UFP Industries (UFPI) 10-K 28 Feb 24 2023 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 30, 2023	Feb. 03, 2024	Jul. 01, 2023
Document and Entity Information
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 30, 2023
Entity File Number	0-22684
Entity Registrant Name	UFP INDUSTRIES, INC.
Entity Incorporation, State or Country Code	MI
Entity Tax Identification Number	38-1465835
Entity Address, Address Line One	2801 East Beltline, N.E.
Entity Address, City or Town	Grand Rapids
Entity Address, State or Province	MI
Entity Address, Postal Zip Code	49525
City Area Code	616
Local Phone Number	364-6161
Title of 12(b) Security	Common Stock, $1 par value
Trading Symbol	UFPI
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Document Financial Statement Error Correction [Flag]	false
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		61,624,287
ICFR Auditor Attestation Flag	true
Auditor Name	Deloitte & Touche LLP
Auditor Firm ID	34
Auditor Location	Grand Rapids, MI
Current Fiscal Year End Date	--12-30
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Entity Central Index Key	0000912767
Amendment Flag	false
Entity Public Float			$ 5,684,288,927
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 30, 2023	Dec. 31, 2022
CURRENT ASSETS:
Cash and cash equivalents	$ 1,118,329	$ 559,397
Restricted cash	3,927	226
Investments	34,745	36,013
Accounts receivable, net	549,499	617,604
Inventories:
Raw materials	352,785	398,798
Finished goods	375,003	574,429
Total inventories	727,788	973,227
Refundable income taxes	29,327	33,126
Other current assets	38,474	42,520
TOTAL CURRENT ASSETS	2,502,089	2,262,113
DEFERRED INCOME TAXES	4,228	3,750
RESTRICTED INVESTMENTS	24,838	19,898
RIGHT OF USE ASSETS	103,774	107,517
OTHER ASSETS	87,438	101,262
GOODWILL	336,313	337,320
INDEFINITE-LIVED INTANGIBLE ASSETS	7,345	7,339
OTHER INTANGIBLE ASSETS, NET	175,195	143,892
PROPERTY, PLANT AND EQUIPMENT:
Property, plant and equipment	1,559,304	1,379,968
Less accumulated depreciation and amortization	(782,727)	(690,986)
PROPERTY, PLANT AND EQUIPMENT, NET	776,577	688,982
TOTAL ASSETS	4,017,797	3,672,073
CURRENT LIABILITIES:
Accounts payable	203,055	206,941
Accrued liabilities:
Compensation and benefits	232,331	296,120
Other	66,713	80,255
Current portion of lease liability	22,977	25,577
Current portion of long-term debt	42,900	2,942
TOTAL CURRENT LIABILITIES	567,976	611,835
LONG-TERM DEBT	233,534	275,154
LEASE LIABILITY	84,885	85,419
DEFERRED INCOME TAXES	45,248	51,265
OTHER LIABILITIES	35,934	44,697
TOTAL LIABILITIES	967,577	1,068,370
TEMPORARY EQUITY:
Redeemable noncontrolling interest	20,030	6,880
Controlling interest shareholders' equity:
Preferred stock, no par value; shares authorized 1,000,000; issued and outstanding, none
Common stock, $1 par value; shares authorized 160,000,000; issued and outstanding, 61,621,004 and 61,618,193	61,621	61,618
Additional paid-in capital	354,702	294,029
Retained earnings	2,582,332	2,217,410
Accumulated other comprehensive loss	1,106	(9,075)
Total controlling interest shareholders' equity	2,999,761	2,563,982
Noncontrolling interest	30,429	32,841
TOTAL SHAREHOLDERS' EQUITY	3,030,190	2,596,823
TOTAL LIABILITIES, TEMPORARY EQUITY AND SHAREHOLDERS' EQUITY	$ 4,017,797	$ 3,672,073

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 30, 2023	Dec. 31, 2022
SHAREHOLDERS' EQUITY:
Preferred stock, no par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common Stock, Par or Stated Value Per Share	$ 1	$ 1
Common stock, shares authorized (in shares)	160,000,000	160,000,000
Common stock, shares issued (in shares)	61,621,004	61,618,193
Common stock, shares outstanding (in shares)	61,621,004	61,618,193

CONSOLIDATED STATEMENTS OF EARN

CONSOLIDATED STATEMENTS OF EARNINGS AND COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
CONSOLIDATED STATEMENTS OF EARNINGS AND COMPREHENSIVE INCOME
NET SALES	$ 7,218,384	$ 9,626,739	$ 8,636,134
COST OF GOODS SOLD	5,799,446	7,837,278	7,229,167
GROSS PROFIT	1,418,938	1,789,461	1,406,967
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES	766,633	832,079	682,253
OTHER LOSSES (GAINS), NET	5,771	7,198	(12,840)
EARNINGS FROM OPERATIONS	646,534	950,184	737,554
INTEREST EXPENSE	12,842	13,910	13,814
INTEREST AND INVESTMENT INCOME	(39,916)	(725)	(6,498)
EQUITY IN LOSS OF INVESTEE	2,367	2,183	3,902
INTEREST AND OTHER	(24,707)	15,368	11,218
EARNINGS BEFORE INCOME TAXES	671,241	934,816	726,336
INCOME TAXES	156,784	229,852	173,972
NET EARNINGS	514,457	704,964	552,364
NET (EARNINGS) LOSS ATTRIBUTABLE TO NONCONTROLLING INTEREST	(145)	(12,313)	(16,724)
NET EARNINGS ATTRIBUTABLE TO CONTROLLING INTEREST	$ 514,312	$ 692,651	$ 535,640
EARNINGS PER SHARE - BASIC (USD per share)	$ 8.21	$ 11.05	$ 8.61
EARNINGS PER SHARE - DILUTED (USD per share)	$ 8.07	$ 10.97	$ 8.59
OTHER COMPREHENSIVE INCOME:
NET EARNINGS	$ 514,457	$ 704,964	$ 552,364
OTHER COMPREHENSIVE INCOME (LOSS)	14,836	(2,498)	(5,296)
COMPREHENSIVE INCOME	529,293	702,466	547,068
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST	(4,800)	(13,485)	(15,039)
COMPREHENSIVE INCOME ATTRIBUTABLE TO CONTROLLING INTEREST	$ 524,493	$ 688,981	$ 532,029

CONSOLIDATED STATEMENTS OF SHAR

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Earnings	Noncontrolling Interest	Total
Beginning balance at Dec. 26, 2020	$ 61,206	$ 218,224	$ 1,182,680	$ (1,794)	$ 22,836	$ 1,483,152
Increase (Decrease) in Stockholders' Equity
Net earnings (loss)			535,640		16,724	552,364
Foreign currency translation adjustment				(2,584)	(1,685)	(4,269)
Unrealized gain on investments and other				(1,027)		(1,027)
Distributions to NCI					(6,750)	(6,750)
NCI related to business combinations					6,831	6,831
Cash dividends			(40,209)			(40,209)
Issuance of shares under employee stock purchase plan	33	2,083				2,116
Net issuance (forfeitures) of shares under stock grant programs	546	3,506	10			4,062
Issuance of shares under deferred compensation plans	117	(117)
Expense associated with share-based compensation arrangements		11,071				11,071
Accrued expense under deferred compensation plans		9,228				9,228
Ending balance at Dec. 25, 2021	61,902	243,995	1,678,121	(5,405)	37,956	2,016,569
Increase (Decrease) in Stockholders' Equity
Net earnings (loss)			692,651		12,210	704,861
Foreign currency translation adjustment				(1,841)	1,802	(39)
Unrealized gain on investments and other				(1,829)		(1,829)
Distributions to NCI					(12,024)	(12,024)
Contributions to NCI					538	538
Redeemable NCI					(7,641)	(7,641)
Cash dividends			(58,860)			(58,860)
Issuance of shares under employee stock purchase plan	44	2,725				2,769
Net issuance (forfeitures) of shares under stock grant programs	806	9,919	25			10,750
Issuance of shares under deferred compensation plans	113	(113)
Repurchase of shares	(1,247)		(94,527)			(95,774)
Expense associated with share-based compensation arrangements		27,987				27,987
Accrued expense under deferred compensation plans		9,516				9,516
Ending balance at Dec. 31, 2022	61,618	294,029	2,217,410	(9,075)	32,841	2,596,823
Increase (Decrease) in Stockholders' Equity
Net earnings (loss)			514,312		663	514,975
Foreign currency translation adjustment				9,762	4,267	14,029
Unrealized gain on investments and other				419		419
Distributions to NCI					(7,355)	(7,355)
Other		817			(930)	(113)
Purchase of remaining NCI of subsidiary		(1,210)			(917)	(2,127)
Cash dividends			(68,238)			(68,238)
Issuance of shares under employee stock purchase plan	33	2,717				2,750
Net issuance (forfeitures) of shares under stock grant programs	821	14,485	22			15,328
Issuance of shares under deferred compensation plans	124	(124)
Repurchase of shares	(975)		(81,174)			(82,149)
Expense associated with share-based compensation arrangements		34,727				34,727
Accrued expense under deferred compensation plans		10,895				10,895
Ending balance at Dec. 30, 2023	$ 61,621	$ 354,702	$ 2,582,332	$ 1,106	$ 30,429	$ 3,030,190

CONSOLIDATED STATEMENTS OF SH_2

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022
Increase (Decrease) in Temporary Equity
Beginning balance	$ 6,880
Net earnings (loss)	(518)	103
Foreign currency translation adjustment	388	(630)
NCI related to business combinations	13,237	(234)
Other	43
Redeemable NCI		7,641
Ending balance	$ 20,030	$ 6,880

CONSOLIDATED STATEMENTS OF SH_3

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Increase (Decrease) in Stockholders' Equity
Cash dividends per share (USD per share)	$ 1.10	$ 0.95	$ 0.65
Net issuance of shares under employee stock plans (in shares)	32,944	44,012	33,104
Net issuance (forfeiture) of shares under stock grant programs (in shares)	820,591	805,562	546,235
Issuance of shares under deferred compensation plans (in shares)	124,145	113,384	116,732
Repurchase of shares (in shares)	974,869	1,246,616

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
CASH FLOWS USED IN OPERATING ACTIVITIES:
Net earnings	$ 514,457	$ 704,964	$ 552,364
Adjustments to reconcile net earnings to net cash used in operating activities:
Depreciation	110,563	94,063	84,184
Amortization of intangibles	21,327	19,499	13,948
Expense associated with share-based and grant compensation arrangements	34,899	28,156	11,224
Deferred income taxes (credit)	(5,573)	(16,289)	5,653
Unrealized (gain) loss on investments and other	(2,435)	5,768	(4,118)
Equity in loss of investee	2,367	2,183	3,902
Net (gain) loss on sale and disposition of assets	(260)	1,285	(11,992)
Impairment of goodwill and other intangibles		4,261
Gain from reduction of estimated earnout liability	(3,177)
Changes in:
Accounts receivable	81,659	130,704	(85,439)
Inventories	250,561	718	(260,301)
Accounts payable and cash overdraft	(3,578)	(137,907)	78,060
Accrued liabilities and other	(40,920)	(5,838)	124,992
NET CASH FROM OPERATING ACTIVITIES	959,890	831,567	512,477
CASH FLOWS USED IN INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(180,382)	(174,124)	(151,166)
Proceeds from sale of property, plant and equipment	3,291	3,805	29,973
Acquisitions, net of cash received and purchase of equity method investment	(52,383)	(180,151)	(475,960)
Purchase and dissolution of remaining noncontrolling interest in subsidiary	(2,127)
Purchases of investments	(29,806)	(19,875)	(23,797)
Proceeds from sale of investments	29,935	12,874	14,882
Other	(8,692)	3,535	(5,119)
NET CASH USED IN INVESTING ACTIVITIES	(240,164)	(353,936)	(611,187)
CASH FLOWS USED IN FINANCING ACTIVITIES:
Borrowings under revolving credit facilities	28,462	605,101	892,072
Repayments under revolving credit facilities	(30,125)	(607,549)	(888,695)
Repayments of debt	(29)	(38,719)
Contingent consideration payments and other	(6,262)	(2,856)	(3,176)
Proceeds from issuance of common stock	2,750	2,769	2,116
Dividends paid to shareholders	(68,238)	(58,860)	(40,209)
Distributions to noncontrolling interest	(7,355)	(12,024)	(6,750)
Repurchase of common stock	(82,149)	(95,774)
Other	86	(2,298)	(364)
NET CASH USED IN FINANCING ACTIVITIES	(162,860)	(210,210)	(45,006)
Effect of exchange rate changes on cash	5,767	979	(1,669)
NET CHANGE IN CASH AND CASH EQUIVALENTS	562,633	268,400	(145,385)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, BEGINNING OF YEAR	559,623	291,223	436,608
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, END OF PERIOD	$ 1,122,256	$ 559,623	$ 291,223

CONSOLIDATED STATEMENTS OF CA_2

CONSOLIDATED STATEMENTS OF CASH FLOWS - SUPPLEMENTAL (Parenthetical) - USD ($) $ in Thousands	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH:
Cash and cash equivalents, beginning of period	$ 559,397	$ 286,662	$ 436,507
Restricted cash, beginning of period	226	4,561	101
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, BEGINNING OF YEAR	559,623	291,223	436,608
Cash and cash equivalents, end of period	1,118,329	559,397	286,662
Restricted cash, end of period	3,927	226	4,561
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, END OF PERIOD	$ 1,122,256	$ 559,623	$ 291,223

CONSOLIDATED STATEMENTS OF CA_3

CONSOLIDATED STATEMENTS OF CASH FLOWS - SUPPLEMENTAL AND NON-CASH FINANCING ACTIVITIES (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
SUPPLEMENTAL INFORMATION:
Interest paid	$ 12,736	$ 13,953	$ 14,077
Income taxes paid	158,145	274,616	167,043
NON-CASH INVESTING ACTIVITIES
Capital expenditures included in accounts payable	3,178	3,185	3,256
NON-CASH FINANCING ACTIVITIES:
Common stock issued under deferred compensation plans	$ 10,978	$ 9,282	$ 7,487

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 30, 2023
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	A. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES OPERATIONS We are a holding company whose subsidiaries supply products primarily made from wood, wood and non-wood composites, and other materials to three markets: retail, construction and packaging. Founded in 1955, we are headquartered in Grand Rapids, Michigan, with affiliates throughout North America, Europe, Asia and Australia. PRINCIPLES OF CONSOLIDATION The accompanying consolidated financial statements, have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and with the rules and regulations of the Securities and Exchange Commission (the "SEC"), represent our assets and liabilities and operating results. The consolidated financial statements include our accounts and those of our wholly-owned and majority-owned subsidiaries and partnerships. All significant intercompany balances and transactions have been eliminated in consolidation. We consolidate entities in which we have a controlling financial interest. In determining whether we have a controlling financial interest in a partially owned entity and the requirement to consolidate the accounts of that entity, we consider factors such as ownership interest, board representation, management representation, authority to make decisions, and contractual and substantive participating rights of the partners/members as well as whether the entity is a variable interest entity (“VIE”) and whether we are the primary beneficiary. The primary beneficiary of a VIE is the entity that has (i) the power to direct the activities that most significantly impact the entity's economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE. The primary beneficiary is required to consolidate the VIE. We account for unconsolidated VIEs using the equity method of accounting. As a result of the investment in Dempsey on June 27, 2022, we own 50% of the issued equity of that entity, and the remaining 50% of the issued equity is owned by the previous owners (“Sellers”). The investment in Dempsey is an unconsolidated variable interest entity and we have accounted for it using the equity method of accounting because we do not have a controlling financial interest in the entity. Per the contracts, the Sellers have a put right to sell their equity interest to us for $50 million and we have a call right to purchase the Seller’s equity interest for $70 million, which are both first exercisable in June 2025 and expire in June 2030. As of December 30, 2023, the carrying value of our investment in Dempsey is $61.4 million and is recorded in Other Assets. Our maximum exposure to loss consists of our investment amount and any contingent loss that may occur in the future as a result of a change in the fair value of Dempsey relative to the strike price of the put option. NONCONTROLLING INTEREST IN SUBSIDIARIES Noncontrolling interest in results of operations of consolidated subsidiaries represents the noncontrolling shareholders’ share of the income or loss of various consolidated subsidiaries. The noncontrolling interest reflects the original investment by these noncontrolling shareholders combined with their proportional share of the earnings or losses of these subsidiaries, net of distributions paid. FISCAL YEAR Our fiscal year is a 52 or 53 week period, ending on the last Saturday of December. Unless otherwise stated, references to 2023, 2022, and 2021 relate to the fiscal years ended December 30, 2023, December 31, 2022, and December 25, 2021, respectively. Fiscal year 2023 was comprised of 52 weeks, fiscal year 2022 was comprised of 53 weeks and fiscal year 2021 was comprised of 52 weeks. FAIR VALUE DISCLOSURES OF FINANCIAL INSTRUMENTS We follow ASC Topic 820, Fair Value Measurements and Disclosures ● Level 1 — Financial instruments with unadjusted, quoted prices listed on active market exchanges. ● Level 2 — Financial instruments lacking unadjusted, quoted prices from active market exchanges, including over-the-counter traded financial instruments. Financial instrument values are determined using prices for recently traded financial instruments with similar underlying terms and direct or indirect observational inputs, such as interest rates and yield curves at commonly quoted intervals. ● Level 3 — Financial instruments not actively traded on a market exchange and there is little, if any, market activity. Values are determined using significant unobservable inputs or valuation techniques. Our investment portfolio includes restricted investments within our wholly-owned subsidiary, Ardellis Insurance Ltd. There are $24.8 million of restricted investments recorded as of December 30, 2023. CASH AND CASH EQUIVALENTS Cash and cash equivalents consist of cash and highly liquid investments purchased with an original maturity of three months or less. INVESTMENTS Investments are deemed to be "available for sale" and are, accordingly, carried at fair value being the quoted market value. ACCOUNTS RECEIVABLE AND ALLOWANCES We perform periodic credit evaluations of our customers and generally do not require collateral. Accounts receivable are due under a range of terms we offer to our customers. Discounts are offered, in most instances, as an incentive for early payment. We base our allowances related to receivables on historical credit and collections experience, reasonable and supportable forecasts, and the specific identification of other potential problems, including the general economic climate. Actual collections can differ, requiring adjustments to the allowances. Individual accounts receivable balances are evaluated on a monthly basis, and those balances considered uncollectible are charged to the allowance. The following table presents the activity in our accounts receivable allowances (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Additions ​ ​ ​ ​ ​ ​ ​ ​ ​ Charged to ​ ​ ​ ​ ​ ​ ​ ​ Beginning ​ Costs and ​ ​ ​ Ending ​ ​ Balance ​ Expenses ​ Deductions* ​ Balance Year Ended December 30, 2023: ​ ​ ​ ​ Allowance for possible losses on accounts receivable ​ $ 11,727 ​ $ 56,522 ​ $ (63,116) ​ $ 5,133 Year Ended December 31, 2022: ​ ​ ​ ​ Allowance for possible losses on accounts receivable ​ $ 5,085 ​ $ 79,862 ​ $ (73,220) ​ $ 11,727 Year Ended December 25, 2021: ​ ​ ​ ​ Allowance for possible losses on accounts receivable ​ $ 4,629 ​ $ 66,883 ​ $ (66,427) ​ $ 5,085 * Includes accounts charged off, discounts given to customers and actual customer returns and allowances. We record estimated sales returns, discounts, and other applicable adjustments as a reduction of net sales in the same period revenue is recognized. Accounts receivable retainage amounts related to long term construction contracts totaled $8.2 million and $8.0 million as of December 30, 2023 and December 31, 2022, respectively. All amounts are expected to be collected within 18 months. Concentration of accounts receivable related to our two largest customers totaled $118.0 million and $131.0 million as of December 30, 2023 and December 31, 2022, respectively. RECENTLY ISSUED ACCOUNTING GUIDANCE In December 2023, the FASB issued ASU 2023-09, "Income Taxes (Topic 740): Improvements to Income Tax Disclosures," which is intended to enhance the transparency, decision usefulness and effectiveness of income tax disclosures. The amendments in this ASU require a public entity to disclose a tabular tax rate reconciliation, using both percentages and currency, with specific categories. A public entity is also required to provide a qualitative description of the states and local jurisdictions that make up the majority of the effect of the state and local income tax category and the net amount of income taxes paid, disaggregated by federal, state and foreign taxes and also disaggregated by individual jurisdictions. The amendments also remove certain disclosures that are no longer considered cost beneficial. The amendments are effective prospectively for annual periods beginning after December 15, 2024, and early adoption and retrospective application are permitted. Although the ASU only modifies our required income tax disclosures, we are currently evaluating the impact of adopting this guidance on the consolidated financial statements. In November 2023, the FASB issued ASU 2023-07, "Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures," which is intended to improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses, allowing financial statement users to better understand the components of a segment's profit or loss to assess potential future cash flows for each reportable segment and the entity as a whole. The amendments expand a public entity's segment disclosures by requiring disclosure of significant segment expenses that are regularly provided to the chief operating decision maker ("CODM"), clarifying when an entity may report one or more additional measures to assess segment performance, requiring enhanced interim disclosures, providing new disclosure requirements for entities with a single reportable segment, and requiring other new disclosures. The amendments are effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, and early adoption is permitted. Although the ASU only requires additional disclosures about the Company's operating segments, we are currently evaluating the impact of adopting this guidance on the consolidated financial statements. In October 2021, the FASB issued ASU 2021-08, Business Combinations (Topic 805), Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. The ASU requires that an acquirer recognize and measure contract assets and contract liabilities in a business combination in accordance with Topic 606. The ASU is effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years and has been applied prospectively to all business combinations occurring after this date. INVENTORIES Inventories are stated at the lower of cost or net realizable value. The cost of inventories includes raw materials, direct labor, and manufacturing overhead and is determined using the weighted average cost method. Raw materials consist primarily of unfinished wood products and other materials expected to be manufactured or treated prior to sale, while finished goods represent various manufactured and treated wood products ready for sale. We have inventory on consignment at customer locations valued at $23.2 million as of December 30, 2023 and $27.9 million as of December 31, 2022. We write down the value of inventory, the impact of which is reflected in cost of goods sold in the Consolidated Statement of Earnings and Comprehensive Income, if the cost of specific inventory items on hand exceeds the amount we expect to realize from the ultimate sale or disposal of the inventory. These estimates are based on management's judgment regarding future demand and market conditions and analysis of historical experience. PROPERTY, PLANT, AND EQUIPMENT Property, plant, and equipment are stated at cost. Expenditures for renewals and betterments are capitalized, and maintenance and repairs are expensed as incurred. The components of property, plant and equipment as of December 30, 2023 and December 31, 2022 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended ​ December 30, December 31, ​ ​ 2023 ​ 2022 Land and improvements $ 185,188 ​ $ 171,729 Building and improvements ​ ​ 400,232 ​ ​ 355,228 Machinery and equipment ​ ​ 884,880 ​ ​ 708,095 Furniture and fixtures ​ 26,275 ​ ​ 23,186 Construction in progress ​ 62,729 ​ ​ 121,730 Total Property, Plant and Equipment, Gross ​ $ 1,559,304 ​ $ 1,379,968 ​ Amortization of assets held under finance leases is included in depreciation and amortized over the shorter of the estimated useful life of the asset or the lease term. Depreciation is computed principally by the straight-line method over the estimated useful lives of the assets as follows: ​ ​ ​ ​ Land improvements 5 to 15 years Buildings and improvements 10 to 32 years Machinery, equipment and office furniture 2 to 20 years ​ ​ LONG-LIVED ASSETS In accordance with ASC 360, Property, Plant, and Equipment GOODWILL Goodwill represents the excess of the purchase price over the fair value of net tangible and identifiable intangible assets of acquired businesses. Goodwill and intangible assets deemed to have indefinite lives are not amortized and are subject to impairment tests at least annually in accordance with ASC 350, Intangibles-Goodwill and Other. We review the carrying amounts of goodwill and other non-amortizable intangibles by reporting unit to determine if such assets may be impaired. As of the date of the most recent goodwill impairment test, which utilized data and assumptions as of September 30, 2023, it was determined that the fair values exceed the carrying values and there were no indicators for impairment for all of our reporting units. In the fourth quarter of 2022, we recorded a non-cash goodwill impairment charge of $2.5 million related to the Italian reporting unit within our all other segment. Subsequently, the Italian reporting unit was divested in 2023. We believe we have sufficient available information, both current and historical, to support our assumptions, judgments and estimates used in the goodwill impairment test. Our annual testing date for evaluating goodwill and indefinite-lived intangible asset impairment is the first day of our fourth fiscal quarter for all reporting units. Additionally, we review various triggering events throughout the year to determine whether a mid-year impairment analysis is required. FOREIGN CURRENCY Our foreign operations use the local currency as their functional currency. Accordingly, assets and liabilities are translated at exchange rates as of the balance sheet date and revenues and expenses are translated using weighted average rates, with translation adjustments included as a separate component of shareholders’ equity. Gains and losses arising from re-measuring foreign currency transactions are included in earnings. INSURANCE RESERVES Our wholly-owned insurance company, Ardellis Insurance Ltd.(“Ardellis”), was incorporated on April 21, 2001 under the laws of Bermuda and is licensed as a Class 3A insurer under the Insurance Act 1978 of Bermuda. On April 14, 2017 the U.S. Branch of Ardellis Insurance Ltd. was granted its Certificate of Authority to transact property and casualty insurance lines as an admitted carrier in the State of Michigan. We are primarily self-insured for certain employee health benefits, and have self-funded retentions for general liability, automobile liability, property and workers’ compensation. We are fully self-insured for environmental liabilities. The general liability, automobile liability, property, workers’ compensation, and certain environmental liabilities are managed through Ardellis; the related assets and liabilities of which are included in the consolidated financial statements as of December 30, 2023 and December 31, 2022. Our policy is to accrue amounts equal to actuarially determined or internally computed liabilities. The actuarial and internal valuations are based on historical information along with certain assumptions about future events. Changes in assumptions for such matters as legal actions, medical cost trends, and changes in claims experience could cause these estimates to change in the future. In addition to providing coverage for the Company, Ardellis provides Excess Loss Insurance (primarily medical and prescription drug) and Excess General Liability and Property Insurance to certain third parties. As of December 30, 2023, Ardellis had 207 such contracts in place. Reserves associated with these contracts were $7.5 million at December 30, 2023, and $5.0 million at December 31, 2022, and are accrued based on third party actuarial valuations of the expected future liabilities. INCOME TAXES Deferred income tax assets and liabilities are computed for differences between the financial statement and tax basis of assets and liabilities that will result in taxable or deductible amounts in the future. Such deferred income tax asset and liability computations are based on enacted tax laws and rates. Valuation allowances are established when necessary to reduce deferred income tax assets to the amounts expected to be realized. Income tax expense is the tax payable or refundable for the period plus or minus the change during the period in deferred income tax assets and liabilities. REVENUE RECOGNITION Within the three primary segments (Retail, Packaging, and Construction) that the Company operates, there are a variety of written agreements governing the sale of our products and services. The transaction price is stated at the purchase order level, which includes shipping and/or freight costs and any applicable governmental authority taxes. The majority of our contracts have a single performance obligation concentrated around the delivery of goods to the carrier, Free On Board (FOB) shipping point. Therefore, revenue is recognized when this performance obligation is satisfied. Generally, title and control passes at the time of shipment. In certain circumstances, the customer takes title when the shipment arrives at the destination. However, our shipping process is typically completed the same day. Certain customer products that we provide require installation by the Company or a third party. Installation revenue is recognized upon completion. If we use a third party for installation, the party will act as an agent to us until completion of the installation. Installation revenue represents an immaterial share of our total net sales. We utilize rebates, credits, discounts and/or cash-based incentives with certain customers which are accounted for as variable consideration. We estimate these amounts based on the expected amount to be provided to customers and reduce revenues recognized. We believe that there will not be significant changes to our estimates of variable consideration. The allocation of these costs are applied at the invoice level and recognized in conjunction with revenue. Additionally, returns and refunds are estimated on a historical and expected basis which is a reduction of revenue recognized. Earnings on construction contracts are reflected in operations using over time accounting, under either cost to cost or units of delivery methods, depending on the nature of the business at individual operations, which is in accordance with ASC 606 as revenue is recognized when certain performance obligations are performed. Under over time accounting using the cost to cost method, revenues and related earnings on construction contracts are measured by the relationships of actual costs incurred relative to the total estimated costs. Under over time accounting using the units of delivery method, revenues and related earnings on construction contracts are measured by the relationships of actual units produced relative to the total number of units. Revisions in earnings estimates on the construction contracts are recorded in the accounting period in which the basis for such revisions becomes known. Projected losses on individual contracts are charged to operations in their entirety when such losses become apparent. Our construction contracts are generally entered into with a fixed price and completion of the projects can range from 6 The following table presents our net sales disaggregated by revenue source (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended ​ December 30, December 31, ​ December 25, 2023 vs. 2022 ​ 2022 vs. 2021 ​ ​ 2023 ​ 2022 ​ 2021 ​ % Change ​ % Change Point in Time Revenue ​ $ 7,069,690 ​ $ 9,442,794 ​ $ 8,512,012 (25.1)% ​ 10.9% Over Time Revenue ​ 148,694 ​ ​ 183,945 ​ ​ 124,122 (19.2)% ​ 48.2% Total Net Sales ​ $ 7,218,384 ​ $ 9,626,739 ​ $ 8,636,134 (25.0)% ​ 11.5% ​ The Construction segment comprises the construction contract revenue shown above. Construction contract revenue is primarily made up of site-built and framing customers. The following table presents the balances of over time accounting accounts on December 30, 2023 and December 31, 2022 which are included in “Other current assets” and “Accrued liabilities: Other”, respectively (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ December 30, ​ December 31, ​ 2023 2022 Cost and Earnings in Excess of Billings $ 3,572 $ 6,798 Billings in Excess of Cost and Earnings ​ 9,487 10,184 ​ SHIPPING AND HANDLING OF PRODUCT Shipping and handling costs that are charged to and reimbursed by the customer are recognized as revenue. Costs incurred related to the shipment and handling of products are classified in cost of goods sold. SHARE-BASED COMPENSATION We account for share-based awards in accordance with ASC Topic 718, Compensation – Stock Compensation EARNINGS PER SHARE Earnings per share (“EPS”) is computed using the two-class method. The two-class method determines EPS for each class of common stock and participating securities according to dividends and their respective participation rights in undistributed earnings. Participating securities include non-vested shares of restricted stock in which the participants have non-forfeitable rights to dividends during the performance period. EPS, basic and diluted, is calculated by dividing net earnings attributable to controlling interest, net of applicable taxes, by the weighted average number of shares of common stock outstanding for the period. The computation of EPS is as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 30, December 31, December 25, ​ ​ 2023 ​ 2022 ​ 2021 Numerator: ​ ​ ​ Net earnings attributable to controlling interest ​ $ 514,312 ​ $ 692,651 ​ $ 535,640 Adjustment for earnings allocated to non-vested restricted common stock equivalents ​ (25,139) ​ (27,488) ​ (17,342) Net earnings for calculating EPS ​ $ 489,173 ​ $ 665,163 ​ $ 518,298 Denominator: ​ ​ ​ Weighted average shares outstanding ​ 62,683 ​ 62,667 ​ 62,209 Adjustment for non-vested restricted common stock equivalents ​ (3,064) ​ (2,487) ​ (2,014) Shares for calculating basic EPS ​ 59,619 ​ 60,180 ​ 60,195 Effect of dilutive restricted common stock equivalents ​ 1,020 ​ 473 ​ 159 Shares for calculating diluted EPS ​ 60,639 ​ 60,653 ​ 60,354 Net earnings per share: ​ ​ ​ Basic ​ $ 8.21 ​ $ 11.05 ​ $ 8.61 Diluted ​ $ 8.07 ​ $ 10.97 ​ $ 8.59 ​ USE OF ACCOUNTING ESTIMATES The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements as well as the reported amounts of revenues and expenses during the reporting period. We believe our estimates to be reasonable; however, actual results could differ from these estimates.

