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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Equity Method Investments (Details) - USD ($) $ in Millions	Dec. 30, 2023	Sep. 20, 2023	Jun. 27, 2022
Dempsey Wood Products, LLC
Summary of significant accounting policies
Ownership interest			50.00%
UFP Palets
Summary of significant accounting policies
Ownership interest		80.00%
Dempsey Wood Products, LLC
Summary of significant accounting policies
Call right			$ 70.0
Carrying value	$ 61.4
Sellers | Dempsey Wood Products, LLC
Summary of significant accounting policies
Ownership interest			50.00%
Sellers | UFP Palets
Summary of significant accounting policies
Ownership interest		20.00%
Sellers | Dempsey Wood Products, LLC
Summary of significant accounting policies
Sellers put right			$ 50.0

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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