      
Revenue                      
Net sales                 2,028,949 2,154,398 2,495,493
Retail | Operating Segments | UFP Edge                      
Revenue                      
Net sales                 104,676 146,379 151,095
Packaging | Operating Segments                      
Revenue                      
Net sales                 1,603,723 1,636,563 1,838,200
Packaging | Operating Segments | Structural Packaging                      
Revenue                      
Net sales                 999,344 1,045,149 1,225,204
Packaging | Operating Segments | PalletOne                      
Revenue                      
Net sales                 521,949 517,906 530,642
Packaging | Operating Segments | Protective Packaging                      
Revenue                      
Net sales                 82,430 73,508 82,354
Construction | Operating Segments                      
Revenue                      
Net sales                 2,003,785 2,113,844 2,161,059
Construction | Operating Segments | Factory Built                      
Revenue                      
Net sales                 838,177 815,577 718,773
Construction | Operating Segments | Site-Built                      
Revenue                      
Net sales                 713,759 875,087 977,129
Construction | Operating Segments | Commercial                      
Revenue                      
Net sales                 265,657 248,777 265,079
Construction | Operating Segments | Concrete Forming                      
Revenue                      
Net sales                 186,192 174,403 200,078
All Other | Operating Segments                      
Revenue                      
Net sales                 $ 271,550 $ 298,190 $ 259,392