FAIR VALUE

FAIR VALUE	12 Months Ended
	Dec. 30, 2023
FAIR VALUE
FAIR VALUE	B. FAIR VALUE We apply the provisions of ASC 820, Fair Value Measurements and Disclosures, ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 30, 2023 ​ December 31, 2022 ​ ​ Quoted ​ Prices with ​ ​ ​ ​ ​ ​ ​ Quoted ​ Prices with ​ ​ ​ ​ ​ ​ ​ ​ Prices in ​ Other ​ ​ Prices with ​ ​ ​ ​ Prices in ​ Other ​ ​ Prices with ​ ​ ​ ​ ​ Active ​ Observable ​ ​ Unobservable ​ ​ ​ ​ Active ​ Observable ​ ​ Unobservable ​ ​ ​ ​ ​ Markets ​ Inputs ​ ​ Inputs ​ ​ ​ ​ Markets ​ Inputs ​ ​ Inputs ​ ​ ​ ​ (Level 1) (Level 2) ​ (Level 3) ​ Total (Level 1) (Level 2) ​ (Level 3) Total Money market funds ​ $ 492,800 $ 6,133 ​ $ — $ 498,933 $ 390,219 $ 1,286 ​ $ — $ 391,505 Fixed income funds ​ 5,112 ​ 18,976 ​ ​ — 24,088 ​ 2,594 ​ 16,692 ​ ​ — 19,286 Treasury securities ​ ​ 344 ​ ​ — ​ ​ — ​ ​ 344 ​ ​ 343 ​ ​ — ​ ​ — ​ ​ 343 Equity securities ​ 16,411 ​ — ​ ​ 10,500 26,911 ​ 17,337 ​ — ​ ​ — 17,337 Alternative investments ​ ​ — ​ ​ — ​ ​ 4,052 ​ ​ 4,052 ​ ​ — ​ ​ — ​ ​ 4,102 ​ ​ 4,102 Mutual funds: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Domestic stock funds ​ 13,330 ​ — ​ ​ — 13,330 ​ 13,067 ​ — ​ ​ — 13,067 International stock funds ​ 509 ​ — ​ ​ — 509 ​ 1,414 ​ — ​ ​ — 1,414 Target funds ​ 9 ​ — ​ ​ — 9 ​ 8 ​ — ​ ​ — 8 Bond funds ​ 5 ​ — ​ ​ — 5 ​ 130 ​ — ​ ​ — 130 Alternative funds ​ ​ 474 ​ ​ — ​ ​ — ​ ​ 474 ​ ​ 474 ​ ​ — ​ ​ — ​ ​ 474 Total mutual funds ​ 14,327 ​ — ​ ​ — 14,327 ​ 15,093 ​ — ​ ​ — 15,093 Total ​ $ 528,994 ​ $ 25,109 ​ $ 14,552 ​ $ 568,655 ​ $ 425,586 ​ $ 17,978 ​ $ 4,102 ​ $ 447,666 ​ From the assets measured at fair value as of December 30, 2023, listed in the table above, $498.5 million of money market funds are held in Cash and Cash Equivalents, $34.8 million of mutual funds, equity securities, and alternative investments are held in Investments, $10.5 million of equity securities are held in Other Assets, $0.1 million of money market and mutual funds are held in Other Assets for our deferred compensation plan, and $24.4 million of fixed income funds and $0.4 million of money market funds are held in Restricted Investments. As of December 31, 2022, $36.1 million of mutual funds, equity securities, and alternative investments were held in Investments, $391.2 million of money market funds were held in Cash and Cash Equivalents, $0.5 million of money market and mutual funds were held in Other Assets for our deferred compensation plan, and $19.6 million of fixed income funds and $0.3 million of money market funds were held in Restricted Investments. We maintain money market, mutual funds, bonds, and/or equity securities in our non-qualified deferred compensation plan, our wholly owned licensed captive insurance company, and assets held in financial institutions. These funds are valued at prices quoted in an active exchange market and are included in "Cash and Cash Equivalents", "Investments", "Other Assets", and “Restricted Investments.” We have elected not to apply the fair value option under ASC 825, Financial Instruments, During 2023, we made $10.5 million of investments through our Innov8 Fund, which is designed to invest in emerging projects, services, and technologies. These investments are valued as Level 3 assets and are categorized as “Equity securities.” In accordance with our investment policy, our wholly-owned company, Ardellis Insurance Ltd. ("Ardellis"), maintains an investment portfolio, totaling $59.2 million and $55.6 million as of December 30, 2023 and December 31, 2022, respectively, which has been included in the aforementioned table of total investments. This portfolio consists of domestic and international equity securities, alternative investments, and fixed income bonds. Ardellis’ available for sale investment portfolio, including funds held with the State of Michigan, consists of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 30, 2023 ​ December 31, 2022 ​ ​ ​ ​ Unrealized ​ ​ ​ ​ ​ Unrealized ​ ​ ​ Cost Gain (Loss) Fair Value Cost Gain (Loss) Fair Value Fixed income ​ $ 25,514 $ (1,426) $ 24,088 ​ $ 21,399 $ (2,113) $ 19,286 Treasury securities ​ ​ 344 ​ ​ — ​ ​ 344 ​ ​ 343 ​ ​ — ​ ​ 343 Equity ​ 13,523 ​ ​ 2,888 16,411 ​ 15,762 ​ 1,575 17,337 Mutual funds ​ ​ 12,348 ​ ​ 1,934 ​ ​ 14,282 ​ ​ 13,430 ​ ​ 1,144 ​ ​ 14,574 Alternative investments ​ ​ 3,211 ​ ​ 841 ​ ​ 4,052 ​ ​ 3,105 ​ ​ 997 ​ ​ 4,102 Total ​ $ 54,940 ​ $ 4,237 $ 59,177 ​ $ 54,039 ​ $ 1,603 $ 55,642 ​ Our fixed income investments consist of a blend of US Government and Agency bonds and investment grade corporate bonds with varying maturities. Our equity investments consist of small, mid, and large cap growth and value funds, as well as international equity. Our mutual fund investments consist of domestic and international stock. Our alternative investments consist of a private real estate income trust which is valued as a Level 3 asset. The net pre-tax unrealized gain was $4.2 million and $1.6 million as of December 30, 2023 and December 31, 2022. Carrying amounts above are recorded in the investments and restricted investments line items within the balance sheet as of December 30, 2023 and December 31, 2022.

BUSINESS COMBINATIONS AND EQUIT

BUSINESS COMBINATIONS AND EQUITY METHOD INVESTMENTS	12 Months Ended
	Dec. 30, 2023
BUSINESS COMBINATIONS AND EQUITY METHOD INVESTMENTS
BUSINESS COMBINATIONS	C. BUSINESS COMBINATIONS We completed the following business combinations in fiscal 2023 and 2022, which were accounted for using the purchase or equity method (in thousands). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net ​ Company Acquisition ​ Intangible Tangible Operating Name Date Purchase Price Assets Assets Segment ​ September 20, 2023 $52,841 $ 43,785 $ 9,056 International UFP Palets y Embalajes SL (UFP Palets) Headquartered in Castellón, Spain, UFP Palets (formerly known as Palets Suller Group) is the market leader in machine-built wood pallets, serving the region's large ceramic tile industry. The company had trailing 12-month sales of approximately $38 million through August 2023. ​ December 6, 2022 $70,942 $ 48,745 $ 22,197 Packaging Titan Corrugated, Inc. (Titan) and All Boxed Up, LLC (ABU) Located in Flower Mound, TX and founded in 2003, Titan’s primary products include boxes used in moving and storage, jumbo boxes for industrial products, corrugated shipping containers, and point-of-purchase displays. ABU distributes common box sizes manufactured by Titan throughout the United States. The combined companies had trailing 12-month sales through October 2022 of approximately $46.5 million. ​ June 27, 2022 $69,791 $ 34,552 $ 35,239 Packaging Dempsey Wood Products, Inc. (Dempsey) Located in Orangeburg, South Carolina and founded in 1988, Dempsey is a sawmill which produces products such as kiln dried finished lumber, industrial lumber, green cut stock lumber, pine chips and shavings, landscaping mulch, and sawdust. The Company had sales of approximately $69 million in 2021. ​ May 9, 2022 $15,398 $ 4,821 $ 10,577 Retail Cedar Poly, LLC Located in Tipton, Iowa, Cedar Poly is a full-service recycler of high-density and low-density polyethylene (HDPE and LDPE) flakes and pellets used in various products, including composite decking. The company also recycles corrugate and operates its own transportation fleet. Cedar Poly had 2021 sales of approximately $17.3 million and operates in UFP’s Deckorators business unit. ​ December 27, 2021 $24,057 $ 20,390 $ 5,667 Retail Ultra Aluminum Manufacturing, Inc. (Ultra) Located in Howell, Michigan and founded in 1996, Ultra is a leading manufacturer of aluminum fencing, gates and railing. The company designs and produces an extensive selection of ornamental aluminum fence and railing products for contractors, landscapers, fence dealers and wholesalers. The Company had sales of approximately $45 million in 2021. ​ The intangible assets for each acquisition were finalized and allocated to their respective identifiable intangible asset and goodwill accounts during 2023, except for the acquisition of UFP Palets. In aggregate, acquisitions made during 2023 and 2022, contributed approximately $95.0 million in net sales and $3.3 million in operating profit during 2023. We acquired UFP Palets on September 20, 2023, in which we own 80% of the issued equity of that entity, and the remaining 20% of the issued equity is owned by the previous owner (“Seller”). In the fourth quarter of 2023, we gained control over UFP Palets and thus began consolidating this entity. The investment in UFP Palets is accounted for as a business acquisition. Per the contract, the Seller has a put right to sell their equity interest to us and we have a call right to purchase the Seller’s equity interest, which are both first exercisable in September 2026. The values of the put and call options are based upon future performance. As a result of this redemption feature, we recorded redeemable noncontrolling interest, at its acquisition‑date fair value, that is classified as temporary equity in the accompanying consolidated balance sheets at December 30, 2023. The amounts assigned to major intangible classes for the business combinations mentioned above are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Non- ​ ​ ​ ​ ​ ​ ​ ​ Intangibles - ​ ​ Compete ​ ​ ​ ​ ​ Customer ​ ​ ​ ​ ​ ​ Tax ​ ​ Agreements ​ Technology ​ Patents ​ Relationships ​ Tradename ​ Goodwill ​ Deductible UFP Palets ​ $ — ​ $ — ​ $ — ​ $ 36,708 * $ — ​ $ 7,077 * $ 43,785 All Boxed Up ​ ​ — ​ ​ 393 ​ ​ — ​ ​ 864 ​ ​ 29 ​ ​ 628 ​ ​ 1,914 Titan ​ ​ — ​ ​ 9,607 ​ ​ — ​ ​ 21,136 ​ ​ 721 ​ ​ 15,367 ​ ​ 46,831 Cedar Poly ​ ​ 390 ​ ​ — ​ ​ — ​ ​ 2,490 ​ ​ 500 ​ ​ 1,441 ​ ​ 4,821 Ultra ​ ​ — ​ ​ — ​ ​ — ​ ​ 6,820 ​ ​ 5,020 ​ ​ 8,550 ​ ​ 20,390 ​ *(estimate) ​ The business combinations mentioned above were not significant to our operating results individually or in aggregate, and thus pro forma results for 2023 and 2022 are not presented.

