v3.25.4

BUSINESS COMBINATIONS (Details) - USD ($) $ in Thousands				12 Months Ended
BUSINESS COMBINATIONS (Details) - USD ($) $ in Thousands	Jul. 14, 2025	Jun. 16, 2025	Dec. 23, 2024	Dec. 27, 2025	Aug. 08, 2024
BUSINESS COMBINATIONS
Aggregate acquisitions' net sales				$ 33,800
Aggregate acquisitions' operating loss				$ (2,400)
NS \| Construction
BUSINESS COMBINATIONS
Cash paid for business acquisition, net of cash acquired	$ 6,531
Percentage of assets purchased (as a percent)	100.00%
Intangible Assets	$ 3,045
Net Tangible Assets	$ 3,486
RWP \| Construction
BUSINESS COMBINATIONS
Cash paid for business acquisition, net of cash acquired		$ 7,360
Percentage of assets purchased (as a percent)		100.00%
Intangible Assets		$ 77
Net Tangible Assets		$ 7,283
C&L \| Packaging
BUSINESS COMBINATIONS
Cash paid for business acquisition, net of cash acquired			$ 29,901
Percentage of assets purchased (as a percent)			100.00%
Intangible Assets			$ 12,662
Net Tangible Assets			$ 17,239
UFP Palets \| Other operating segment \| International subsegment
BUSINESS COMBINATIONS
Percentage of stock purchase (as a percent)					20.00%

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UFP INDUSTRIES INC 10-K