GOODWILL AND OTHER INTANGIBLE A

GOODWILL AND OTHER INTANGIBLE ASSETS	12 Months Ended
	Dec. 30, 2023
GOODWILL AND OTHER INTANGIBLE ASSETS
GOODWILL AND OTHER INTANGIBLE ASSETS	D. GOODWILL AND OTHER INTANGIBLE ASSETS As described in Note M — Segment Reporting, our segment structure is based upon the markets we serve and goodwill has been allocated to the segments using a relative fair value approach. The changes in the net carrying amount of goodwill by reporting segment for the years ended December 30, 2023 and December 31, 2022, are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Retail Packaging Construction All Other Corporate Total Balance as of December 25, 2021 $ 73,376 $ 128,541 $ 89,000 $ 24,121 ​ $ — $ 315,038 2022 Acquisitions ​ 10,971 ​ ​ 23,862 ​ ​ — ​ ​ — ​ ​ — ​ 34,833 2022 Purchase Accounting Adjustments ​ ​ 293 ​ ​ (3,494) ​ ​ (1,074) ​ ​ (4,766) ​ ​ — ​ ​ (9,041) 2022 Impairments ​ ​ — ​ ​ — ​ ​ — ​ ​ (2,480) ​ ​ — ​ ​ (2,480) Foreign Exchange, Net ​ — ​ ​ — ​ ​ (256) ​ ​ (774) ​ ​ — ​ (1,030) Balance as of December 31, 2022 $ 84,640 $ 148,909 $ 87,670 $ 16,101 ​ $ — $ 337,320 2023 Acquisitions ​ — ​ ​ — ​ ​ — ​ ​ 7,077 ​ ​ — ​ 7,077 2023 Purchase Accounting Adjustments ​ ​ (979) ​ ​ (7,867) ​ ​ — ​ ​ — ​ ​ — ​ ​ (8,846) Foreign Exchange, Net ​ — ​ ​ — ​ ​ 135 ​ ​ 627 ​ ​ — ​ 762 Balance as of December 30, 2023 ​ $ 83,661 $ 141,042 ​ $ 87,805 ​ $ 23,805 ​ $ — ​ $ 336,313 ​ As of the date of the most recent goodwill impairment test, which utilized data and assumptions as of September 30, 2023, all reporting units had fair values that were substantially in excess of their carrying values. During 2022, we experienced significantly lower than expected operating results within our Italian reporting unit, which is within the all other segment. It was determined that the carrying value of the reporting unit exceeded its fair value and as a result, we recorded a non-cash goodwill impairment charge of $2.5 million as of December 31, 2022, which represented the entire amount of the goodwill recorded within the reporting unit. Subsequently, the Italian reporting unit was divested in 2023. Indefinite-lived intangible assets totaled $7.3 million as of December 30, 2023 and December 31, 2022 related to the commercial unit within the construction segment, the international unit within the all other segment, and the Deckorators unit within the retail segment. The following amounts were included in other amortizable intangible assets, net as of December 30, 2023 and December 31, 2022 (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ 2022 ​ ​ ​ Accumulated ​ ​ ​ ​ Accumulated ​ ​ ​ ​ Assets ​ Amortization ​ Net Value ​ Assets ​ Amortization ​ Net Value Non-compete agreements ​ $ 9,886 ​ $ (5,966) ​ $ 3,920 ​ $ 12,577 ​ $ (7,109) ​ $ 5,468 Customer relationships and other ​ 171,029 ​ (43,403) ​ ​ 127,626 ​ 139,112 ​ (34,646) ​ ​ 104,466 Licensing agreements ​ — ​ — ​ ​ — ​ 4,589 ​ (4,589) ​ ​ — Patents ​ 1,622 ​ (898) ​ ​ 724 ​ 1,976 ​ (1,104) ​ ​ 872 Technology ​ ​ 12,600 ​ ​ (2,173) ​ ​ 10,427 ​ ​ 2,600 ​ ​ (875) ​ ​ 1,725 Tradename ​ ​ 39,831 ​ ​ (12,320) ​ ​ 27,511 ​ ​ 38,826 ​ ​ (8,393) ​ ​ 30,433 Software ​ ​ 7,666 ​ ​ (2,679) ​ ​ 4,987 ​ ​ 1,788 ​ ​ (860) ​ ​ 928 Total ​ $ 242,634 ​ $ (67,439) ​ $ 175,195 ​ $ 201,468 ​ $ (57,576) ​ $ 143,892 ​ Amortization is computed principally by the straight-line method over the estimated useful lives of the intangible assets as follows: ​ ​ ​ ​ ​ ​ ​ ​ Weighted Average Intangible Asset Type ​ Estimated Useful Life ​ Amortization Period Non-compete agreements 2 to 15 years 7.5 years Customer relationships and other 5 to 15 years 10.4 years Licensing agreements 10 years 10 years Patents ​ 10 years ​ 10 years Technology ​ 5 to 12 years ​ 9.5 years Tradename (amortizable) 5 to 25 years 10.9 years Software ​ 3 to 5 years ​ 3 years ​ Amortization expense of intangibles totaled $21.3 million, $19.5 million and $13.9 million in 2023, 2022 and 2021, respectively. The estimated amortization expense for intangibles for each of the five succeeding fiscal years is as follows (in thousands): ​ ​ ​ ​ 2024 $ 23,580 2025 ​ 22,998 2026 ​ 20,520 2027 ​ 18,636 2028 ​ 18,021 Thereafter ​ 71,440 Total ​ $ 175,195 ​

DEBT

DEBT	12 Months Ended
	Dec. 30, 2023
DEBT
DEBT	E. DEBT On November 1, 2018, we entered into a five-year, $375 million unsecured revolving credit facility with a syndicate of U.S. banks. On February 28, 2021, this credit On August 10, 2020, we entered into an unsecured Note Purchase Agreement under which we issued our 3.04% Series 2020 E Senior Notes, due August 10, 2032, in the aggregate principal amount of $50 million, our 3.08% Series 2020 F Senior Notes, due August 10, 2033, in the aggregate principal amount of $50 million, and our 3.15% Series 2020 G Senior Notes, due August 10, 2035, in the aggregate principal amount of $50 million. Outstanding letters of credit extended on our behalf on December 30, 2023 and December 31, 2022 aggregated $47.8 million and $59.0 million. These letters of credit are comprised of $37.3 million issued under the revolving credit facility, including approximately $3.3 million related to industrial development revenue bonds, and $10.5 million issued outside of the facility. We had an outstanding balance on the revolver of $3.7 million and $5.5 million, which includes foreign subsidiary borrowings at December 30, 2023, and December 31, 2022, respectively. After considering letters of credit, we had $709.0 million and $741.2 million in remaining availability on the revolver on December 30, 2023, and December 31, 2022, respectively. Letters of credit have one-year terms, include an automatic renewal clause, and are charged an annual interest rate of 112.5 to 122.5 basis points, based upon our financial performance. Long-term debt obligations are summarized as follows on December 30, 2023 and December 31, 2022 (amounts in thousands): ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 Series 2020 Senior Notes E, due on August 10, 2032, interest payable semi-annually at 3.04% ​ $ 50,000 ​ $ 50,000 Series 2020 Senior Notes F, due on August 10, 2033, interest payable semi-annually at 3.08% ​ ​ 50,000 ​ ​ 50,000 Series 2020 Senior Notes G, due on August 10, 2035, interest payable semi-annually at 3.15% ​ ​ 50,000 ​ ​ 50,000 Series 2018 Senior Notes C, due on June 14, 2028, interest payable semi-annually at 4.20% ​ ​ 40,000 ​ ​ 40,000 Series 2018 Senior Notes D, due on June 14, 2030, interest payable semi-annually at 4.27% ​ 35,000 ​ 35,000 Series 2012 Senior Notes Tranche B, due on December 17, 2024, interest payable semi-annually at 3.98% ​ 40,000 ​ 40,000 Foreign subsidiary borrowings under revolving credit facility, due on December 6, 2027, interest payable monthly at a floating rate (5.44% on December 30, 2023 and 4.13% on December 31, 2022) ​ ​ 3,692 ​ ​ 5,465 Series 1999 Industrial Development Revenue Bonds, due on August 1, 2029, interest payable monthly at a floating rate (3.33% on December 30, 2023 and 1.04% on December 31, 2022) ​ 3,300 ​ 3,300 Finance leases and foreign affiliate debt ​ 4,592 ​ 4,565 ​ ​ 276,584 ​ 278,330 Less current portion ​ (42,900) ​ (2,942) Less debt issuance costs ​ (150) ​ (234) Long-term portion ​ $ 233,534 ​ $ 275,154 ​ Financial covenants on the unsecured revolving credit facility and unsecured notes include minimum interest coverage tests and a maximum leverage ratio. The agreements also restrict the amount of additional indebtedness we may incur and the amount of assets which may be sold among other industry standard covenants. We were within all of our lending requirements on December 30, 2023 and December 31, 2022. On December 30, 2023, the principal maturities of long-term debt and finance lease obligations are as follows (in thousands): ​ ​ ​ ​ 2024 $ 42,823 2025 ​ 640 2026 ​ 186 2027 ​ 3,896 2028 ​ 40,223 Thereafter ​ 188,666 Total ​ $ 276,434 ​ On December 30, 2023, the estimated fair value of our long-term debt, including the current portion, was $241.4 million, which was $35.1 million less than the carrying value. The estimated fair value is based on rates anticipated to be available to us for debt with similar terms and maturities. We consider the valuations of our long-term debt, including the current portion, to be Level 2 liabilities which rely on quoted prices in markets that are not active or observable inputs over the full term of the liability.

LEASES

LEASES	12 Months Ended
	Dec. 30, 2023
LEASES
LEASES	F. LEASES We determine if an arrangement is a lease at inception. We lease certain real estate under non-cancelable operating lease agreements with typical original terms ranging from one renewal five equipment and aircraft operating one ​ We believe finance leases have no significant impact to our consolidated balance sheet and statement of earnings as of December 30, 2023. ​ As of December 30, 2023, we have no leases that have not yet commenced that would significantly impact the rights, obligations, and our financial position. ​ There were no lease transactions between related parties as of December 30, 2023. The rates implicit in our leases are primarily not readily available. To determine the discount rate used to present value the lease payments, we utilize the 7-year treasury note rate plus a blend of rate spreads associated with our 10 to 15 year senior notes along with estimated spreads based on current market conditions. We feel the determined rate is a reasonable representation of our lease population. ​ Lease costs under non-cancelable operating leases on December 30, 2023 and December 31, 2022 are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ ​ 2022 Operating lease cost ​ $ 33,829 ​ $ 32,458 Short-term lease cost ​ 9,525 ​ 10,490 Variable lease cost ​ 6,332 ​ 5,291 Sublease income ​ (2,267) ​ (2,876) Total lease cost ​ $ 47,419 ​ $ 45,363 ​ Rent expense was approximately $49.7 million, $48.2 million, and $40.1 million in 2023, 2022, and 2021, respectively. The amounts paid for operating leases, included in the measurement of lease liabilities, were $32.4 million in the year ended December 30, 2023 and $30.2 million in the year ended December 31, 2022. In addition, right-of-use assets obtained in exchange for new operating lease liabilities were approximately $35.4 million and $32.0 million, respectively, for the years ended December 30, 2023 and December 31, 2022. ​ Future minimum payments under non-cancelable operating leases on December 30, 2023 are as follows (in thousands): ​ ​ ​ ​ ​ Operating ​ ​ Leases 2024 ​ $ 32,796 2025 ​ 29,435 2026 ​ 27,104 2027 ​ 17,998 2028 ​ 13,517 Thereafter ​ 31,686 Total minimum lease payments ​ $ 152,536 Less present value discount ​ ​ (44,674) Total lease liability ​ $ 107,862 ​ As of December 30, 2023 and December 31, 2022, the weighted average lease term for operating leases was 7.21 years and 6.78 years, respectively. Similarly, the weighted average discount rate for operating leases was 4.53% and 3.70%, respectively.

DEFERRED COMPENSATION

DEFERRED COMPENSATION	12 Months Ended
	Dec. 30, 2023
DEFERRED COMPENSATION
DEFERRED COMPENSATION	G. DEFERRED COMPENSATION We have a program whereby certain executives irrevocably elected to defer receipt of certain compensation in 1985 through 1988. Deferred compensation payments to these executives commenced upon their retirement. There was no remaining deferred compensation liability on December 30, 2023 and the remaining deferred compensation liability on December 31, 2022 was $0.1 million. We purchased life insurance on these executives, payable to us in amounts which, if assumptions made as to mortality experience, policy dividends, and other factors are realized, will accumulate cash values adequate to reimburse us for all payments for insurance and deferred compensation obligations. The investment in life insurance contracts as of December 30, 2023 and December 31, 2022, was $12.2 million and $11.6 million, respectively, and is recorded in “Other Assets” on the Consolidated Balance Sheet. We also maintain a non-qualified deferred compensation plan (the "Plan") for the benefit of senior management employees who may elect to defer a portion of their annual bonus payments and salaries. The Plan provides investment options similar to our 401(k) plan, including our stock. The investment in our stock is funded by the issuance of shares to a Rabbi trust, and may only be distributed in kind. Assets held by the Plan totaled approximately

COMMON STOCK

COMMON STOCK	12 Months Ended
	Dec. 30, 2023
COMMON STOCK
COMMON STOCK	H. COMMON STOCK We maintain and administer our shareholder approved Employee Stock Purchase Plan. The Employee Stock Purchase Plan allows eligible employees to purchase shares of our stock at a share price equal to 85% of fair market value on the purchase date. We have expensed the fair value of the compensation associated with these awards, which approximates the discount. The amount of expense is nominal. We maintain and administer our shareholder approved Director Compensation Plan. The Director Compensation Plan allows eligible members of the Board of Directors to defer the cash portion of their retainer and committee fees, credited in the form of stock units, and receive shares of our stock at the time of or following their retirement, disability or death. The number of shares to be received is equal to the amount of the cash portion of their retainer and committee fees deferred multiplied by 110%, divided by the fair market value of a share of our stock at the time of deferral. The number of units is increased by the amount of dividends paid on our common stock. The units are immediately vested as of the grant date, since they are considered payment for services rendered quarterly. We recognized expense for this plan of $1.9 million in 2023, $2.0 million in 2022, and $1.7 million in 2021. Effective January 1, 2017, this plan was amended to allow directors to defer payment of the annual retainer paid in the form of our common stock. The number of shares to be received for their portion of the retainer that is deferred is equal to the amount of shares plus the number of shares attributable to cash dividends payable on those deferred shares. Finally, we maintain and administer our shareholder approved Long Term Stock Incentive Plan (the "LTSIP”). The LTSIP provides for the grant of stock options, stock appreciation rights, restricted stock, performance shares, sales incentive awards, and other stock-based awards. Executive Stock Match awards are granted in the year following the requisite service period, which begins at the beginning of each fiscal year, and fully vest on the fifth anniversary of the grant date. Refer to Notes to Consolidated Financial Statements, Note G, "Deferred Compensation" for additional information on the “Plan”. There is no unrecognized compensation expense remaining for stock options in 2023, 2022, and 2021. Below is a summary of common stock issuances for 2023 and 2022 (in thousands, except per share data): ​ ​ ​ ​ ​ ​ ​ December 30, 2023 Share Issuance Activity Common Stock ​ ​ Average Share Price Shares issued under the employee stock purchase plan ​ 33 ​ $ 98.20 ​ ​ ​ ​ ​ ​ Shares issued under the employee stock gift program ​ 2 ​ ​ 95.42 Shares issued under the director compensation plan ​ 3 ​ ​ 92.82 Shares issued under the LTSIP ​ 756 ​ ​ 86.14 Shares issued under the executive stock match plan ​ 75 ​ ​ 85.89 Forfeitures ​ (15) ​ ​ ​ Total shares issued under stock grant programs ​ 821 ​ $ 86.16 ​ ​ ​ ​ ​ ​ Shares issued under the deferred compensation plans ​ 124 ​ $ 88.43 ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 Share Issuance Activity Common Stock ​ ​ Average Share Price Shares issued under the employee stock purchase plan ​ 44 ​ $ 73.45 ​ ​ ​ ​ ​ ​ Shares issued under the employee stock gift program ​ 2 ​ ​ 78.23 Shares issued under the director retainer stock program ​ 4 ​ ​ 79.98 Shares issued under the LTSIP ​ 755 ​ ​ 82.73 Shares issued under the executive stock grants plan ​ 62 ​ ​ 82.87 Forfeitures ​ (17) ​ ​ ​ Total shares issued under stock grant programs ​ 806 ​ $ 82.71 ​ ​ ​ ​ ​ ​ Shares issued under the deferred compensation plans ​ 113 ​ $ 81.86 ​ A summary of the nonvested restricted stock awards granted under the LTSIP is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted- ​ ​ ​ ​ ​ ​ ​ Unrecognized ​ Average ​ ​ ​ ​ Weighted- ​ Compensation ​ Period to ​ ​ Restricted ​ Average Grant ​ Expense ​ Recognize ​ ​ Awards ​ Date Fair Value ​ (in millions) ​ Expense Nonvested at December 26, 2020 1,363,794 $ 35.14 $ 6.3 0.62 years Granted 560,516 ​ 60.24 ​ Vested (274,271) ​ 26.50 ​ Forfeited (23,007) ​ 39.68 ​ Nonvested at December 25, 2021 1,627,032 $ 45.23 $ 6.6 0.43 years Granted 815,874 ​ 79.97 ​ Vested (286,661) ​ 34.00 ​ Forfeited (17,990) ​ 54.07 ​ Nonvested at December 31, 2022 2,138,255 ​ $ 58.70 ​ $ 51.4 3.74 years Granted 830,346 ​ 86.11 ​ Vested (233,763) ​ 40.50 ​ Forfeited (14,001) ​ 63.54 ​ Nonvested at December 30, 2023 2,720,837 ​ $ 68.61 ​ $ 76.9 3.68 years ​ Under the Stock Purchase Plan and LTSIP, we recognized share-based compensation expense of $34.9 million, $28.2 million, and $11.2 million and the related total income tax benefits of $8.2 million, $6.9 million, and $2.7 million in 2023, 2022 and 2021, respectively. For the year-ended December 30, 2023, we determined that $28.9 million of share-based bonus awards, representing 254,746 shares, will be awarded to qualified employees as it relates to the Company’s 2023 performance and granted in 2024 under the LTSIP. Awards granted generally vest after a period of three five We have a Sales Incentive Plan for certain eligible employees. Under this plan, sales incentives are determined and calculated using a formula-based approach and estimated monthly based on specific performance metrics. This Plan places a cap on cash payments with the remaining earned incentive being settled in share-based awards. For the year-ended December 30, 2023, we determined that $5.9 million of share-based sales incentive awards, representing 51,802 shares, will be awarded to qualified employees based on the 2023 performance year and granted in 2024. These awards will vest after a period of five years from the grant date. As of December 30, 2023 and December 31, 2022, we recognized approximately $1.0 million and $0.9 million of compensation expense related to share-based sales incentive awards for each of those respective performance years.‬ In 2023, 2022 and 2021, cash received from share issuances under our plans was $2.7 million, $2.8 million and $2.1 million, respectively. During 2023, we repurchased 974,869 shares of our common stock at an average share price of $84.27. During 2022, we repurchased approximately 1,246,616 shares of our common stock at an average share price of $76.83. Effective July 26, 2023, our board authorized the repurchase of up to $200 million worth of shares of outstanding stock through July 31, 2024. This share authorization supersedes and replaces our prior share repurchase authorizations. We currently have remaining authorization to repurchase up to $173 million through July 31, 2024.

RETIREMENT PLANS

RETIREMENT PLANS	12 Months Ended
	Dec. 30, 2023
RETIREMENT PLANS
RETIREMENT PLANS	I. RETIREMENT PLANS We have a profit sharing and 401(k) plan for the benefit of substantially all of our employees, excluding the employees of certain wholly-owned subsidiaries. Amounts contributed to the plan are made at the discretion of the Board of Directors. We matched 25% of employee contributions in 2023, 2022, and 2021, on a discretionary basis, totaling $8.8 million, $11.7 million, and $9.2 million respectively. Included within the total employee matched contribution was an additional matched contribution for hourly employees of $1.8 million, $4.6 million and $3.7 million for 2023, 2022 and 2021, respectively, based on meeting certain performance goals during those years. The basis for matching contributions may not exceed the lesser of 6% of the employee’s annual compensation or the IRS limitation. We maintain a retirement plan for certain officers of the Company (who have at least 20 years of service with the Company and at least 10 years of service as an officer) whereby we will pay, upon retirement, certain benefits including health care benefits, for a specified period of time if certain eligibility requirements are met. Approximately $15.5 million and $14.8 million are accrued in “Other Liabilities” for this plan on December 30, 2023 and December 31, 2022, respectively.

INCOME TAXES

INCOME TAXES	12 Months Ended
	Dec. 30, 2023
INCOME TAXES
INCOME TAXES	J. INCOME TAXES Income tax provisions for the years ended December 30, 2023, December 31, 2022, and December 25, 2021 are summarized as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ 2022 2021 Currently Payable: ​ ​ ​ Federal ​ $ 123,257 ​ $ 181,029 ​ $ 115,077 State and local ​ 28,580 ​ 44,646 ​ 30,441 Foreign ​ 10,808 ​ 17,336 ​ 21,095 ​ ​ 162,645 ​ 243,011 ​ 166,613 Net Deferred: ​ ​ ​ Federal ​ (2,249) ​ (8,561) ​ 6,242 State and local ​ (3,223) ​ (3,657) ​ 118 Foreign ​ (389) ​ (941) ​ 999 ​ ​ (5,861) ​ (13,159) ​ 7,359 Total income tax expense ​ $ 156,784 ​ $ 229,852 ​ $ 173,972 ​ The components of earnings before income taxes consist of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 U.S. ​ $ 633,816 ​ $ 876,071 ​ $ 645,316 Foreign ​ 37,425 ​ 58,745 ​ 81,020 Total ​ $ 671,241 ​ $ 934,816 ​ $ 726,336 ​ The effective income tax rates are different from the statutory federal income tax rates for the following reasons: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 Statutory federal income tax rate 21.0 % 21.0 % 21.0 % State and local taxes (net of federal benefits) 3.6 3.4 3.3 ​ Tax credits, including foreign tax credit (0.9) (0.8) (0.6) ​ Change in uncertain tax positions reserve 0.2 (0.1) (0.1) ​ Other permanent differences 0.2 0.1 (0.4) ​ Other, net (0.7) 1.0 0.7 ​ Effective income tax rate 23.4 % 24.6 % 23.9 % ​ Temporary differences which give rise to deferred income tax assets and (liabilities) on December 30, 2023 and December 31, 2022 are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 Employee benefits ​ $ 45,661 ​ $ 37,893 Lease liability ​ ​ 27,918 ​ ​ 28,746 Net operating loss carryforwards ​ 7,881 ​ 6,891 Foreign subsidiary capital loss carryforward ​ 935 ​ 500 Other tax credits ​ 31 ​ 102 Inventory ​ 2,397 ​ 3,732 Reserves on receivables ​ 2,203 ​ 3,273 Accrued expenses ​ 3,373 ​ 6,791 Capitalized research and development costs ​ ​ 28,021 ​ ​ 11,080 Gross deferred income tax assets ​ 118,420 ​ 99,008 Valuation allowance ​ (6,014) ​ (4,618) Deferred income tax assets ​ 112,406 ​ 94,390 Depreciation ​ (82,617) ​ (69,711) Intangibles ​ (43,455) ​ (43,643) Right of use assets ​ ​ (26,870) ​ ​ (27,849) Other, net ​ (484) ​ (702) Deferred income tax liabilities ​ (153,426) ​ (141,905) Net deferred income tax liability ​ $ (41,020) ​ $ (47,515) ​ As of December 30, 2023, we had federal, state and foreign net operating loss carryforwards of $7.9 million and state tax credit carryforwards of $0.1 million, which will expire at various dates. The NOL and credit carryforwards expire as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net Operating Losses ​ Tax Credits ​ U.S. State Foreign U.S. State 2024 - 2028 ​ $ — ​ $ 27 ​ $ 206 ​ $ — ​ $ — 2029 - 2033 ​ — ​ ​ 396 ​ ​ 1,268 ​ — ​ — 2034 - 2038 ​ — ​ ​ 1,618 ​ ​ 1,656 ​ — ​ 31 2039 - 2043 ​ 208 ​ ​ 1,373 ​ ​ — ​ — ​ — Thereafter ​ — ​ ​ — ​ ​ 570 ​ — ​ — Total ​ $ 208 ​ $ 3,414 ​ $ 3,700 ​ $ — ​ $ 31 ​ As of December 30, 2023, we believe that it is more likely than not that the benefit from certain state and foreign NOL carryforwards will not be realized. In recognition of this risk, we have provided a valuation allowance of $5.5 million against the various NOLs. Furthermore, there is a valuation allowance of $0.5 million against a capital loss carryforward we have for a wholly-owned subsidiary, UFP Canada, Inc. Based upon the business activity and the nature of the assets of this subsidiary, our ability to realize a future benefit from this carryforward is doubtful. The capital loss has an unlimited carryforward and therefore will not expire unless there is a change in control of the subsidiary. ​ The Organization of Economic Cooperation and Development (“OECD”) reached an agreement among various countries to implement a minimum 15% tax rate on certain multinational enterprises, commonly referred to as Pillar Two. Many countries continue to announce changes in their tax laws, many of them effective for tax years beginning Jan 1, 2024. We continue to analyze the impacts of these legislative changes to our effective tax rate, consolidated financial statements, and related disclosures. As of Dec 30, 2023, we do not expect the impact of Pillar Two legislation to have a material impact on our tax expense.

ACCOUNTING FOR UNCERTAINTY IN I

ACCOUNTING FOR UNCERTAINTY IN INCOME TAXES	12 Months Ended
	Dec. 30, 2023
ACCOUNTING FOR UNCERTAINTY IN INCOME TAXES
ACCOUNTING FOR UNCERTAINTY IN INCOME TAXES	K. ACCOUNTING FOR UNCERTAINTY IN INCOME TAXES ASC 740, Income Taxes A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 Gross unrecognized tax benefits beginning of year ​ $ 3,217 ​ $ 3,603 ​ $ 3,892 (Decrease) increase in tax positions for prior years ​ 943 ​ (216) ​ 437 Increase in tax positions for current year ​ 1,286 ​ 764 ​ 839 Lapse in statute of limitations ​ (675) ​ (934) ​ (1,565) Gross unrecognized tax benefits end of year ​ $ 4,771 ​ $ 3,217 ​ $ 3,603 ​ Our effective tax rate would have been affected by the unrecognized tax benefits had this amount been recognized as a reduction to income tax expense. We recognized interest and penalties for unrecognized tax benefits in our provision for income taxes. The liability for unrecognized tax benefits included accrued interest and penalties of $0.4 million for the year December 30, 2023, $0.3 million for the year December 31, 2022, and $0.5 million for the year December 25, 2021. We file income tax returns in the United States and in various state, local and foreign jurisdictions. The federal and a majority of state and foreign jurisdictions are no longer subject to income tax examinations for years before 2019. A number of routine state and local examinations are currently ongoing. Due to the potential for resolution of state examinations, the expiration of various statutes of limitation, and new positions that may be taken, it is reasonably possible that the amount of unrecognized tax benefits that would reverse through the income statement in the next twelve months is $1.2 million.

COMMITMENTS, CONTINGENCIES, AND

COMMITMENTS, CONTINGENCIES, AND GUARANTEES	12 Months Ended
	Dec. 30, 2023
COMMITMENTS, CONTINGENCIES, AND GUARANTEES
COMMITMENTS, CONTINGENCIES, AND GUARANTEES	L. COMMITMENTS, CONTINGENCIES, AND GUARANTEES We are self-insured for environmental impairment liability, including certain liabilities which are insured through a wholly owned subsidiary, Ardellis Insurance Ltd., a licensed captive insurance company. In addition, on December 30, 2023, we were parties either as plaintiff or defendant to a number of lawsuits and claims arising through the normal course of our business. In the opinion of management, our consolidated financial statements will not be materially affected by the outcome of these contingencies and claims. On December 30, 2023, we had outstanding purchase commitments on commenced capital projects of approximately $82.9 million. We provide a variety of warranties for products we manufacture. Historically, warranty claims have not been material. We distribute products manufactured by other companies. While we do not warrant these products, we have received claims as a distributor of these products when the manufacturer no longer exists or has the ability to pay. Historically, these costs have not had a material effect on our consolidated financial statements. As part of our operations, we supply building materials and labor to site-built construction projects or we jointly bid on contracts with framing companies for such projects. In some instances we are required to post payment and performance bonds to insure the project owner that the products and installation services are completed in accordance with our contractual obligations. We have agreed to indemnify the surety for claims made against the bonds. As of December 30, 2023, we had approximately $20.9 million in outstanding payment and performance bonds for open projects. We had approximately $6.9 million in payment and performance bonds outstanding for completed projects which are still under warranty. On December 30, 2023, we had outstanding letters of credit totaling $47.8 million, primarily related to certain insurance contracts, industrial development revenue bonds, and other debt agreements described further below. In lieu of cash deposits, we provide irrevocable letters of credit in favor of our insurers and other third parties to guarantee our performance under certain insurance contracts and other legal agreements. As of December 30, 2023, we have irrevocable letters of credit outstanding totaling approximately $44.5 million for these types of arrangements. We have reserves recorded on our balance sheet, in accrued liabilities, that reflect our expected future liabilities under those insurance arrangements. We are required to provide irrevocable letters of credit in favor of the bond trustees for all industrial development revenue bonds that have been issued. These letters of credit guarantee principal and interest payments to the bondholders. We currently have irrevocable letters of credit outstanding totaling approximately $3.3 million related to our outstanding industrial development revenue bonds. These letters of credit have varying terms but may be renewed at the option of the issuing banks. Certain wholly owned domestic subsidiaries have guaranteed the indebtedness of UFP Industries, Inc. in certain debt agreements, including the Series 2012, 2018 and 2020 Senior Notes and our revolving credit facility. The maximum exposure of these guarantees is limited to the indebtedness outstanding under these debt arrangements and this exposure will expire concurrent with the expiration of the debt agreements. We did not enter into any new guarantee arrangements during 2023 which would require us to recognize a liability on our balance sheet.

SEGMENT REPORTING

SEGMENT REPORTING	12 Months Ended
	Dec. 30, 2023
SEGMENT REPORTING
SEGMENT REPORTING	M. SEGMENT REPORTING ASC 280, Segment Reporting (“ASC 280”), defines operating segments as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker in deciding how to allocate resources and in assessing performance. We operate manufacturing, treating and distribution facilities internationally, but primarily in the United States. Our business segments consist of UFP Retail Solutions, UFP Packaging and UFP Construction and align with the end markets we serve. This segment structure allows for a specialized and consistent sales approach among Company operations, efficient use of resources and capital, and quicker introduction of new products and services. We manage the operations of our individual locations primarily through a market-centered reporting structure under which each location is included in a business unit and business units are included in our Retail, Packaging, and Construction segments. In the case of locations which serve multiple segments, results are allocated and accounted for by segment. Two customers, The Home Depot and Lowes, accounted for approximately 17% and 12%, respectively, of our total net sales in fiscal 2023, 15% and 11%, respectively, of our total net sales in fiscal 2022 and 16% and 10%, respectively, in 2021. The exception to this market-centered reporting and management structure is our International segment, which comprises our Mexico, Canada, Europe, Asia, and Australia operations and sales and buying offices in other parts of the world and our Ardellis segment, which represents our wholly owned fully licensed captive insurance company based in Bermuda. Our International and Ardellis segments do not meet the quantitative thresholds in order to be separately reported and accordingly, the International and Ardellis segments have been aggregated in the “All Other” segment for reporting purposes. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ All ​ ​ ​ ​ ​ ​ ​ Retail Packaging Construction Other Corporate Total Net sales to outside customers ​ $ 2,886,515 ​ $ 1,838,200 ​ $ 2,161,059 ​ $ 328,884 ​ $ 3,726 ​ $ 7,218,384 Intersegment net sales ​ 565,325 ​ 83,549 ​ 96,729 ​ 268,210 ​ (1,013,813) ​ — Interest expense (1) ​ 111 ​ 7 ​ — ​ (3,020) ​ 15,744 ​ 12,842 Amortization expense ​ 4,566 ​ ​ 8,849 ​ ​ 2,904 ​ ​ 3,488 ​ ​ 1,520 ​ 21,327 Depreciation expense ​ 23,943 ​ ​ 32,996 ​ ​ 19,546 ​ ​ 3,994 ​ ​ 30,084 ​ 110,563 Segment earnings before income taxes ​ 167,955 ​ 193,563 ​ 243,357 ​ 37,573 ​ 28,793 ​ 671,241 Segment assets ​ 781,005 ​ ​ 798,623 ​ ​ 621,762 ​ ​ 364,274 ​ ​ 1,452,133 ​ 4,017,797 Capital expenditures ​ 52,756 ​ ​ 52,694 ​ ​ 56,793 ​ ​ 1,432 ​ ​ 16,707 ​ 180,382 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ All ​ ​ ​ ​ ​ ​ ​ Retail Packaging Construction Other Corporate Total Net sales to outside customers ​ $ 3,650,639 ​ $ 2,394,681 ​ $ 3,143,868 ​ $ 431,611 ​ $ 5,940 ​ $ 9,626,739 Intersegment net sales ​ 392,740 ​ 78,409 ​ 110,523 ​ 421,406 ​ (1,003,078) ​ — Interest expense (1) ​ 177 ​ (2) ​ — ​ (1,310) ​ 15,045 ​ 13,910 Amortization expense ​ 4,131 ​ 6,925 ​ 3,358 ​ 4,571 ​ 514 ​ 19,499 Depreciation expense ​ 19,898 ​ 28,191 ​ 15,364 ​ 2,992 ​ 27,618 ​ 94,063 Segment earnings before income taxes ​ 150,165 ​ 333,087 ​ 397,446 ​ 56,813 ​ (2,695) ​ 934,816 Segment assets ​ 889,417 ​ ​ 885,878 ​ ​ 712,837 ​ ​ 308,688 ​ ​ 875,253 ​ 3,672,073 Capital expenditures ​ 55,806 ​ ​ 55,129 ​ ​ 54,167 ​ ​ 3,968 ​ ​ 5,054 ​ 174,124 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ All ​ ​ ​ ​ ​ ​ ​ Retail Packaging Construction Other Corporate Total Net sales to outside customers ​ $ 3,418,337 ​ $ 2,148,142 ​ $ 2,698,434 ​ $ 362,473 ​ $ 8,748 ​ $ 8,636,134 Intersegment net sales ​ 214,400 ​ 85,954 ​ 82,026 ​ 455,874 ​ (838,254) ​ — Interest expense (1) ​ 98 ​ 12 ​ 1 ​ 184 ​ 13,519 ​ 13,814 Amortization expense ​ 2,780 ​ 6,093 ​ 3,525 ​ 1,336 ​ 214 ​ 13,948 Depreciation expense ​ 16,955 ​ 26,219 ​ 13,151 ​ 2,094 ​ 25,765 ​ 84,184 Segment earnings before income taxes ​ 124,790 ​ 264,958 ​ 264,238 ​ 80,905 ​ (8,555) ​ 726,336 Segment assets ​ 844,189 ​ ​ 741,672 ​ ​ 736,157 ​ ​ 343,363 ​ ​ 579,890 ​ 3,245,271 Capital expenditures ​ 40,408 ​ ​ 42,652 ​ ​ 22,344 ​ ​ 5,140 ​ ​ 40,622 ​ 151,166 (1) ​ Information regarding principal geographic areas was as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ 2022 ​ 2021 ​ ​ ​ ​ ​ Long-Lived ​ ​ ​ ​ Long-Lived ​ ​ ​ ​ Long-Lived ​ ​ ​ ​ ​ Tangible ​ ​ ​ ​ Tangible ​ ​ ​ ​ Tangible ​ Net Sales Assets Net Sales Assets Net Sales Assets United States ​ $ 6,935,431 ​ $ 779,748 ​ $ 9,254,676 ​ $ 770,921 ​ $ 8,395,737 ​ $ 679,757 Foreign ​ 282,953 ​ ​ 188,042 ​ ​ 372,063 ​ ​ 126,840 ​ ​ 240,397 ​ ​ 54,873 Total ​ $ 7,218,384 ​ $ 967,790 ​ $ 9,626,739 ​ $ 897,761 ​ $ 8,636,134 ​ $ 734,630 ​ The following table presents, for the periods indicated, our disaggregated net sales (in thousands) by business unit for each segment. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 Retail ​ ​ ​ ​ ​ ​ ​ ​ ​ Deckorators ​ $ 309,419 ​ $ 326,011 ​ $ 248,765 ProWood ​ 2,494,362 ​ 3,152,950 ​ 3,013,620 UFP Edge ​ 81,603 ​ 168,190 ​ 148,927 Other ​ 1,131 ​ 3,488 ​ 7,025 Total Retail ​ $ 2,886,515 ​ $ 3,650,639 ​ $ 3,418,337 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Packaging (1) ​ ​ ​ ​ ​ ​ ​ ​ ​ Structural Packaging ​ $ 1,225,204 ​ $ 1,716,021 ​ $ 1,554,857 PalletOne ​ ​ 530,642 ​ ​ 628,969 ​ ​ 574,466 Protective Packaging ​ ​ 82,354 ​ ​ 49,691 ​ ​ 18,819 Total Packaging ​ $ 1,838,200 ​ $ 2,394,681 ​ $ 2,148,142 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ ​ ​ ​ ​ ​ ​ ​ ​ Factory Built ​ $ 718,773 ​ $ 1,181,837 ​ $ 1,098,905 Site Built ​ 977,129 ​ 1,361,607 ​ 1,190,393 Commercial ​ ​ 265,079 ​ ​ 336,298 ​ ​ 259,360 Concrete Forming ​ 200,078 ​ 264,126 ​ 149,776 Total Construction ​ $ 2,161,059 ​ $ 3,143,868 ​ $ 2,698,434 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ All Other ​ $ 328,884 ​ $ 431,611 ​ $ 362,473 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Corporate ​ $ 3,726 ​ $ 5,940 ​ $ 8,748 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total Net Sales ​ $ 7,218,384 ​ $ 9,626,739 ​ $ 8,636,134 (1) Effective January 1, 2023, the Packaging segment established new business units as follows: Structural Packaging, PalletOne, and Protective Packaging Solutions. This change resulted in the transfer of net sales from the these geographic business units to Structural Packaging, PalletOne and Protective Packaging in 2023. Product codes have been transferred within these three business units during 2023, and prior year figures have been updated to reflect the change for comparability purposes. The following table presents, for the periods indicated, our percentage of value-added and commodity-based sales to total net sales by segment. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 Value-Added ​ ​ ​ ​ ​ ​ ​ ​ ​ Retail ​ ​ 50.5% ​ ​ 44.9% ​ ​ 43.2% Packaging ​ ​ 77.0% ​ ​ 72.0% ​ ​ 67.7% Construction ​ ​ 83.2% ​ ​ 77.2% ​ ​ 73.0% All Other ​ ​ 83.8% ​ ​ 76.3% ​ ​ 74.7% Corporate ​ ​ 27.5% ​ ​ 44.3% ​ ​ 67.9% Total ​ ​ 68.4% ​ ​ 63.4% ​ ​ 59.7% ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commodity-Based ​ ​ ​ ​ ​ ​ ​ ​ ​ Retail ​ ​ 49.5% ​ ​ 55.1% ​ ​ 56.8% Packaging ​ ​ 23.0% ​ ​ 28.0% ​ ​ 32.3% Construction ​ ​ 16.8% ​ ​ 22.8% ​ ​ 27.0% All Other ​ ​ 16.2% ​ ​ 23.7% ​ ​ 25.3% Corporate ​ ​ 72.5% ​ ​ 55.7% ​ ​ 32.1% Total ​ ​ 31.6% ​ ​ 36.6% ​ ​ 40.3% ​

QUARTERLY FINANCIAL INFORMATION

QUARTERLY FINANCIAL INFORMATION (UNAUDITED)	12 Months Ended
	Dec. 30, 2023
QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
QUARTERLY FINANCIAL INFORMATION (UNAUDITED)	N. QUARTERLY FINANCIAL INFORMATION (UNAUDITED) The following table sets forth selected financial information for all of the quarters, consisting of 52 weeks during the year ended December 30, 2023 and 53 weeks during the year ended December 31, 2022, (in thousands, except per share data): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ First ​ Second ​ Third ​ Fourth ​ 2023 2022 2023 2022 2023 2022 2023 2022 Net sales ​ $ 1,822,476 ​ $ 2,489,313 ​ $ 2,043,918 ​ $ 2,900,874 ​ $ 1,827,637 ​ $ 2,322,855 ​ $ 1,524,353 ​ $ 1,913,697 Gross profit ​ 358,329 ​ 478,363 ​ 400,067 ​ 503,452 ​ 364,400 ​ 450,176 ​ 296,142 ​ 357,470 Net earnings ​ 125,578 ​ 193,131 ​ 150,788 ​ 207,853 ​ 134,183 ​ 172,101 ​ 103,908 ​ 131,879 Net earnings attributable to controlling interest ​ 126,069 ​ 189,703 ​ 150,761 ​ 203,118 ​ 134,035 ​ 167,241 ​ 103,447 ​ 132,589 Basic earnings per share ​ 2.01 ​ 3.01 ​ 2.40 ​ 3.24 ​ 2.14 ​ 2.68 ​ 1.65 ​ 2.12 Diluted earnings per share ​ 1.98 ​ 3.00 ​ 2.36 ​ 3.23 ​ 2.10 ​ 2.66 ​ 1.62 ​ 2.10 ​

SUMMARY OF SIGNIFICANT ACCOUN_2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 30, 2023
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
PRINCIPLES OF CONSOLIDATION	PRINCIPLES OF CONSOLIDATION The accompanying consolidated financial statements, have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and with the rules and regulations of the Securities and Exchange Commission (the "SEC"), represent our assets and liabilities and operating results. The consolidated financial statements include our accounts and those of our wholly-owned and majority-owned subsidiaries and partnerships. All significant intercompany balances and transactions have been eliminated in consolidation. We consolidate entities in which we have a controlling financial interest. In determining whether we have a controlling financial interest in a partially owned entity and the requirement to consolidate the accounts of that entity, we consider factors such as ownership interest, board representation, management representation, authority to make decisions, and contractual and substantive participating rights of the partners/members as well as whether the entity is a variable interest entity (“VIE”) and whether we are the primary beneficiary. The primary beneficiary of a VIE is the entity that has (i) the power to direct the activities that most significantly impact the entity's economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE. The primary beneficiary is required to consolidate the VIE. We account for unconsolidated VIEs using the equity method of accounting. As a result of the investment in Dempsey on June 27, 2022, we own 50% of the issued equity of that entity, and the remaining 50% of the issued equity is owned by the previous owners (“Sellers”). The investment in Dempsey is an unconsolidated variable interest entity and we have accounted for it using the equity method of accounting because we do not have a controlling financial interest in the entity. Per the contracts, the Sellers have a put right to sell their equity interest to us for $50 million and we have a call right to purchase the Seller’s equity interest for $70 million, which are both first exercisable in June 2025 and expire in June 2030. As of December 30, 2023, the carrying value of our investment in Dempsey is $61.4 million and is recorded in Other Assets. Our maximum exposure to loss consists of our investment amount and any contingent loss that may occur in the future as a result of a change in the fair value of Dempsey relative to the strike price of the put option.
NONCONTROLLING INTEREST IN SUBSIDIARIES	NONCONTROLLING INTEREST IN SUBSIDIARIES Noncontrolling interest in results of operations of consolidated subsidiaries represents the noncontrolling shareholders’ share of the income or loss of various consolidated subsidiaries. The noncontrolling interest reflects the original investment by these noncontrolling shareholders combined with their proportional share of the earnings or losses of these subsidiaries, net of distributions paid.
FISCAL YEAR	FISCAL YEAR Our fiscal year is a 52 or 53 week period, ending on the last Saturday of December. Unless otherwise stated, references to 2023, 2022, and 2021 relate to the fiscal years ended December 30, 2023, December 31, 2022, and December 25, 2021, respectively. Fiscal year 2023 was comprised of 52 weeks, fiscal year 2022 was comprised of 53 weeks and fiscal year 2021 was comprised of 52 weeks.
FAIR VALUE DISCLOSURES OF FINANCIAL INSTRUMENTS	FAIR VALUE DISCLOSURES OF FINANCIAL INSTRUMENTS We follow ASC Topic 820, Fair Value Measurements and Disclosures ● Level 1 — Financial instruments with unadjusted, quoted prices listed on active market exchanges. ● Level 2 — Financial instruments lacking unadjusted, quoted prices from active market exchanges, including over-the-counter traded financial instruments. Financial instrument values are determined using prices for recently traded financial instruments with similar underlying terms and direct or indirect observational inputs, such as interest rates and yield curves at commonly quoted intervals. ● Level 3 — Financial instruments not actively traded on a market exchange and there is little, if any, market activity. Values are determined using significant unobservable inputs or valuation techniques. Our investment portfolio includes restricted investments within our wholly-owned subsidiary, Ardellis Insurance Ltd. There are $24.8 million of restricted investments recorded as of December 30, 2023.
CASH AND CASH EQUIVALENTS	CASH AND CASH EQUIVALENTS Cash and cash equivalents consist of cash and highly liquid investments purchased with an original maturity of three months or less.
INVESTMENTS	INVESTMENTS Investments are deemed to be "available for sale" and are, accordingly, carried at fair value being the quoted market value.
ACCOUNTS RECEIVABLE AND ALLOWANCES	ACCOUNTS RECEIVABLE AND ALLOWANCES We perform periodic credit evaluations of our customers and generally do not require collateral. Accounts receivable are due under a range of terms we offer to our customers. Discounts are offered, in most instances, as an incentive for early payment. We base our allowances related to receivables on historical credit and collections experience, reasonable and supportable forecasts, and the specific identification of other potential problems, including the general economic climate. Actual collections can differ, requiring adjustments to the allowances. Individual accounts receivable balances are evaluated on a monthly basis, and those balances considered uncollectible are charged to the allowance. The following table presents the activity in our accounts receivable allowances (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Additions ​ ​ ​ ​ ​ ​ ​ ​ ​ Charged to ​ ​ ​ ​ ​ ​ ​ ​ Beginning ​ Costs and ​ ​ ​ Ending ​ ​ Balance ​ Expenses ​ Deductions* ​ Balance Year Ended December 30, 2023: ​ ​ ​ ​ Allowance for possible losses on accounts receivable ​ $ 11,727 ​ $ 56,522 ​ $ (63,116) ​ $ 5,133 Year Ended December 31, 2022: ​ ​ ​ ​ Allowance for possible losses on accounts receivable ​ $ 5,085 ​ $ 79,862 ​ $ (73,220) ​ $ 11,727 Year Ended December 25, 2021: ​ ​ ​ ​ Allowance for possible losses on accounts receivable ​ $ 4,629 ​ $ 66,883 ​ $ (66,427) ​ $ 5,085 * Includes accounts charged off, discounts given to customers and actual customer returns and allowances. We record estimated sales returns, discounts, and other applicable adjustments as a reduction of net sales in the same period revenue is recognized. Accounts receivable retainage amounts related to long term construction contracts totaled $8.2 million and $8.0 million as of December 30, 2023 and December 31, 2022, respectively. All amounts are expected to be collected within 18 months. Concentration of accounts receivable related to our two largest customers totaled $118.0 million and $131.0 million as of December 30, 2023 and December 31, 2022, respectively.
RECENTLY ISSUED ACCOUNTING GUIDANCE	RECENTLY ISSUED ACCOUNTING GUIDANCE In December 2023, the FASB issued ASU 2023-09, "Income Taxes (Topic 740): Improvements to Income Tax Disclosures," which is intended to enhance the transparency, decision usefulness and effectiveness of income tax disclosures. The amendments in this ASU require a public entity to disclose a tabular tax rate reconciliation, using both percentages and currency, with specific categories. A public entity is also required to provide a qualitative description of the states and local jurisdictions that make up the majority of the effect of the state and local income tax category and the net amount of income taxes paid, disaggregated by federal, state and foreign taxes and also disaggregated by individual jurisdictions. The amendments also remove certain disclosures that are no longer considered cost beneficial. The amendments are effective prospectively for annual periods beginning after December 15, 2024, and early adoption and retrospective application are permitted. Although the ASU only modifies our required income tax disclosures, we are currently evaluating the impact of adopting this guidance on the consolidated financial statements. In November 2023, the FASB issued ASU 2023-07, "Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures," which is intended to improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses, allowing financial statement users to better understand the components of a segment's profit or loss to assess potential future cash flows for each reportable segment and the entity as a whole. The amendments expand a public entity's segment disclosures by requiring disclosure of significant segment expenses that are regularly provided to the chief operating decision maker ("CODM"), clarifying when an entity may report one or more additional measures to assess segment performance, requiring enhanced interim disclosures, providing new disclosure requirements for entities with a single reportable segment, and requiring other new disclosures. The amendments are effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, and early adoption is permitted. Although the ASU only requires additional disclosures about the Company's operating segments, we are currently evaluating the impact of adopting this guidance on the consolidated financial statements. In October 2021, the FASB issued ASU 2021-08, Business Combinations (Topic 805), Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. The ASU requires that an acquirer recognize and measure contract assets and contract liabilities in a business combination in accordance with Topic 606. The ASU is effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years and has been applied prospectively to all business combinations occurring after this date.
INVENTORIES	INVENTORIES Inventories are stated at the lower of cost or net realizable value. The cost of inventories includes raw materials, direct labor, and manufacturing overhead and is determined using the weighted average cost method. Raw materials consist primarily of unfinished wood products and other materials expected to be manufactured or treated prior to sale, while finished goods represent various manufactured and treated wood products ready for sale. We have inventory on consignment at customer locations valued at $23.2 million as of December 30, 2023 and $27.9 million as of December 31, 2022. We write down the value of inventory, the impact of which is reflected in cost of goods sold in the Consolidated Statement of Earnings and Comprehensive Income, if the cost of specific inventory items on hand exceeds the amount we expect to realize from the ultimate sale or disposal of the inventory. These estimates are based on management's judgment regarding future demand and market conditions and analysis of historical experience.
PROPERTY, PLANT, AND EQUIPMENT	PROPERTY, PLANT, AND EQUIPMENT Property, plant, and equipment are stated at cost. Expenditures for renewals and betterments are capitalized, and maintenance and repairs are expensed as incurred. The components of property, plant and equipment as of December 30, 2023 and December 31, 2022 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended ​ December 30, December 31, ​ ​ 2023 ​ 2022 Land and improvements $ 185,188 ​ $ 171,729 Building and improvements ​ ​ 400,232 ​ ​ 355,228 Machinery and equipment ​ ​ 884,880 ​ ​ 708,095 Furniture and fixtures ​ 26,275 ​ ​ 23,186 Construction in progress ​ 62,729 ​ ​ 121,730 Total Property, Plant and Equipment, Gross ​ $ 1,559,304 ​ $ 1,379,968 ​ Amortization of assets held under finance leases is included in depreciation and amortized over the shorter of the estimated useful life of the asset or the lease term. Depreciation is computed principally by the straight-line method over the estimated useful lives of the assets as follows: ​ ​ ​ ​ Land improvements 5 to 15 years Buildings and improvements 10 to 32 years Machinery, equipment and office furniture 2 to 20 years ​ ​
LONG-LIVED ASSETS	LONG-LIVED ASSETS In accordance with ASC 360, Property, Plant, and Equipment
GOODWILL	GOODWILL Goodwill represents the excess of the purchase price over the fair value of net tangible and identifiable intangible assets of acquired businesses. Goodwill and intangible assets deemed to have indefinite lives are not amortized and are subject to impairment tests at least annually in accordance with ASC 350, Intangibles-Goodwill and Other. We review the carrying amounts of goodwill and other non-amortizable intangibles by reporting unit to determine if such assets may be impaired. As of the date of the most recent goodwill impairment test, which utilized data and assumptions as of September 30, 2023, it was determined that the fair values exceed the carrying values and there were no indicators for impairment for all of our reporting units. In the fourth quarter of 2022, we recorded a non-cash goodwill impairment charge of $2.5 million related to the Italian reporting unit within our all other segment. Subsequently, the Italian reporting unit was divested in 2023. We believe we have sufficient available information, both current and historical, to support our assumptions, judgments and estimates used in the goodwill impairment test. Our annual testing date for evaluating goodwill and indefinite-lived intangible asset impairment is the first day of our fourth fiscal quarter for all reporting units. Additionally, we review various triggering events throughout the year to determine whether a mid-year impairment analysis is required.
FOREIGN CURRENCY	FOREIGN CURRENCY Our foreign operations use the local currency as their functional currency. Accordingly, assets and liabilities are translated at exchange rates as of the balance sheet date and revenues and expenses are translated using weighted average rates, with translation adjustments included as a separate component of shareholders’ equity. Gains and losses arising from re-measuring foreign currency transactions are included in earnings.
INSURANCE RESERVES	INSURANCE RESERVES Our wholly-owned insurance company, Ardellis Insurance Ltd.(“Ardellis”), was incorporated on April 21, 2001 under the laws of Bermuda and is licensed as a Class 3A insurer under the Insurance Act 1978 of Bermuda. On April 14, 2017 the U.S. Branch of Ardellis Insurance Ltd. was granted its Certificate of Authority to transact property and casualty insurance lines as an admitted carrier in the State of Michigan. We are primarily self-insured for certain employee health benefits, and have self-funded retentions for general liability, automobile liability, property and workers’ compensation. We are fully self-insured for environmental liabilities. The general liability, automobile liability, property, workers’ compensation, and certain environmental liabilities are managed through Ardellis; the related assets and liabilities of which are included in the consolidated financial statements as of December 30, 2023 and December 31, 2022. Our policy is to accrue amounts equal to actuarially determined or internally computed liabilities. The actuarial and internal valuations are based on historical information along with certain assumptions about future events. Changes in assumptions for such matters as legal actions, medical cost trends, and changes in claims experience could cause these estimates to change in the future. In addition to providing coverage for the Company, Ardellis provides Excess Loss Insurance (primarily medical and prescription drug) and Excess General Liability and Property Insurance to certain third parties. As of December 30, 2023, Ardellis had 207 such contracts in place. Reserves associated with these contracts were $7.5 million at December 30, 2023, and $5.0 million at December 31, 2022, and are accrued based on third party actuarial valuations of the expected future liabilities.
INCOME TAXES	INCOME TAXES Deferred income tax assets and liabilities are computed for differences between the financial statement and tax basis of assets and liabilities that will result in taxable or deductible amounts in the future. Such deferred income tax asset and liability computations are based on enacted tax laws and rates. Valuation allowances are established when necessary to reduce deferred income tax assets to the amounts expected to be realized. Income tax expense is the tax payable or refundable for the period plus or minus the change during the period in deferred income tax assets and liabilities.
REVENUE RECOGNITION	REVENUE RECOGNITION Within the three primary segments (Retail, Packaging, and Construction) that the Company operates, there are a variety of written agreements governing the sale of our products and services. The transaction price is stated at the purchase order level, which includes shipping and/or freight costs and any applicable governmental authority taxes. The majority of our contracts have a single performance obligation concentrated around the delivery of goods to the carrier, Free On Board (FOB) shipping point. Therefore, revenue is recognized when this performance obligation is satisfied. Generally, title and control passes at the time of shipment. In certain circumstances, the customer takes title when the shipment arrives at the destination. However, our shipping process is typically completed the same day. Certain customer products that we provide require installation by the Company or a third party. Installation revenue is recognized upon completion. If we use a third party for installation, the party will act as an agent to us until completion of the installation. Installation revenue represents an immaterial share of our total net sales. We utilize rebates, credits, discounts and/or cash-based incentives with certain customers which are accounted for as variable consideration. We estimate these amounts based on the expected amount to be provided to customers and reduce revenues recognized. We believe that there will not be significant changes to our estimates of variable consideration. The allocation of these costs are applied at the invoice level and recognized in conjunction with revenue. Additionally, returns and refunds are estimated on a historical and expected basis which is a reduction of revenue recognized. Earnings on construction contracts are reflected in operations using over time accounting, under either cost to cost or units of delivery methods, depending on the nature of the business at individual operations, which is in accordance with ASC 606 as revenue is recognized when certain performance obligations are performed. Under over time accounting using the cost to cost method, revenues and related earnings on construction contracts are measured by the relationships of actual costs incurred relative to the total estimated costs. Under over time accounting using the units of delivery method, revenues and related earnings on construction contracts are measured by the relationships of actual units produced relative to the total number of units. Revisions in earnings estimates on the construction contracts are recorded in the accounting period in which the basis for such revisions becomes known. Projected losses on individual contracts are charged to operations in their entirety when such losses become apparent. Our construction contracts are generally entered into with a fixed price and completion of the projects can range from 6 The following table presents our net sales disaggregated by revenue source (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended ​ December 30, December 31, ​ December 25, 2023 vs. 2022 ​ 2022 vs. 2021 ​ ​ 2023 ​ 2022 ​ 2021 ​ % Change ​ % Change Point in Time Revenue ​ $ 7,069,690 ​ $ 9,442,794 ​ $ 8,512,012 (25.1)% ​ 10.9% Over Time Revenue ​ 148,694 ​ ​ 183,945 ​ ​ 124,122 (19.2)% ​ 48.2% Total Net Sales ​ $ 7,218,384 ​ $ 9,626,739 ​ $ 8,636,134 (25.0)% ​ 11.5% ​ The Construction segment comprises the construction contract revenue shown above. Construction contract revenue is primarily made up of site-built and framing customers. The following table presents the balances of over time accounting accounts on December 30, 2023 and December 31, 2022 which are included in “Other current assets” and “Accrued liabilities: Other”, respectively (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ December 30, ​ December 31, ​ 2023 2022 Cost and Earnings in Excess of Billings $ 3,572 $ 6,798 Billings in Excess of Cost and Earnings ​ 9,487 10,184 ​ SHIPPING AND HANDLING OF PRODUCT Shipping and handling costs that are charged to and reimbursed by the customer are recognized as revenue. Costs incurred related to the shipment and handling of products are classified in cost of goods sold.
SHARE-BASED COMPENSATION	SHARE-BASED COMPENSATION We account for share-based awards in accordance with ASC Topic 718, Compensation – Stock Compensation
EARNINGS PER SHARE	EARNINGS PER SHARE Earnings per share (“EPS”) is computed using the two-class method. The two-class method determines EPS for each class of common stock and participating securities according to dividends and their respective participation rights in undistributed earnings. Participating securities include non-vested shares of restricted stock in which the participants have non-forfeitable rights to dividends during the performance period. EPS, basic and diluted, is calculated by dividing net earnings attributable to controlling interest, net of applicable taxes, by the weighted average number of shares of common stock outstanding for the period. The computation of EPS is as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 30, December 31, December 25, ​ ​ 2023 ​ 2022 ​ 2021 Numerator: ​ ​ ​ Net earnings attributable to controlling interest ​ $ 514,312 ​ $ 692,651 ​ $ 535,640 Adjustment for earnings allocated to non-vested restricted common stock equivalents ​ (25,139) ​ (27,488) ​ (17,342) Net earnings for calculating EPS ​ $ 489,173 ​ $ 665,163 ​ $ 518,298 Denominator: ​ ​ ​ Weighted average shares outstanding ​ 62,683 ​ 62,667 ​ 62,209 Adjustment for non-vested restricted common stock equivalents ​ (3,064) ​ (2,487) ​ (2,014) Shares for calculating basic EPS ​ 59,619 ​ 60,180 ​ 60,195 Effect of dilutive restricted common stock equivalents ​ 1,020 ​ 473 ​ 159 Shares for calculating diluted EPS ​ 60,639 ​ 60,653 ​ 60,354 Net earnings per share: ​ ​ ​ Basic ​ $ 8.21 ​ $ 11.05 ​ $ 8.61 Diluted ​ $ 8.07 ​ $ 10.97 ​ $ 8.59 ​
USE OF ACCOUNTING ESTIMATES	USE OF ACCOUNTING ESTIMATES The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements as well as the reported amounts of revenues and expenses during the reporting period. We believe our estimates to be reasonable; however, actual results could differ from these estimates.
SEGMENT REPORTING	ASC 280, Segment Reporting (“ASC 280”), defines operating segments as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker in deciding how to allocate resources and in assessing performance. We operate manufacturing, treating and distribution facilities internationally, but primarily in the United States. Our business segments consist of UFP Retail Solutions, UFP Packaging and UFP Construction and align with the end markets we serve. This segment structure allows for a specialized and consistent sales approach among Company operations, efficient use of resources and capital, and quicker introduction of new products and services. We manage the operations of our individual locations primarily through a market-centered reporting structure under which each location is included in a business unit and business units are included in our Retail, Packaging, and Construction segments. In the case of locations which serve multiple segments, results are allocated and accounted for by segment. Two customers, The Home Depot and Lowes, accounted for approximately 17% and 12%, respectively, of our total net sales in fiscal 2023, 15% and 11%, respectively, of our total net sales in fiscal 2022 and 16% and 10%, respectively, in 2021. The exception to this market-centered reporting and management structure is our International segment, which comprises our Mexico, Canada, Europe, Asia, and Australia operations and sales and buying offices in other parts of the world and our Ardellis segment, which represents our wholly owned fully licensed captive insurance company based in Bermuda. Our International and Ardellis segments do not meet the quantitative thresholds in order to be separately reported and accordingly, the International and Ardellis segments have been aggregated in the “All Other” segment for reporting purposes.

SUMMARY OF SIGNIFICANT ACCOUN_3

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)	12 Months Ended
	Dec. 30, 2023
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Schedule of Accounts Receivable Allowances	The following table presents the activity in our accounts receivable allowances (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Additions ​ ​ ​ ​ ​ ​ ​ ​ ​ Charged to ​ ​ ​ ​ ​ ​ ​ ​ Beginning ​ Costs and ​ ​ ​ Ending ​ ​ Balance ​ Expenses ​ Deductions* ​ Balance Year Ended December 30, 2023: ​ ​ ​ ​ Allowance for possible losses on accounts receivable ​ $ 11,727 ​ $ 56,522 ​ $ (63,116) ​ $ 5,133 Year Ended December 31, 2022: ​ ​ ​ ​ Allowance for possible losses on accounts receivable ​ $ 5,085 ​ $ 79,862 ​ $ (73,220) ​ $ 11,727 Year Ended December 25, 2021: ​ ​ ​ ​ Allowance for possible losses on accounts receivable ​ $ 4,629 ​ $ 66,883 ​ $ (66,427) ​ $ 5,085 * Includes accounts charged off, discounts given to customers and actual customer returns and allowances.
Schedule of Components of Property, Plant and Equipment	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended ​ December 30, December 31, ​ ​ 2023 ​ 2022 Land and improvements $ 185,188 ​ $ 171,729 Building and improvements ​ ​ 400,232 ​ ​ 355,228 Machinery and equipment ​ ​ 884,880 ​ ​ 708,095 Furniture and fixtures ​ 26,275 ​ ​ 23,186 Construction in progress ​ 62,729 ​ ​ 121,730 Total Property, Plant and Equipment, Gross ​ $ 1,559,304 ​ $ 1,379,968
Schedule of Estimated Useful Lives of Property, Plant, and Equipment	​ ​ ​ ​ Land improvements 5 to 15 years Buildings and improvements 10 to 32 years Machinery, equipment and office furniture 2 to 20 years ​
Schedule of Disaggregation of revenue	The following table presents our net sales disaggregated by revenue source (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended ​ December 30, December 31, ​ December 25, 2023 vs. 2022 ​ 2022 vs. 2021 ​ ​ 2023 ​ 2022 ​ 2021 ​ % Change ​ % Change Point in Time Revenue ​ $ 7,069,690 ​ $ 9,442,794 ​ $ 8,512,012 (25.1)% ​ 10.9% Over Time Revenue ​ 148,694 ​ ​ 183,945 ​ ​ 124,122 (19.2)% ​ 48.2% Total Net Sales ​ $ 7,218,384 ​ $ 9,626,739 ​ $ 8,636,134 (25.0)% ​ 11.5%
Schedule of Percentage of Completion Account Balances	The following table presents the balances of over time accounting accounts on December 30, 2023 and December 31, 2022 which are included in “Other current assets” and “Accrued liabilities: Other”, respectively (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ December 30, ​ December 31, ​ 2023 2022 Cost and Earnings in Excess of Billings $ 3,572 $ 6,798 Billings in Excess of Cost and Earnings ​ 9,487 10,184
Schedule of Computation of earnings per share	The computation of EPS is as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 30, December 31, December 25, ​ ​ 2023 ​ 2022 ​ 2021 Numerator: ​ ​ ​ Net earnings attributable to controlling interest ​ $ 514,312 ​ $ 692,651 ​ $ 535,640 Adjustment for earnings allocated to non-vested restricted common stock equivalents ​ (25,139) ​ (27,488) ​ (17,342) Net earnings for calculating EPS ​ $ 489,173 ​ $ 665,163 ​ $ 518,298 Denominator: ​ ​ ​ Weighted average shares outstanding ​ 62,683 ​ 62,667 ​ 62,209 Adjustment for non-vested restricted common stock equivalents ​ (3,064) ​ (2,487) ​ (2,014) Shares for calculating basic EPS ​ 59,619 ​ 60,180 ​ 60,195 Effect of dilutive restricted common stock equivalents ​ 1,020 ​ 473 ​ 159 Shares for calculating diluted EPS ​ 60,639 ​ 60,653 ​ 60,354 Net earnings per share: ​ ​ ​ Basic ​ $ 8.21 ​ $ 11.05 ​ $ 8.61 Diluted ​ $ 8.07 ​ $ 10.97 ​ $ 8.59

FAIR VALUE (Tables)

FAIR VALUE (Tables)	12 Months Ended
	Dec. 30, 2023
FAIR VALUE
Assets measured at fair value	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 30, 2023 ​ December 31, 2022 ​ ​ Quoted ​ Prices with ​ ​ ​ ​ ​ ​ ​ Quoted ​ Prices with ​ ​ ​ ​ ​ ​ ​ ​ Prices in ​ Other ​ ​ Prices with ​ ​ ​ ​ Prices in ​ Other ​ ​ Prices with ​ ​ ​ ​ ​ Active ​ Observable ​ ​ Unobservable ​ ​ ​ ​ Active ​ Observable ​ ​ Unobservable ​ ​ ​ ​ ​ Markets ​ Inputs ​ ​ Inputs ​ ​ ​ ​ Markets ​ Inputs ​ ​ Inputs ​ ​ ​ ​ (Level 1) (Level 2) ​ (Level 3) ​ Total (Level 1) (Level 2) ​ (Level 3) Total Money market funds ​ $ 492,800 $ 6,133 ​ $ — $ 498,933 $ 390,219 $ 1,286 ​ $ — $ 391,505 Fixed income funds ​ 5,112 ​ 18,976 ​ ​ — 24,088 ​ 2,594 ​ 16,692 ​ ​ — 19,286 Treasury securities ​ ​ 344 ​ ​ — ​ ​ — ​ ​ 344 ​ ​ 343 ​ ​ — ​ ​ — ​ ​ 343 Equity securities ​ 16,411 ​ — ​ ​ 10,500 26,911 ​ 17,337 ​ — ​ ​ — 17,337 Alternative investments ​ ​ — ​ ​ — ​ ​ 4,052 ​ ​ 4,052 ​ ​ — ​ ​ — ​ ​ 4,102 ​ ​ 4,102 Mutual funds: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Domestic stock funds ​ 13,330 ​ — ​ ​ — 13,330 ​ 13,067 ​ — ​ ​ — 13,067 International stock funds ​ 509 ​ — ​ ​ — 509 ​ 1,414 ​ — ​ ​ — 1,414 Target funds ​ 9 ​ — ​ ​ — 9 ​ 8 ​ — ​ ​ — 8 Bond funds ​ 5 ​ — ​ ​ — 5 ​ 130 ​ — ​ ​ — 130 Alternative funds ​ ​ 474 ​ ​ — ​ ​ — ​ ​ 474 ​ ​ 474 ​ ​ — ​ ​ — ​ ​ 474 Total mutual funds ​ 14,327 ​ — ​ ​ — 14,327 ​ 15,093 ​ — ​ ​ — 15,093 Total ​ $ 528,994 ​ $ 25,109 ​ $ 14,552 ​ $ 568,655 ​ $ 425,586 ​ $ 17,978 ​ $ 4,102 ​ $ 447,666
Available for sale investment portfolio	Ardellis’ available for sale investment portfolio, including funds held with the State of Michigan, consists of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 30, 2023 ​ December 31, 2022 ​ ​ ​ ​ Unrealized ​ ​ ​ ​ ​ Unrealized ​ ​ ​ Cost Gain (Loss) Fair Value Cost Gain (Loss) Fair Value Fixed income ​ $ 25,514 $ (1,426) $ 24,088 ​ $ 21,399 $ (2,113) $ 19,286 Treasury securities ​ ​ 344 ​ ​ — ​ ​ 344 ​ ​ 343 ​ ​ — ​ ​ 343 Equity ​ 13,523 ​ ​ 2,888 16,411 ​ 15,762 ​ 1,575 17,337 Mutual funds ​ ​ 12,348 ​ ​ 1,934 ​ ​ 14,282 ​ ​ 13,430 ​ ​ 1,144 ​ ​ 14,574 Alternative investments ​ ​ 3,211 ​ ​ 841 ​ ​ 4,052 ​ ​ 3,105 ​ ​ 997 ​ ​ 4,102 Total ​ $ 54,940 ​ $ 4,237 $ 59,177 ​ $ 54,039 ​ $ 1,603 $ 55,642

BUSINESS COMBINATIONS AND EQU_2

BUSINESS COMBINATIONS AND EQUITY METHOD INVESTMENTS (Tables)	12 Months Ended
	Dec. 30, 2023
BUSINESS COMBINATIONS AND EQUITY METHOD INVESTMENTS
Business Acquisitions Accounted for Using Purchase Method	We completed the following business combinations in fiscal 2023 and 2022, which were accounted for using the purchase or equity method (in thousands). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net ​ Company Acquisition ​ Intangible Tangible Operating Name Date Purchase Price Assets Assets Segment ​ September 20, 2023 $52,841 $ 43,785 $ 9,056 International UFP Palets y Embalajes SL (UFP Palets) Headquartered in Castellón, Spain, UFP Palets (formerly known as Palets Suller Group) is the market leader in machine-built wood pallets, serving the region's large ceramic tile industry. The company had trailing 12-month sales of approximately $38 million through August 2023. ​ December 6, 2022 $70,942 $ 48,745 $ 22,197 Packaging Titan Corrugated, Inc. (Titan) and All Boxed Up, LLC (ABU) Located in Flower Mound, TX and founded in 2003, Titan’s primary products include boxes used in moving and storage, jumbo boxes for industrial products, corrugated shipping containers, and point-of-purchase displays. ABU distributes common box sizes manufactured by Titan throughout the United States. The combined companies had trailing 12-month sales through October 2022 of approximately $46.5 million. ​ June 27, 2022 $69,791 $ 34,552 $ 35,239 Packaging Dempsey Wood Products, Inc. (Dempsey) Located in Orangeburg, South Carolina and founded in 1988, Dempsey is a sawmill which produces products such as kiln dried finished lumber, industrial lumber, green cut stock lumber, pine chips and shavings, landscaping mulch, and sawdust. The Company had sales of approximately $69 million in 2021. ​ May 9, 2022 $15,398 $ 4,821 $ 10,577 Retail Cedar Poly, LLC Located in Tipton, Iowa, Cedar Poly is a full-service recycler of high-density and low-density polyethylene (HDPE and LDPE) flakes and pellets used in various products, including composite decking. The company also recycles corrugate and operates its own transportation fleet. Cedar Poly had 2021 sales of approximately $17.3 million and operates in UFP’s Deckorators business unit. ​ December 27, 2021 $24,057 $ 20,390 $ 5,667 Retail Ultra Aluminum Manufacturing, Inc. (Ultra) Located in Howell, Michigan and founded in 1996, Ultra is a leading manufacturer of aluminum fencing, gates and railing. The company designs and produces an extensive selection of ornamental aluminum fence and railing products for contractors, landscapers, fence dealers and wholesalers. The Company had sales of approximately $45 million in 2021. ​
Acquired Intangible Assets	The amounts assigned to major intangible classes for the business combinations mentioned above are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Non- ​ ​ ​ ​ ​ ​ ​ ​ Intangibles - ​ ​ Compete ​ ​ ​ ​ ​ Customer ​ ​ ​ ​ ​ ​ Tax ​ ​ Agreements ​ Technology ​ Patents ​ Relationships ​ Tradename ​ Goodwill ​ Deductible UFP Palets ​ $ — ​ $ — ​ $ — ​ $ 36,708 * $ — ​ $ 7,077 * $ 43,785 All Boxed Up ​ ​ — ​ ​ 393 ​ ​ — ​ ​ 864 ​ ​ 29 ​ ​ 628 ​ ​ 1,914 Titan ​ ​ — ​ ​ 9,607 ​ ​ — ​ ​ 21,136 ​ ​ 721 ​ ​ 15,367 ​ ​ 46,831 Cedar Poly ​ ​ 390 ​ ​ — ​ ​ — ​ ​ 2,490 ​ ​ 500 ​ ​ 1,441 ​ ​ 4,821 Ultra ​ ​ — ​ ​ — ​ ​ — ​ ​ 6,820 ​ ​ 5,020 ​ ​ 8,550 ​ ​ 20,390 ​ *(estimate)

GOODWILL AND OTHER INTANGIBLE_2

GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)	12 Months Ended
	Dec. 30, 2023
GOODWILL AND OTHER INTANGIBLE ASSETS
Schedule of Goodwill by Segment	The changes in the net carrying amount of goodwill by reporting segment for the years ended December 30, 2023 and December 31, 2022, are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Retail Packaging Construction All Other Corporate Total Balance as of December 25, 2021 $ 73,376 $ 128,541 $ 89,000 $ 24,121 ​ $ — $ 315,038 2022 Acquisitions ​ 10,971 ​ ​ 23,862 ​ ​ — ​ ​ — ​ ​ — ​ 34,833 2022 Purchase Accounting Adjustments ​ ​ 293 ​ ​ (3,494) ​ ​ (1,074) ​ ​ (4,766) ​ ​ — ​ ​ (9,041) 2022 Impairments ​ ​ — ​ ​ — ​ ​ — ​ ​ (2,480) ​ ​ — ​ ​ (2,480) Foreign Exchange, Net ​ — ​ ​ — ​ ​ (256) ​ ​ (774) ​ ​ — ​ (1,030) Balance as of December 31, 2022 $ 84,640 $ 148,909 $ 87,670 $ 16,101 ​ $ — $ 337,320 2023 Acquisitions ​ — ​ ​ — ​ ​ — ​ ​ 7,077 ​ ​ — ​ 7,077 2023 Purchase Accounting Adjustments ​ ​ (979) ​ ​ (7,867) ​ ​ — ​ ​ — ​ ​ — ​ ​ (8,846) Foreign Exchange, Net ​ — ​ ​ — ​ ​ 135 ​ ​ 627 ​ ​ — ​ 762 Balance as of December 30, 2023 ​ $ 83,661 $ 141,042 ​ $ 87,805 ​ $ 23,805 ​ $ — ​ $ 336,313
Other Intangible Assets	The following amounts were included in other amortizable intangible assets, net as of December 30, 2023 and December 31, 2022 (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ 2022 ​ ​ ​ Accumulated ​ ​ ​ ​ Accumulated ​ ​ ​ ​ Assets ​ Amortization ​ Net Value ​ Assets ​ Amortization ​ Net Value Non-compete agreements ​ $ 9,886 ​ $ (5,966) ​ $ 3,920 ​ $ 12,577 ​ $ (7,109) ​ $ 5,468 Customer relationships and other ​ 171,029 ​ (43,403) ​ ​ 127,626 ​ 139,112 ​ (34,646) ​ ​ 104,466 Licensing agreements ​ — ​ — ​ ​ — ​ 4,589 ​ (4,589) ​ ​ — Patents ​ 1,622 ​ (898) ​ ​ 724 ​ 1,976 ​ (1,104) ​ ​ 872 Technology ​ ​ 12,600 ​ ​ (2,173) ​ ​ 10,427 ​ ​ 2,600 ​ ​ (875) ​ ​ 1,725 Tradename ​ ​ 39,831 ​ ​ (12,320) ​ ​ 27,511 ​ ​ 38,826 ​ ​ (8,393) ​ ​ 30,433 Software ​ ​ 7,666 ​ ​ (2,679) ​ ​ 4,987 ​ ​ 1,788 ​ ​ (860) ​ ​ 928 Total ​ $ 242,634 ​ $ (67,439) ​ $ 175,195 ​ $ 201,468 ​ $ (57,576) ​ $ 143,892 ​
Estimated Useful Lives of Intangible Assets	​ ​ ​ ​ ​ ​ ​ ​ Weighted Average Intangible Asset Type ​ Estimated Useful Life ​ Amortization Period Non-compete agreements 2 to 15 years 7.5 years Customer relationships and other 5 to 15 years 10.4 years Licensing agreements 10 years 10 years Patents ​ 10 years ​ 10 years Technology ​ 5 to 12 years ​ 9.5 years Tradename (amortizable) 5 to 25 years 10.9 years Software ​ 3 to 5 years ​ 3 years
Expected Amortization Expense	Amortization expense of intangibles totaled $21.3 million, $19.5 million and $13.9 million in 2023, 2022 and 2021, respectively. The estimated amortization expense for intangibles for each of the five succeeding fiscal years is as follows (in thousands): ​ ​ ​ ​ 2024 $ 23,580 2025 ​ 22,998 2026 ​ 20,520 2027 ​ 18,636 2028 ​ 18,021 Thereafter ​ 71,440 Total ​ $ 175,195 ​

DEBT (Tables)

DEBT (Tables)	12 Months Ended
	Dec. 30, 2023
DEBT
Long-term Debt and Capital Lease Obligations	Long-term debt obligations are summarized as follows on December 30, 2023 and December 31, 2022 (amounts in thousands): ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 Series 2020 Senior Notes E, due on August 10, 2032, interest payable semi-annually at 3.04% ​ $ 50,000 ​ $ 50,000 Series 2020 Senior Notes F, due on August 10, 2033, interest payable semi-annually at 3.08% ​ ​ 50,000 ​ ​ 50,000 Series 2020 Senior Notes G, due on August 10, 2035, interest payable semi-annually at 3.15% ​ ​ 50,000 ​ ​ 50,000 Series 2018 Senior Notes C, due on June 14, 2028, interest payable semi-annually at 4.20% ​ ​ 40,000 ​ ​ 40,000 Series 2018 Senior Notes D, due on June 14, 2030, interest payable semi-annually at 4.27% ​ 35,000 ​ 35,000 Series 2012 Senior Notes Tranche B, due on December 17, 2024, interest payable semi-annually at 3.98% ​ 40,000 ​ 40,000 Foreign subsidiary borrowings under revolving credit facility, due on December 6, 2027, interest payable monthly at a floating rate (5.44% on December 30, 2023 and 4.13% on December 31, 2022) ​ ​ 3,692 ​ ​ 5,465 Series 1999 Industrial Development Revenue Bonds, due on August 1, 2029, interest payable monthly at a floating rate (3.33% on December 30, 2023 and 1.04% on December 31, 2022) ​ 3,300 ​ 3,300 Finance leases and foreign affiliate debt ​ 4,592 ​ 4,565 ​ ​ 276,584 ​ 278,330 Less current portion ​ (42,900) ​ (2,942) Less debt issuance costs ​ (150) ​ (234) Long-term portion ​ $ 233,534 ​ $ 275,154 ​
Principal Maturities of Long-term Debt and Capital Lease Obligations	On December 30, 2023, the principal maturities of long-term debt and finance lease obligations are as follows (in thousands): ​ ​ ​ ​ 2024 $ 42,823 2025 ​ 640 2026 ​ 186 2027 ​ 3,896 2028 ​ 40,223 Thereafter ​ 188,666 Total ​ $ 276,434 ​

LEASES (Tables)

LEASES (Tables)	12 Months Ended
	Dec. 30, 2023
LEASES
Schedule of lease costs	Lease costs under non-cancelable operating leases on December 30, 2023 and December 31, 2022 are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ ​ 2022 Operating lease cost ​ $ 33,829 ​ $ 32,458 Short-term lease cost ​ 9,525 ​ 10,490 Variable lease cost ​ 6,332 ​ 5,291 Sublease income ​ (2,267) ​ (2,876) Total lease cost ​ $ 47,419 ​ $ 45,363
Future Minimum Lease Payments	Future minimum payments under non-cancelable operating leases on December 30, 2023 are as follows (in thousands): ​ ​ ​ ​ ​ Operating ​ ​ Leases 2024 ​ $ 32,796 2025 ​ 29,435 2026 ​ 27,104 2027 ​ 17,998 2028 ​ 13,517 Thereafter ​ 31,686 Total minimum lease payments ​ $ 152,536 Less present value discount ​ ​ (44,674) Total lease liability ​ $ 107,862

COMMON STOCK (Tables)

COMMON STOCK (Tables)	12 Months Ended
	Dec. 30, 2023
COMMON STOCK
Schedule of common stock issuances	Below is a summary of common stock issuances for 2023 and 2022 (in thousands, except per share data): ​ ​ ​ ​ ​ ​ ​ December 30, 2023 Share Issuance Activity Common Stock ​ ​ Average Share Price Shares issued under the employee stock purchase plan ​ 33 ​ $ 98.20 ​ ​ ​ ​ ​ ​ Shares issued under the employee stock gift program ​ 2 ​ ​ 95.42 Shares issued under the director compensation plan ​ 3 ​ ​ 92.82 Shares issued under the LTSIP ​ 756 ​ ​ 86.14 Shares issued under the executive stock match plan ​ 75 ​ ​ 85.89 Forfeitures ​ (15) ​ ​ ​ Total shares issued under stock grant programs ​ 821 ​ $ 86.16 ​ ​ ​ ​ ​ ​ Shares issued under the deferred compensation plans ​ 124 ​ $ 88.43 ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 Share Issuance Activity Common Stock ​ ​ Average Share Price Shares issued under the employee stock purchase plan ​ 44 ​ $ 73.45 ​ ​ ​ ​ ​ ​ Shares issued under the employee stock gift program ​ 2 ​ ​ 78.23 Shares issued under the director retainer stock program ​ 4 ​ ​ 79.98 Shares issued under the LTSIP ​ 755 ​ ​ 82.73 Shares issued under the executive stock grants plan ​ 62 ​ ​ 82.87 Forfeitures ​ (17) ​ ​ ​ Total shares issued under stock grant programs ​ 806 ​ $ 82.71 ​ ​ ​ ​ ​ ​ Shares issued under the deferred compensation plans ​ 113 ​ $ 81.86
Nonvested Restricted Shares Activity	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted- ​ ​ ​ ​ ​ ​ ​ Unrecognized ​ Average ​ ​ ​ ​ Weighted- ​ Compensation ​ Period to ​ ​ Restricted ​ Average Grant ​ Expense ​ Recognize ​ ​ Awards ​ Date Fair Value ​ (in millions) ​ Expense Nonvested at December 26, 2020 1,363,794 $ 35.14 $ 6.3 0.62 years Granted 560,516 ​ 60.24 ​ Vested (274,271) ​ 26.50 ​ Forfeited (23,007) ​ 39.68 ​ Nonvested at December 25, 2021 1,627,032 $ 45.23 $ 6.6 0.43 years Granted 815,874 ​ 79.97 ​ Vested (286,661) ​ 34.00 ​ Forfeited (17,990) ​ 54.07 ​ Nonvested at December 31, 2022 2,138,255 ​ $ 58.70 ​ $ 51.4 3.74 years Granted 830,346 ​ 86.11 ​ Vested (233,763) ​ 40.50 ​ Forfeited (14,001) ​ 63.54 ​ Nonvested at December 30, 2023 2,720,837 ​ $ 68.61 ​ $ 76.9 3.68 years

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
	Dec. 30, 2023
INCOME TAXES
Components of Income Tax Expense (Benefit)	Income tax provisions for the years ended December 30, 2023, December 31, 2022, and December 25, 2021 are summarized as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ 2022 2021 Currently Payable: ​ ​ ​ Federal ​ $ 123,257 ​ $ 181,029 ​ $ 115,077 State and local ​ 28,580 ​ 44,646 ​ 30,441 Foreign ​ 10,808 ​ 17,336 ​ 21,095 ​ ​ 162,645 ​ 243,011 ​ 166,613 Net Deferred: ​ ​ ​ Federal ​ (2,249) ​ (8,561) ​ 6,242 State and local ​ (3,223) ​ (3,657) ​ 118 Foreign ​ (389) ​ (941) ​ 999 ​ ​ (5,861) ​ (13,159) ​ 7,359 Total income tax expense ​ $ 156,784 ​ $ 229,852 ​ $ 173,972
Components of Earnings Before Income Taxes	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 U.S. ​ $ 633,816 ​ $ 876,071 ​ $ 645,316 Foreign ​ 37,425 ​ 58,745 ​ 81,020 Total ​ $ 671,241 ​ $ 934,816 ​ $ 726,336
Effective Income Tax Rate Reconciliation	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 Statutory federal income tax rate 21.0 % 21.0 % 21.0 % State and local taxes (net of federal benefits) 3.6 3.4 3.3 ​ Tax credits, including foreign tax credit (0.9) (0.8) (0.6) ​ Change in uncertain tax positions reserve 0.2 (0.1) (0.1) ​ Other permanent differences 0.2 0.1 (0.4) ​ Other, net (0.7) 1.0 0.7 ​ Effective income tax rate 23.4 % 24.6 % 23.9 %
Components of Deferred Tax Assets and Liabilities	Temporary differences which give rise to deferred income tax assets and (liabilities) on December 30, 2023 and December 31, 2022 are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 Employee benefits ​ $ 45,661 ​ $ 37,893 Lease liability ​ ​ 27,918 ​ ​ 28,746 Net operating loss carryforwards ​ 7,881 ​ 6,891 Foreign subsidiary capital loss carryforward ​ 935 ​ 500 Other tax credits ​ 31 ​ 102 Inventory ​ 2,397 ​ 3,732 Reserves on receivables ​ 2,203 ​ 3,273 Accrued expenses ​ 3,373 ​ 6,791 Capitalized research and development costs ​ ​ 28,021 ​ ​ 11,080 Gross deferred income tax assets ​ 118,420 ​ 99,008 Valuation allowance ​ (6,014) ​ (4,618) Deferred income tax assets ​ 112,406 ​ 94,390 Depreciation ​ (82,617) ​ (69,711) Intangibles ​ (43,455) ​ (43,643) Right of use assets ​ ​ (26,870) ​ ​ (27,849) Other, net ​ (484) ​ (702) Deferred income tax liabilities ​ (153,426) ​ (141,905) Net deferred income tax liability ​ $ (41,020) ​ $ (47,515)
Schedule of NOL and credit carryforwards	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net Operating Losses ​ Tax Credits ​ U.S. State Foreign U.S. State 2024 - 2028 ​ $ — ​ $ 27 ​ $ 206 ​ $ — ​ $ — 2029 - 2033 ​ — ​ ​ 396 ​ ​ 1,268 ​ — ​ — 2034 - 2038 ​ — ​ ​ 1,618 ​ ​ 1,656 ​ — ​ 31 2039 - 2043 ​ 208 ​ ​ 1,373 ​ ​ — ​ — ​ — Thereafter ​ — ​ ​ — ​ ​ 570 ​ — ​ — Total ​ $ 208 ​ $ 3,414 ​ $ 3,700 ​ $ — ​ $ 31

ACCOUNTING FOR UNCERTAINTY IN_2

ACCOUNTING FOR UNCERTAINTY IN INCOME TAXES (Tables)	12 Months Ended
	Dec. 30, 2023
ACCOUNTING FOR UNCERTAINTY IN INCOME TAXES
Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 Gross unrecognized tax benefits beginning of year ​ $ 3,217 ​ $ 3,603 ​ $ 3,892 (Decrease) increase in tax positions for prior years ​ 943 ​ (216) ​ 437 Increase in tax positions for current year ​ 1,286 ​ 764 ​ 839 Lapse in statute of limitations ​ (675) ​ (934) ​ (1,565) Gross unrecognized tax benefits end of year ​ $ 4,771 ​ $ 3,217 ​ $ 3,603

SEGMENT REPORTING (Tables)

SEGMENT REPORTING (Tables)	12 Months Ended
	Dec. 30, 2023
SEGMENT REPORTING
Segment Reporting	The tables below are presented in thousands: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ All ​ ​ ​ ​ ​ ​ ​ Retail Packaging Construction Other Corporate Total Net sales to outside customers ​ $ 2,886,515 ​ $ 1,838,200 ​ $ 2,161,059 ​ $ 328,884 ​ $ 3,726 ​ $ 7,218,384 Intersegment net sales ​ 565,325 ​ 83,549 ​ 96,729 ​ 268,210 ​ (1,013,813) ​ — Interest expense (1) ​ 111 ​ 7 ​ — ​ (3,020) ​ 15,744 ​ 12,842 Amortization expense ​ 4,566 ​ ​ 8,849 ​ ​ 2,904 ​ ​ 3,488 ​ ​ 1,520 ​ 21,327 Depreciation expense ​ 23,943 ​ ​ 32,996 ​ ​ 19,546 ​ ​ 3,994 ​ ​ 30,084 ​ 110,563 Segment earnings before income taxes ​ 167,955 ​ 193,563 ​ 243,357 ​ 37,573 ​ 28,793 ​ 671,241 Segment assets ​ 781,005 ​ ​ 798,623 ​ ​ 621,762 ​ ​ 364,274 ​ ​ 1,452,133 ​ 4,017,797 Capital expenditures ​ 52,756 ​ ​ 52,694 ​ ​ 56,793 ​ ​ 1,432 ​ ​ 16,707 ​ 180,382 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ All ​ ​ ​ ​ ​ ​ ​ Retail Packaging Construction Other Corporate Total Net sales to outside customers ​ $ 3,650,639 ​ $ 2,394,681 ​ $ 3,143,868 ​ $ 431,611 ​ $ 5,940 ​ $ 9,626,739 Intersegment net sales ​ 392,740 ​ 78,409 ​ 110,523 ​ 421,406 ​ (1,003,078) ​ — Interest expense (1) ​ 177 ​ (2) ​ — ​ (1,310) ​ 15,045 ​ 13,910 Amortization expense ​ 4,131 ​ 6,925 ​ 3,358 ​ 4,571 ​ 514 ​ 19,499 Depreciation expense ​ 19,898 ​ 28,191 ​ 15,364 ​ 2,992 ​ 27,618 ​ 94,063 Segment earnings before income taxes ​ 150,165 ​ 333,087 ​ 397,446 ​ 56,813 ​ (2,695) ​ 934,816 Segment assets ​ 889,417 ​ ​ 885,878 ​ ​ 712,837 ​ ​ 308,688 ​ ​ 875,253 ​ 3,672,073 Capital expenditures ​ 55,806 ​ ​ 55,129 ​ ​ 54,167 ​ ​ 3,968 ​ ​ 5,054 ​ 174,124 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ All ​ ​ ​ ​ ​ ​ ​ Retail Packaging Construction Other Corporate Total Net sales to outside customers ​ $ 3,418,337 ​ $ 2,148,142 ​ $ 2,698,434 ​ $ 362,473 ​ $ 8,748 ​ $ 8,636,134 Intersegment net sales ​ 214,400 ​ 85,954 ​ 82,026 ​ 455,874 ​ (838,254) ​ — Interest expense (1) ​ 98 ​ 12 ​ 1 ​ 184 ​ 13,519 ​ 13,814 Amortization expense ​ 2,780 ​ 6,093 ​ 3,525 ​ 1,336 ​ 214 ​ 13,948 Depreciation expense ​ 16,955 ​ 26,219 ​ 13,151 ​ 2,094 ​ 25,765 ​ 84,184 Segment earnings before income taxes ​ 124,790 ​ 264,958 ​ 264,238 ​ 80,905 ​ (8,555) ​ 726,336 Segment assets ​ 844,189 ​ ​ 741,672 ​ ​ 736,157 ​ ​ 343,363 ​ ​ 579,890 ​ 3,245,271 Capital expenditures ​ 40,408 ​ ​ 42,652 ​ ​ 22,344 ​ ​ 5,140 ​ ​ 40,622 ​ 151,166 (1)
Information Regarding Principal Geographic Areas	Information regarding principal geographic areas was as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ 2022 ​ 2021 ​ ​ ​ ​ ​ Long-Lived ​ ​ ​ ​ Long-Lived ​ ​ ​ ​ Long-Lived ​ ​ ​ ​ ​ Tangible ​ ​ ​ ​ Tangible ​ ​ ​ ​ Tangible ​ Net Sales Assets Net Sales Assets Net Sales Assets United States ​ $ 6,935,431 ​ $ 779,748 ​ $ 9,254,676 ​ $ 770,921 ​ $ 8,395,737 ​ $ 679,757 Foreign ​ 282,953 ​ ​ 188,042 ​ ​ 372,063 ​ ​ 126,840 ​ ​ 240,397 ​ ​ 54,873 Total ​ $ 7,218,384 ​ $ 967,790 ​ $ 9,626,739 ​ $ 897,761 ​ $ 8,636,134 ​ $ 734,630
Percentage of Value-added and Commodity-based Sales to Total Sales	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 Value-Added ​ ​ ​ ​ ​ ​ ​ ​ ​ Retail ​ ​ 50.5% ​ ​ 44.9% ​ ​ 43.2% Packaging ​ ​ 77.0% ​ ​ 72.0% ​ ​ 67.7% Construction ​ ​ 83.2% ​ ​ 77.2% ​ ​ 73.0% All Other ​ ​ 83.8% ​ ​ 76.3% ​ ​ 74.7% Corporate ​ ​ 27.5% ​ ​ 44.3% ​ ​ 67.9% Total ​ ​ 68.4% ​ ​ 63.4% ​ ​ 59.7% ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commodity-Based ​ ​ ​ ​ ​ ​ ​ ​ ​ Retail ​ ​ 49.5% ​ ​ 55.1% ​ ​ 56.8% Packaging ​ ​ 23.0% ​ ​ 28.0% ​ ​ 32.3% Construction ​ ​ 16.8% ​ ​ 22.8% ​ ​ 27.0% All Other ​ ​ 16.2% ​ ​ 23.7% ​ ​ 25.3% Corporate ​ ​ 72.5% ​ ​ 55.7% ​ ​ 32.1% Total ​ ​ 31.6% ​ ​ 36.6% ​ ​ 40.3% ​
Gross Sales by Major Product Classification	The following table presents, for the periods indicated, our disaggregated net sales (in thousands) by business unit for each segment. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 Retail ​ ​ ​ ​ ​ ​ ​ ​ ​ Deckorators ​ $ 309,419 ​ $ 326,011 ​ $ 248,765 ProWood ​ 2,494,362 ​ 3,152,950 ​ 3,013,620 UFP Edge ​ 81,603 ​ 168,190 ​ 148,927 Other ​ 1,131 ​ 3,488 ​ 7,025 Total Retail ​ $ 2,886,515 ​ $ 3,650,639 ​ $ 3,418,337 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Packaging (1) ​ ​ ​ ​ ​ ​ ​ ​ ​ Structural Packaging ​ $ 1,225,204 ​ $ 1,716,021 ​ $ 1,554,857 PalletOne ​ ​ 530,642 ​ ​ 628,969 ​ ​ 574,466 Protective Packaging ​ ​ 82,354 ​ ​ 49,691 ​ ​ 18,819 Total Packaging ​ $ 1,838,200 ​ $ 2,394,681 ​ $ 2,148,142 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ ​ ​ ​ ​ ​ ​ ​ ​ Factory Built ​ $ 718,773 ​ $ 1,181,837 ​ $ 1,098,905 Site Built ​ 977,129 ​ 1,361,607 ​ 1,190,393 Commercial ​ ​ 265,079 ​ ​ 336,298 ​ ​ 259,360 Concrete Forming ​ 200,078 ​ 264,126 ​ 149,776 Total Construction ​ $ 2,161,059 ​ $ 3,143,868 ​ $ 2,698,434 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ All Other ​ $ 328,884 ​ $ 431,611 ​ $ 362,473 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Corporate ​ $ 3,726 ​ $ 5,940 ​ $ 8,748 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total Net Sales ​ $ 7,218,384 ​ $ 9,626,739 ​ $ 8,636,134 (1) Effective January 1, 2023, the Packaging segment established new business units as follows: Structural Packaging, PalletOne, and Protective Packaging Solutions. This change resulted in the transfer of net sales from the these geographic business units to Structural Packaging, PalletOne and Protective Packaging in 2023. Product codes have been transferred within these three business units during 2023, and prior year figures have been updated to reflect the change for comparability purposes.

QUARTERLY FINANCIAL INFORMATI_2

QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Tables)	12 Months Ended
	Dec. 30, 2023
QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
Quarterly Financial Information	The following table sets forth selected financial information for all of the quarters, consisting of 52 weeks during the year ended December 30, 2023 and 53 weeks during the year ended December 31, 2022, (in thousands, except per share data): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ First ​ Second ​ Third ​ Fourth ​ 2023 2022 2023 2022 2023 2022 2023 2022 Net sales ​ $ 1,822,476 ​ $ 2,489,313 ​ $ 2,043,918 ​ $ 2,900,874 ​ $ 1,827,637 ​ $ 2,322,855 ​ $ 1,524,353 ​ $ 1,913,697 Gross profit ​ 358,329 ​ 478,363 ​ 400,067 ​ 503,452 ​ 364,400 ​ 450,176 ​ 296,142 ​ 357,470 Net earnings ​ 125,578 ​ 193,131 ​ 150,788 ​ 207,853 ​ 134,183 ​ 172,101 ​ 103,908 ​ 131,879 Net earnings attributable to controlling interest ​ 126,069 ​ 189,703 ​ 150,761 ​ 203,118 ​ 134,035 ​ 167,241 ​ 103,447 ​ 132,589 Basic earnings per share ​ 2.01 ​ 3.01 ​ 2.40 ​ 3.24 ​ 2.14 ​ 2.68 ​ 1.65 ​ 2.12 Diluted earnings per share ​ 1.98 ​ 3.00 ​ 2.36 ​ 3.23 ​ 2.10 ​ 2.66 ​ 1.62 ​ 2.10 ​

SUMMARY OF SIGNIFICANT ACCOUN_4

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 30, 2023 USD ($) item contract customer	Dec. 31, 2022 USD ($)	Dec. 25, 2021
Summary of significant accounting policies
Number of markets | item		3
Length of fiscal year		364 days	371 days	364 days
Restricted investments		$ 24,800
Accounts receivable retainage	$ 8,000	$ 8,200	$ 8,000
Accounts receivable retainage, collection period		18 months
Inventory on consignment	27,900	$ 23,200	27,900
Number of insurance contracts with third party by Ardellis | contract		207
Reserve associated with contracts to third party by Ardellis	5,000	$ 7,500	5,000
Goodwill
Goodwill impairment			2,480
New accounting pronouncement
Retained earnings	2,217,410	2,582,332	2,217,410
Right-of-use assets	107,517	103,774	107,517
Operating lease liability		$ 107,862
Construction | Commercial
Goodwill
Goodwill impairment	2,500
Accounts receivables | Customer Concentration | Top two customers
Summary of significant accounting policies
Top two customers | customer		2
Concentration of accounts receivable related to largest customers	$ 131,000	$ 118,000	$ 131,000
Minimum
Summary of significant accounting policies
Length of fiscal year		364 days
Maximum
Summary of significant accounting policies
Length of fiscal year		371 days

SUMMARY OF SIGNIFICANT ACCOUN_5

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%
UFP Palets
Summary of significant accounting policies
Ownership interest		80%
Dempsey Wood Products, LLC
Summary of significant accounting policies
Call right			$ 70
Carrying value	$ 61.4
Sellers | Dempsey Wood Products, LLC
Summary of significant accounting policies
Ownership interest			50%
Sellers | UFP Palets
Summary of significant accounting policies
Ownership interest		20%
Sellers | Dempsey Wood Products, LLC
Summary of significant accounting policies
Sellers put right			$ 50

SUMMARY OF SIGNIFICANT ACCOUN_6

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Accounts Receivable Allowances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Allowance for Doubtful Accounts Receivable [Roll Forward]
Beginning Balance	$ 11,727	$ 5,085	$ 4,629
Additions Charged to Costs and Expenses	56,522	79,862	66,883
Deductions	(63,116)	(73,220)	(66,427)
Ending Balance	$ 5,133	$ 11,727	$ 5,085

SUMMARY OF SIGNIFICANT ACCOUN_7

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of components of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Dec. 30, 2023	Dec. 31, 2022
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Land and improvements	$ 185,188	$ 171,729
Building and improvements	400,232	355,228
Machinery and equipment	884,880	708,095
Furniture and fixtures	26,275	23,186
Construction in progress	62,729	121,730
Total Property, Plant and Equipment, Gross	$ 1,559,304	$ 1,379,968

SUMMARY OF SIGNIFICANT ACCOUN_8

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Estimated Useful Lives of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Dec. 30, 2023	Dec. 31, 2022
Property, Plant and Equipment
Property, plant and equipment	$ 1,559,304	$ 1,379,968
Accumulated amortization	$ 782,727	690,986
Land Improvements | Minimum
Property, Plant and Equipment
Property, plant and equipment, useful life	5 years
Land Improvements | Maximum
Property, Plant and Equipment
Property, plant and equipment, useful life	15 years
Building and Improvements | Minimum
Property, Plant and Equipment
Property, plant and equipment, useful life	10 years
Building and Improvements | Maximum
Property, Plant and Equipment
Property, plant and equipment, useful life	32 years
Machinery, Equipment and Office Furniture | Minimum
Property, Plant and Equipment
Property, plant and equipment, useful life	2 years
Machinery, Equipment and Office Furniture | Maximum
Property, Plant and Equipment
Property, plant and equipment, useful life	20 years
Software costs
Property, Plant and Equipment
Property, plant and equipment	$ 5,800	5,700
Accumulated amortization	$ 5,700	$ 5,400

SUMMARY OF SIGNIFICANT ACCOUN_9

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)	Jul. 01, 2023 USD ($)	Apr. 01, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 24, 2022 USD ($)	Jun. 25, 2022 USD ($)	Mar. 26, 2022 USD ($)	Dec. 30, 2023 USD ($) segment	Dec. 31, 2022 USD ($)	Dec. 25, 2021 USD ($)
Revenue Recognition.
Number of primary segments the Company operates | segment									3
Net sales	$ 1,524,353	$ 1,827,637	$ 2,043,918	$ 1,822,476	$ 1,913,697	$ 2,322,855	$ 2,900,874	$ 2,489,313	$ 7,218,384	$ 9,626,739	$ 8,636,134
Change % in net sales									(25.00%)	11.50%
Point in Time Revenue
Revenue Recognition.
Net sales									$ 7,069,690	$ 9,442,794	8,512,012
Change % in net sales									(25.10%)	10.90%
Over Time Revenue
Revenue Recognition.
Net sales									$ 148,694	$ 183,945	$ 124,122
Change % in net sales									(19.20%)	48.20%
Minimum
Revenue Recognition.
Number of months to complete contract projects	6 months								6 months
Maximum
Revenue Recognition.
Number of months to complete contract projects	18 months								18 months

SUMMARY OF SIGNIFICANT ACCOU_10

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Percentage of Completion Account Balances (Details) - USD ($) $ in Thousands	Dec. 30, 2023	Dec. 31, 2022
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Cost and Earnings in Excess of Billings	$ 3,572	$ 6,798
Billings in Excess of Cost and Earnings	$ 9,487	$ 10,184

SUMMARY OF SIGNIFICANT ACCOU_11

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Computation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2023	Sep. 30, 2023	Jul. 01, 2023	Apr. 01, 2023	Dec. 31, 2022	Sep. 24, 2022	Jun. 25, 2022	Mar. 26, 2022	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Numerator:
Net Income (Loss)	$ 103,447	$ 134,035	$ 150,761	$ 126,069	$ 132,589	$ 167,241	$ 203,118	$ 189,703	$ 514,312	$ 692,651	$ 535,640
Adjustment for earnings allocated to non-vested restricted common stock equivalents									(25,139)	(27,488)	(17,342)
Net earnings for calculating EPS									$ 489,173	$ 665,163	$ 518,298
Denominator:
Weighted average shares outstanding (in shares)									62,683	62,667	62,209
Adjustment for non-vested restricted common stock equivalents (in shares)									(3,064)	(2,487)	(2,014)
Shares for calculating basic EPS (in shares)									59,619	60,180	60,195
Effect of dilutive restricted common stock equivalents (in shares)									1,020	473	159
Shares for calculating diluted EPS (in shares)									60,639	60,653	60,354
Net earnings per share
Basic (USD per share)	$ 1.65	$ 2.14	$ 2.40	$ 2.01	$ 2.12	$ 2.68	$ 3.24	$ 3.01	$ 8.21	$ 11.05	$ 8.61
Diluted (USD per share)	$ 1.62	$ 2.10	$ 2.36	$ 1.98	$ 2.10	$ 2.66	$ 3.23	$ 3	$ 8.07	$ 10.97	$ 8.59

FAIR VALUE - Asset Measured at

FAIR VALUE - Asset Measured at Fair Value (Details) - USD ($) $ in Thousands	Dec. 30, 2023	Dec. 31, 2022
Fixed Income | Restricted Investment
Fair Value
Investments at fair value	$ 24,400	$ 19,600
Money market funds | Cash and Cash Equivalents
Fair Value
Investments at fair value	498,500	391,200
Money market funds | Restricted Investment
Fair Value
Investments at fair value	400	300
Equity | Other Non current Assets
Fair Value
Investments at fair value	10,500
Mutual funds, equity and alternative investments | Investments
Fair Value
Investments at fair value	34,800	36,100
Money market and mutual funds | Other Non current Assets
Fair Value
Investments at fair value	100	500
Ardellis Insurance Ltd.
Fair Value
Total Fair Value	59,177	55,642
Estimate of Fair Value Measurement | Recurring
Fair Value
Investments at fair value	568,655	447,666
Estimate of Fair Value Measurement | Recurring | Fixed Income
Fair Value
Investments at fair value	24,088	19,286
Estimate of Fair Value Measurement | Recurring | Money market funds
Fair Value
Investments at fair value	498,933	391,505
Estimate of Fair Value Measurement | Recurring | Treasury securities
Fair Value
Investments at fair value	344	343
Estimate of Fair Value Measurement | Recurring | Equity
Fair Value
Investments at fair value	26,911	17,337
Estimate of Fair Value Measurement | Recurring | Alternative Investments
Fair Value
Investments at fair value	4,052	4,102
Estimate of Fair Value Measurement | Recurring | Mutual Fund
Fair Value
Investments at fair value	14,327	15,093
Estimate of Fair Value Measurement | Recurring | Domestic stock
Fair Value
Investments at fair value	13,330	13,067
Estimate of Fair Value Measurement | Recurring | International stock funds
Fair Value
Investments at fair value	509	1,414
Estimate of Fair Value Measurement | Recurring | Target funds
Fair Value
Investments at fair value	9	8
Estimate of Fair Value Measurement | Recurring | Bond funds
Fair Value
Investments at fair value	5	130
Estimate of Fair Value Measurement | Recurring | Alternative funds
Fair Value
Investments at fair value	474	474
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1)
Fair Value
Investments at fair value	528,994	425,586
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Fixed Income
Fair Value
Investments at fair value	5,112	2,594
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Money market funds
Fair Value
Investments at fair value	492,800	390,219
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Treasury securities
Fair Value
Investments at fair value	344	343
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Equity
Fair Value
Investments at fair value	16,411	17,337
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Mutual Fund
Fair Value
Investments at fair value	14,327	15,093
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Domestic stock
Fair Value
Investments at fair value	13,330	13,067
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | International stock funds
Fair Value
Investments at fair value	509	1,414
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Target funds
Fair Value
Investments at fair value	9	8
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Bond funds
Fair Value
Investments at fair value	5	130
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Alternative funds
Fair Value
Investments at fair value	474	474
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2)
Fair Value
Investments at fair value	25,109	17,978
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Fixed Income
Fair Value
Investments at fair value	18,976	16,692
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Money market funds
Fair Value
Investments at fair value	6,133	1,286
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3)
Fair Value
Investments at fair value	14,552	4,102
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3) | Equity
Fair Value
Investments at fair value	10,500
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3) | Alternative Investments
Fair Value
Investments at fair value	$ 4,052	$ 4,102

FAIR VALUE - Available for Sale

FAIR VALUE - Available for Sale Investment Portfolio (Details) - Ardellis Insurance Ltd. - USD ($) $ in Thousands	Dec. 30, 2023	Dec. 31, 2022
Available-for-sale securities
Total Securities Cost	$ 54,940	$ 54,039
Unrealized Gain (Loss)	4,237	1,603
Total Fair Value	59,177	55,642
Fixed Income
Available-for-sale securities
Debt Securities Cost	25,514	21,399
Debt Securities Unrealized Gain/(Loss)	(1,426)	(2,113)
Debt Securities Fair Value	24,088	19,286
Treasury securities
Available-for-sale securities
Debt Securities Cost	344	343
Debt Securities Fair Value	344	343
Equity
Available-for-sale securities
Equity Securities Cost	13,523	15,762
Equity Securities Unrealized Gain/(Loss)	2,888	1,575
Equity Securities Fair Value	16,411	17,337
Mutual Fund
Available-for-sale securities
Debt Securities Cost	12,348	13,430
Debt Securities Unrealized Gain/(Loss)	1,934	1,144
Debt Securities Fair Value	14,282	14,574
Alternative Investments
Available-for-sale securities
Debt Securities Cost	3,211	3,105
Debt Securities Unrealized Gain/(Loss)	841	997
Debt Securities Fair Value	$ 4,052	$ 4,102

BUSINESS COMBINATIONS AND EQU_3

BUSINESS COMBINATIONS AND EQUITY METHOD INVESTMENTS (Details) - USD ($) $ in Thousands						12 Months Ended
	Sep. 20, 2023	Dec. 06, 2022	Jun. 27, 2022	May 09, 2022	Dec. 27, 2021	Dec. 30, 2023
Business Acquisition
Aggregate acquisitions' net sales						$ 95,000
Aggregate acquisitions' operating profit						$ 3,300
Dempsey Wood Products, LLC
Business Acquisition
Ownership interest			50%
Sellers | Dempsey Wood Products, LLC
Business Acquisition
Ownership interest			50%
Dempsey Wood Products, LLC | Packaging
Business Acquisition
Purchase consideration, equity method investment			$ 69,791
Intangible Assets			34,552
Net Tangible Assets			35,239
Acquired equity method investment, prior year sales			$ 69,000
UFP Palets | All Other | International Segment
Business Acquisition
Cash paid for business acquisition, net of cash acquired	$ 52,841
Percentage of stock purchase (as a percent)	80%
Intangible Assets	$ 43,785
Net Tangible Assets	9,056
Acquired entity, trailing 12-months sales	$ 38,000
Titan Corrugated, Inc. (Titan) and All Boxed Up, LLC | Packaging
Business Acquisition
Cash paid for business acquisition		$ 70,942
Percentage of assets purchased (as a percent)		100%
Intangible Assets		$ 48,745
Net Tangible Assets		22,197
Acquired entity, trailing 12-months sales		$ 46,500
Cedar Poly, LLC | Retail
Business Acquisition
Cash paid for business acquisition				$ 15,398
Percentage of assets purchased (as a percent)				100%
Intangible Assets				$ 4,821
Net Tangible Assets				10,577
Acquired entity, prior year sales				$ 17,300
Ultra | Retail
Business Acquisition
Cash paid for business acquisition, net of cash acquired					$ 24,057
Percentage of stock purchase (as a percent)					100%
Estimated contingent consideration					$ 2,000
Intangible Assets					20,390
Net Tangible Assets					5,667
Acquired entity, prior year sales					$ 45,000

BUSINESS COMBINATIONS AND EQU_4

BUSINESS COMBINATIONS AND EQUITY METHOD INVESTMENTS - Acquired Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Business Acquisition
GOODWILL	$ 336,313	$ 337,320	$ 315,038
All Boxed Up
Business Acquisition
GOODWILL	628
Intangible assets	1,914
UFP Palets
Business Acquisition
GOODWILL	7,077
Intangible assets	43,785
Titan
Business Acquisition
GOODWILL	15,367
Intangible assets	46,831
Cedar Poly, LLC
Business Acquisition
GOODWILL	1,441
Intangible assets	4,821
Ultra
Business Acquisition
GOODWILL	8,550
Intangible assets	20,390
Non-compete agreements | Cedar Poly, LLC
Business Acquisition
Intangible assets other than goodwill	390
Technology | All Boxed Up
Business Acquisition
Intangible assets other than goodwill	393
Technology | Titan
Business Acquisition
Intangible assets other than goodwill	9,607
Customer relationships | All Boxed Up
Business Acquisition
Intangible assets other than goodwill	864
Customer relationships | UFP Palets
Business Acquisition
Intangible assets other than goodwill	36,708
Customer relationships | Titan
Business Acquisition
Intangible assets other than goodwill	21,136
Customer relationships | Cedar Poly, LLC
Business Acquisition
Intangible assets other than goodwill	2,490
Customer relationships | Ultra
Business Acquisition
Intangible assets other than goodwill	6,820
Tradename | All Boxed Up
Business Acquisition
Intangible assets other than goodwill	29
Tradename | Titan
Business Acquisition
Intangible assets other than goodwill	721
Tradename | Cedar Poly, LLC
Business Acquisition
Intangible assets other than goodwill	500
Tradename | Ultra
Business Acquisition
Intangible assets other than goodwill	$ 5,020

GOODWILL AND OTHER INTANGIBLE_3

GOODWILL AND OTHER INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
GOODWILL AND OTHER INTANGIBLE ASSETS
Goodwill impairment		$ 2,480
Indefinite-lived intangible assets	$ 7,345	7,339
Amortization of intangibles	$ 21,327	$ 19,499	$ 13,948

GOODWILL AND OTHER INTANGIBLE_4

GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill by Reporting Segment (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2022	Dec. 30, 2023	Dec. 31, 2022
Goodwill
Goodwill, Beginning Balance		$ 337,320	$ 315,038
Acquisitions		7,077	34,833
Purchase Accounting Adjustments		(8,846)	(9,041)
Impairments			(2,480)
Foreign Exchange, Net		762	(1,030)
Goodwill, Ending Balance	$ 337,320	336,313	337,320
Retail
Goodwill
Goodwill, Beginning Balance		84,640	73,376
Acquisitions			10,971
Purchase Accounting Adjustments		(979)	293
Goodwill, Ending Balance	84,640	83,661	84,640
Packaging
Goodwill
Goodwill, Beginning Balance		148,909	128,541
Acquisitions			23,862
Purchase Accounting Adjustments		(7,867)	(3,494)
Goodwill, Ending Balance	148,909	141,042	148,909
Construction
Goodwill
Goodwill, Beginning Balance		87,670	89,000
Purchase Accounting Adjustments			(1,074)
Foreign Exchange, Net		135	(256)
Goodwill, Ending Balance	87,670	87,805	87,670
Construction | Commercial
Goodwill
Impairments	(2,500)
All Other
Goodwill
Goodwill, Beginning Balance		16,101	24,121
Acquisitions		7,077
Purchase Accounting Adjustments			(4,766)
Impairments			(2,480)
Foreign Exchange, Net		627	(774)
Goodwill, Ending Balance	$ 16,101	$ 23,805	$ 16,101

GOODWILL AND OTHER INTANGIBLE_5

GOODWILL AND OTHER INTANGIBLE ASSETS - Included in Other Amortizable Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 30, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets
Assets	$ 242,634	$ 201,468
Accumulated Amortization	(67,439)	(57,576)
Net Value	175,195	143,892
Non-compete agreements
Finite-Lived Intangible Assets
Assets	9,886	12,577
Accumulated Amortization	(5,966)	(7,109)
Net Value	3,920	5,468
Customer relationships
Finite-Lived Intangible Assets
Assets	171,029	139,112
Accumulated Amortization	(43,403)	(34,646)
Net Value	127,626	104,466
Licensing agreements
Finite-Lived Intangible Assets
Assets		4,589
Accumulated Amortization		(4,589)
Patents
Finite-Lived Intangible Assets
Assets	1,622	1,976
Accumulated Amortization	(898)	(1,104)
Net Value	724	872
Technology
Finite-Lived Intangible Assets
Assets	12,600	2,600
Accumulated Amortization	(2,173)	(875)
Net Value	10,427	1,725
Tradename
Finite-Lived Intangible Assets
Assets	39,831	38,826
Accumulated Amortization	(12,320)	(8,393)
Net Value	27,511	30,433
Software
Finite-Lived Intangible Assets
Assets	7,666	1,788
Accumulated Amortization	(2,679)	(860)
Net Value	$ 4,987	$ 928

GOODWILL AND OTHER INTANGIBLE_6

GOODWILL AND OTHER INTANGIBLE ASSETS - Estimated Useful Lives of Intangible Assets (Details)	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022
Non-compete agreements
Acquired Finite-Lived Intangible Assets
Weighted average amortization period	7 years 6 months
Customer relationships
Acquired Finite-Lived Intangible Assets
Weighted average amortization period	10 years 4 months 26 days
Licensing agreements
Acquired Finite-Lived Intangible Assets
Estimated useful life	10 years	10 years
Weighted average amortization period	10 years
Patents
Acquired Finite-Lived Intangible Assets
Estimated useful life	10 years	10 years
Weighted average amortization period	10 years
Technology
Acquired Finite-Lived Intangible Assets
Weighted average amortization period	9 years 6 months
Tradename
Acquired Finite-Lived Intangible Assets
Weighted average amortization period	10 years 10 months 24 days
Software
Acquired Finite-Lived Intangible Assets
Weighted average amortization period	3 years
Minimum | Non-compete agreements
Acquired Finite-Lived Intangible Assets
Estimated useful life	2 years	2 years
Minimum | Customer relationships
Acquired Finite-Lived Intangible Assets
Estimated useful life	5 years	5 years
Minimum | Technology
Acquired Finite-Lived Intangible Assets
Estimated useful life	5 years	5 years
Minimum | Tradename
Acquired Finite-Lived Intangible Assets
Estimated useful life	5 years	5 years
Minimum | Software
Acquired Finite-Lived Intangible Assets
Estimated useful life	3 years	3 years
Maximum | Non-compete agreements
Acquired Finite-Lived Intangible Assets
Estimated useful life	15 years	15 years
Maximum | Customer relationships
Acquired Finite-Lived Intangible Assets
Estimated useful life	15 years	15 years
Maximum | Technology
Acquired Finite-Lived Intangible Assets
Estimated useful life	12 years	12 years
Maximum | Tradename
Acquired Finite-Lived Intangible Assets
Estimated useful life	25 years	25 years
Maximum | Software
Acquired Finite-Lived Intangible Assets
Estimated useful life	5 years	5 years

GOODWILL AND OTHER INTANGIBLE_7

GOODWILL AND OTHER INTANGIBLE ASSETS - Estimated Amortization Expense for Intangibles (Details) - USD ($) $ in Thousands	Dec. 30, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity
2024	$ 23,580
2025	22,998
2026	20,520
2027	18,636
2028	18,021
Thereafter	71,440
Net Value	$ 175,195	$ 143,892

DEBT - Narrative (Details)

DEBT - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
	Dec. 06, 2022	Dec. 30, 2023	Dec. 31, 2022	Dec. 05, 2022	Feb. 28, 2021	Feb. 27, 2021	Aug. 10, 2020	Nov. 01, 2018
Debt
Outstanding letters of credit		$ 47.8	$ 59
Fair value of long-term debt including current portion		241.4
Difference between fair value and carrying value of debt		(35.1)
Revolving Credit Facility
Debt
Outstanding amount		3.7	5.5
Term of debt								5 years
Maximum borrowing capacity	$ 750			$ 550	$ 550	$ 375		$ 375
Outstanding letters of credit	60
Outstanding letters of credit that can be converted to foreign currency	$ 100
Remaining borrowing capacity		$ 709	$ 741.2
Revolving Credit Facility | Minimum
Debt
Facility fee (in hundredths)	0.15%
Revolving Credit Facility | Maximum
Debt
Facility fee (in hundredths)	0.30%
Series 2018 C Senior Notes | Senior Notes
Debt
Interest rate (in hundredths)		4.20%	4.20%
Series 2018 D Senior Notes | Senior Notes
Debt
Interest rate (in hundredths)		4.27%	4.27%
Series 2020 E Senior Notes | Senior Notes
Debt
Interest rate (in hundredths)		3.04%	3.04%				3.04%
Debt							$ 50
Series 2020 F Senior Notes | Senior Notes
Debt
Interest rate (in hundredths)		3.08%	3.08%				3.08%
Debt							$ 50
Series 2020 G Senior Notes | Senior Notes
Debt
Interest rate (in hundredths)		3.15%	3.15%				3.15%
Debt							$ 50
Series 2012 Senior Notes Tranche B | Senior Notes
Debt
Interest rate (in hundredths)		3.98%	3.98%
Letter of Credit
Debt
Term of debt		1 year
Outstanding letters of credit		$ 10.5	$ 10.5
Letter of Credit | Minimum
Debt
Interest rate (in hundredths)		1.125%
Letter of Credit | Maximum
Debt
Interest rate (in hundredths)		1.225%
Letter of Credit | Revolving Credit Facility
Debt
Outstanding letters of credit		$ 37.3	37.3
Letter of Credit | Industrial Development Revenue Bonds
Debt
Outstanding letters of credit		$ 3.3	$ 3.3

DEBT - Long-term Debt Obligatio

DEBT - Long-term Debt Obligations (Details) - USD ($) $ in Thousands	Dec. 30, 2023	Dec. 31, 2022	Dec. 06, 2022	Dec. 05, 2022	Feb. 28, 2021	Feb. 27, 2021	Aug. 10, 2020	Nov. 01, 2018
Debt
Total	$ 276,584	$ 278,330
Less current portion	(42,900)	(2,942)
Less debt issuance costs	(150)	(234)
Long-term portion	233,534	275,154
Finance Leases and Foreign Affiliate Debt
Debt
Total	4,592	4,565
Senior Notes | Series 2020 E Senior Notes
Debt
Total	$ 50,000	$ 50,000
Interest rate (in hundredths)	3.04%	3.04%					3.04%
Senior Notes | Series 2020 F Senior Notes
Debt
Total	$ 50,000	$ 50,000
Interest rate (in hundredths)	3.08%	3.08%					3.08%
Senior Notes | Series 2020 G Senior Notes
Debt
Total	$ 50,000	$ 50,000
Interest rate (in hundredths)	3.15%	3.15%					3.15%
Senior Notes | Series 2018 C Senior Notes
Debt
Total	$ 40,000	$ 40,000
Interest rate (in hundredths)	4.20%	4.20%
Senior Notes | Series 2018 D Senior Notes
Debt
Total	$ 35,000	$ 35,000
Interest rate (in hundredths)	4.27%	4.27%
Senior Notes | Series 2012 Senior Notes Tranche B
Debt
Total	$ 40,000	$ 40,000
Interest rate (in hundredths)	3.98%	3.98%
Revolving Credit Facility
Debt
Maximum borrowing capacity			$ 750,000	$ 550,000	$ 550,000	$ 375,000		$ 375,000
Revolving Credit Facility | Foreign Affiliate Debt
Debt
Total	$ 3,692	$ 5,465
Interest rate at period end (in hundredths)	5.44%	4.13%
Corporate Debt Securities | Series 1999 Industrial Development Revenue Bonds
Debt
Total	$ 3,300	$ 3,300
Interest rate at period end (in hundredths)	3.33%	1.04%

DEBT - Principal Maturities of

DEBT - Principal Maturities of Long-Term Debt and Capital Lease Obligations (Details) $ in Thousands	Dec. 30, 2023 USD ($)
Principal Maturities
2024	$ 42,823
2025	640
2026	186
2027	3,896
2028	40,223
Thereafter	188,666
Total	$ 276,434

LEASES (Details)

LEASES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Leases
Retained earnings	$ 2,582,332	$ 2,217,410
Right-of-use assets	103,774	107,517
Operating lease liability	$ 107,862
Lessee, Operating Lease, Existence of Option to Extend	true
Rent expense	$ 49,700	$ 48,200	$ 40,100
Operating lease weighted average remaining term	7 years 2 months 15 days	6 years 9 months 10 days
Operating lease weighted average discount rate	4.53%	3.70%
Lease costs
Operating lease cost	$ 33,829	$ 32,458
Short-term lease cost	9,525	10,490
Variable lease cost	6,332	5,291
Sublease Income	2,267	2,876
Total lease cost	47,419	45,363
Cash paid - operation leases	32,400	30,200
Right-of-use assets obtained in exchange for new operating leases	35,400	$ 32,000
Future minimum payments
2024	32,796
2025	29,435
2026	27,104
2027	17,998
2028	13,517
Thereafter	31,686
Total minimum lease payments	152,536
Less present value discount	(44,674)
Total lease liability	$ 107,862
Minimum
Leases
Length of lease (in years)	1 year
Renewal options of lease	5 years
Minimum | Motor vehicles
Leases
Length of lease (in years)	1 year
Minimum | Equipment
Leases
Length of lease (in years)	1 year
Minimum | Aircraft
Leases
Length of lease (in years)	1 year
Maximum
Leases
Length of lease (in years)	10 years
Renewal options of lease	15 years
Maximum | Motor vehicles
Leases
Length of lease (in years)	10 years
Maximum | Equipment
Leases
Length of lease (in years)	10 years
Maximum | Aircraft
Leases
Length of lease (in years)	10 years

DEFERRED COMPENSATION (Details)

DEFERRED COMPENSATION (Details) - USD ($) $ in Millions	Dec. 30, 2023	Dec. 31, 2022
Deferred compensation
Deferred compensation liability	$ 0	$ 0.1
Liabilities related to Plan	57.8	50.4
Other Assets
Deferred compensation
Investment in life insurance contracts	12.2	11.6
Assets held by the Plan	$ 0.1	$ 0.5

COMMON STOCK - Common Stock Iss

COMMON STOCK - Common Stock Issuances (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021	Jul. 26, 2023
Common Stock
Common stock issued, net of forfeitures	820,591	805,562	546,235
Repurchase of common stock (in shares)	974,869	1,246,616
Value of shares authorized to be repurchased				$ 200
Remaining authorized amount, repurchase of stock plan	$ 173
Average Share Price
Repurchase of common stock (dollars per share)	$ 84.27	$ 76.83
Stock Purchase Plan
Common Stock
Common stock issued	33,000	44,000
Average Share Price
Common stock issued (dollars per share)	$ 98.20	$ 73.45
Stock Gift Program
Common Stock
Common stock issued	2,000	2,000
Average Share Price
Common stock issued (dollars per share)	$ 95.42	$ 78.23
Director Compensation Plan
Common Stock
Common stock issued	3,000	4,000
Average Share Price
Common stock issued (dollars per share)	$ 92.82	$ 79.98
LTSIP
Common Stock
Common stock issued	756,000	755,000
Average Share Price
Common stock issued (dollars per share)	$ 86.14	$ 82.73
Executive Stock Grants Plan
Common Stock
Common stock issued	75,000	62,000
Average Share Price
Common stock issued (dollars per share)	$ 85.89	$ 82.87
Deferred Compensation Plans
Common Stock
Common stock issued	124,000	113,000
Average Share Price
Common stock issued (dollars per share)	$ 88.43	$ 81.86
Stock grant programs
Common Stock
Common stock issued, net of forfeitures	821,000	806,000
Forfeitures	(15,000)	(17,000)
Average Share Price
Common stock issued (dollars per share)	$ 86.16	$ 82.71

COMMON STOCK - Nonvested Restri

COMMON STOCK - Nonvested Restricted Shares Awards (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021	Dec. 26, 2020
Restricted Awards
Nonvested, beginning balance (in shares)	2,138,255	1,627,032	1,363,794
Granted (in shares)	830,346	815,874	560,516
Vested (in shares)	(233,763)	(286,661)	(274,271)
Forfeited (in shares)	(14,001)	(17,990)	(23,007)
Nonvested, ending balance (in shares)	2,720,837	2,138,255	1,627,032	1,363,794
Weighted Average Grant Date Fair Value
Nonvested, beginning balance (in dollars per share)	$ 58.70	$ 45.23	$ 35.14
Granted (in dollars per share)	86.11	79.97	60.24
Vested (in dollars per share)	40.50	34	26.50
Forfeited (in dollars per share)	63.54	54.07	39.68
Nonvested, ending balance (in dollars per share)	$ 68.61	$ 58.70	$ 45.23	$ 35.14
Unrecognized Compensation Expense
Nonvested restricted awards, unrecognized compensation expense	$ 76.9	$ 51.4	$ 6.6	$ 6.3
Nonvested restricted awards, weighted-average period to recognize expense	3 years 8 months 4 days	3 years 8 months 26 days	5 months 4 days	7 months 13 days

COMMON STOCK - Share-based Comp

COMMON STOCK - Share-based Compensation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021	Dec. 31, 2023	Dec. 31, 2021
Common stock
Granted (in shares)	830,346	815,874	560,516
Share-based compensation expense	$ 34.9	$ 28.2	$ 11.2
Income tax benefit from share-based compensation	8.2	6.9	2.7
Cash received from option exercises and share issuances under plans	$ 2.7	$ 2.8	2.1
Stock Repurchase Program [Abstract]
Repurchase of shares (in shares)	974,869	1,246,616
Stock Purchase Plan
Common stock
Discount rate from fair market value on purchase date (in hundredths)	85%
Director Compensation Plan
Common stock
Multiplier of retainer fee (in hundredths)	110%
Stock Retainer Plan expense	$ 1.9	$ 2	$ 1.7
Employee Stock Option [Member]
Common stock
Unrecognized compensation expense of stock options		0		$ 0	$ 0
Bonus Awards
Common stock
Share-based compensation expense	$ 5	13.8
Bonus Awards | Awards with three year vesting
Common stock
Vesting period (in years)	3 years
Bonus Awards | Awards with five year vesting
Common stock
Vesting period (in years)	5 years
Bonus Awards | Awards with eight year vesting
Common stock
Vesting period (in years)	8 years
Bonus Awards | LTSIP
Common stock
Amount of grants	$ 28.9
Granted (in shares)	254,746
Performance Shares
Common stock
Amount of grants	$ 1.2
Granted (in shares)	10,893
Vesting period (in years)	3 years
Sales Incentive Awards
Common stock
Amount of grants	$ 5.9
Granted (in shares)	51,802
Vesting period (in years)	5 years
Share-based compensation expense	$ 1	$ 0.9

RETIREMENT PLANS (Details)

RETIREMENT PLANS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 30, 2023	Dec. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 25, 2021
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution, percent (in hundredths)	25%		25%		25%
Defined contribution plan, cost recognized		$ 8.8		$ 11.7		$ 9.2
Additional matching contributions		$ 1.8		4.6		$ 3.7
Maximum annual contribution per employee (in hundredths)		6%
Number of years of service with the Company		20 years
Number of years of service with the Company as on officer		10 years
Other Liabilities
Defined Benefit Plan Disclosure [Line Items]
Liabilities related to Plan		$ 15.5	$ 14.8	$ 14.8

INCOME TAXES - Components of Ea

INCOME TAXES - Components of Earnings before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Components of earnings before income taxes [Abstract]
U.S.	$ 633,816	$ 876,071	$ 645,316
Foreign	37,425	58,745	81,020
Total.	$ 671,241	$ 934,816	$ 726,336

INCOME TAXES - Components of In

INCOME TAXES - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Currently Payable:
Federal	$ 123,257	$ 181,029	$ 115,077
State and local	28,580	44,646	30,441
Foreign	10,808	17,336	21,095
Total current payable	162,645	243,011	166,613
Net Deferred:
Federal	(2,249)	(8,561)	6,242
State and local	(3,223)	(3,657)	118
Foreign	(389)	(941)	999
Total net deferred	(5,861)	(13,159)	7,359
Income Tax Expense (Benefit), Total	$ 156,784	$ 229,852	$ 173,972

INCOME TAXES - Components of De

INCOME TAXES - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 30, 2023	Dec. 31, 2022
Deferred Tax Assets
Employee benefits	$ 45,661	$ 37,893
Lease liability	27,918	28,746
Net operating loss carryforwards	7,881	6,891
Foreign subsidiary capital loss carryforward	935	500
Other tax credits	31	102
Inventory	2,397	3,732
Reserves on receivables	2,203	3,273
Accrued expenses	3,373	6,791
Capitalized research and development costs	28,021	11,080
Gross deferred income tax assets	118,420	99,008
Valuation allowance	(6,014)	(4,618)
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent, Total	112,406	94,390
Deferred Tax Liabilities
Depreciation	(82,617)	(69,711)
Intangibles	(43,455)	(43,643)
Right of use assets	(26,870)	(27,849)
Other, net	(484)	(702)
Deferred income tax liabilities	(153,426)	(141,905)
Net deferred income tax liability	$ (41,020)	$ (47,515)

INCOME TAXES - Effective Income

INCOME TAXES - Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Effective income tax rate reconciliation
Statutory federal income tax rate	21%	21%	21%
State and local taxes (net of federal benefits)	3.60%	3.40%	3.30%
Tax credits, including foreign tax credit	(0.90%)	(0.80%)	(0.60%)
Change in uncertain tax positions reserve	0.20%	(0.10%)	(0.10%)
Other permanent differences	0.20%	0.10%	(0.40%)
Other, net	(0.70%)	1%	0.70%
Effective income tax rate	23.40%	24.60%	23.90%

INCOME TAXES - NOL and Credit C

INCOME TAXES - NOL and Credit Carryforwards (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Operating Loss and Credit Carryforwards
Valuation allowance - NOL carryforwards	$ 5,500
U.S. federal corporate tax rate	21%	21%	21%
Domestic Tax Authority
Operating Loss and Credit Carryforwards
Net Operating Losses	$ 208
Domestic Tax Authority | 2039 - 2043
Operating Loss and Credit Carryforwards
Net Operating Losses	208
State
Operating Loss and Credit Carryforwards
Net Operating Losses	3,414
Tax Credits	31
State | 2024 - 2028
Operating Loss and Credit Carryforwards
Net Operating Losses	27
State | 2029 - 2033
Operating Loss and Credit Carryforwards
Net Operating Losses	396
State | 2034 - 2038
Operating Loss and Credit Carryforwards
Net Operating Losses	1,618
Tax Credits	31
State | 2039 - 2043
Operating Loss and Credit Carryforwards
Net Operating Losses	1,373
Foreign Country
Operating Loss and Credit Carryforwards
Net Operating Losses	3,700
Foreign Country | 2024 - 2028
Operating Loss and Credit Carryforwards
Net Operating Losses	206
Foreign Country | 2029 - 2033
Operating Loss and Credit Carryforwards
Net Operating Losses	1,268
Foreign Country | 2034 - 2038
Operating Loss and Credit Carryforwards
Net Operating Losses	1,656
Foreign Country | Thereafter
Operating Loss and Credit Carryforwards
Net Operating Losses	570
Federal, state and foreign
Operating Loss and Credit Carryforwards
Net Operating Losses	7,900
Capital Loss Carryforward
Operating Loss and Credit Carryforwards
Valuation allowance - NOL carryforwards	100
Wholly-owned subsidiary | Capital Loss Carryforward
Operating Loss and Credit Carryforwards
Valuation allowance - NOL carryforwards	$ 500

ACCOUNTING FOR UNCERTAINTY IN_3

ACCOUNTING FOR UNCERTAINTY IN INCOME TAXES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Reconciliation of beginning and ending amount of unrecognized tax benefits [Roll Forward]
Gross unrecognized tax benefits beginning of year	$ 3,217	$ 3,603	$ 3,892
Increase in tax positions for prior years	943		437
Decrease in tax positions for prior years		(216)
Increase in tax positions for current year	1,286	764	839
Lapse in statute of limitations	(675)	(934)	(1,565)
Gross unrecognized tax benefits end of year	4,771	3,217	3,603
Income tax penalties and interest accrued	400	$ 300	$ 500
Increase in unrecognized tax benefits is reasonably possible	$ 1,200

COMMITMENTS, CONTINGENCIES, A_2

COMMITMENTS, CONTINGENCIES, AND GUARANTEES (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022
Long-term commitment
Outstanding purchase commitments on capital projects	$ 82.9
Surety Bonds and Letters of Credit
Outstanding letters of credit	47.8	$ 59
Open Projects
Surety Bonds and Letters of Credit
Payment and performance bonds outstanding	20.9
Completed Projects
Surety Bonds and Letters of Credit
Payment and performance bonds outstanding	6.9
Insurance Contracts
Surety Bonds and Letters of Credit
Outstanding letters of credit	44.5
Revenue Bonds
Surety Bonds and Letters of Credit
Outstanding letters of credit	$ 3.3

SEGMENT REPORTING - NARRATIVE (

SEGMENT REPORTING - NARRATIVE (Details) - Total Sales - Customer Concentration - customer	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021	Dec. 31, 2023
Two Customers
Concentration risk
Number of customers				2
Home Depot
Concentration risk
Percent of sales	17%	15%	16%
Lowes
Concentration risk
Percent of sales	12%	11%	10%

SEGMENT REPORTING - Information

SEGMENT REPORTING - Information By Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2023	Sep. 30, 2023	Jul. 01, 2023	Apr. 01, 2023	Dec. 31, 2022	Sep. 24, 2022	Jun. 25, 2022	Mar. 26, 2022	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Segment Reporting
Net sales	$ 1,524,353	$ 1,827,637	$ 2,043,918	$ 1,822,476	$ 1,913,697	$ 2,322,855	$ 2,900,874	$ 2,489,313	$ 7,218,384	$ 9,626,739	$ 8,636,134
Interest expense									12,842	13,910	13,814
Amortization expense									21,327	19,499	13,948
Depreciation									110,563	94,063	84,184
Segment earnings before income taxes									671,241	934,816	726,336
Segment assets	4,017,797				3,672,073				4,017,797	3,672,073	3,245,271
Capital expenditures									180,382	174,124	151,166
Intersegment net sales
Segment Reporting
Net sales									(1,013,813)	(1,003,078)	(838,254)
Corporate
Segment Reporting
Net sales									3,726	5,940	8,748
Interest expense									15,744	15,045	13,519
Amortization expense									1,520	514	214
Depreciation									30,084	27,618	25,765
Segment earnings before income taxes									28,793	(2,695)	(8,555)
Segment assets	1,452,133				875,253				1,452,133	875,253	579,890
Capital expenditures									16,707	5,054	40,622
Retail | Operating Segments
Segment Reporting
Net sales									2,886,515	3,650,639	3,418,337
Interest expense									111	177	98
Amortization expense									4,566	4,131	2,780
Depreciation									23,943	19,898	16,955
Segment earnings before income taxes									167,955	150,165	124,790
Segment assets	781,005				889,417				781,005	889,417	844,189
Capital expenditures									52,756	55,806	40,408
Retail | Intersegment net sales
Segment Reporting
Net sales									565,325	392,740	214,400
Packaging | Operating Segments
Segment Reporting
Net sales									1,838,200	2,394,681	2,148,142
Interest expense									7	(2)	12
Amortization expense									8,849	6,925	6,093
Depreciation									32,996	28,191	26,219
Segment earnings before income taxes									193,563	333,087	264,958
Segment assets	798,623				885,878				798,623	885,878	741,672
Capital expenditures									52,694	55,129	42,652
Packaging | Intersegment net sales
Segment Reporting
Net sales									83,549	78,409	85,954
Construction | Operating Segments
Segment Reporting
Net sales									2,161,059	3,143,868	2,698,434
Interest expense											1
Amortization expense									2,904	3,358	3,525
Depreciation									19,546	15,364	13,151
Segment earnings before income taxes									243,357	397,446	264,238
Segment assets	621,762				712,837				621,762	712,837	736,157
Capital expenditures									56,793	54,167	22,344
Construction | Intersegment net sales
Segment Reporting
Net sales									96,729	110,523	82,026
All Other | Operating Segments
Segment Reporting
Net sales									328,884	431,611	362,473
Interest expense									(3,020)	(1,310)	184
Amortization expense									3,488	4,571	1,336
Depreciation									3,994	2,992	2,094
Segment earnings before income taxes									37,573	56,813	80,905
Segment assets	$ 364,274				$ 308,688				364,274	308,688	343,363
Capital expenditures									1,432	3,968	5,140
All Other | Intersegment net sales
Segment Reporting
Net sales									$ 268,210	$ 421,406	$ 455,874

SEGMENT REPORTING - Informati_2

SEGMENT REPORTING - Information Regarding Principal Geographic Areas (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2023	Sep. 30, 2023	Jul. 01, 2023	Apr. 01, 2023	Dec. 31, 2022	Sep. 24, 2022	Jun. 25, 2022	Mar. 26, 2022	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Revenues and Long-Lived Assets
Net sales	$ 1,524,353	$ 1,827,637	$ 2,043,918	$ 1,822,476	$ 1,913,697	$ 2,322,855	$ 2,900,874	$ 2,489,313	$ 7,218,384	$ 9,626,739	$ 8,636,134
Long-Lived Tangible Assets	967,790				897,761				967,790	897,761	734,630
United States
Revenues and Long-Lived Assets
Net sales									6,935,431	9,254,676	8,395,737
Long-Lived Tangible Assets	779,748				770,921				779,748	770,921	679,757
Foreign
Revenues and Long-Lived Assets
Net sales									282,953	372,063	240,397
Long-Lived Tangible Assets	$ 188,042				$ 126,840				$ 188,042	$ 126,840	$ 54,873

SEGMENT REPORTING - Gross Sales

SEGMENT REPORTING - Gross Sales by Major Product Classification (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2023	Sep. 30, 2023	Jul. 01, 2023	Apr. 01, 2023	Dec. 31, 2022	Sep. 24, 2022	Jun. 25, 2022	Mar. 26, 2022	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Revenue
Net sales	$ 1,524,353	$ 1,827,637	$ 2,043,918	$ 1,822,476	$ 1,913,697	$ 2,322,855	$ 2,900,874	$ 2,489,313	$ 7,218,384	$ 9,626,739	$ 8,636,134
Value-Added
Revenue
Portion of total net sales (as a percent)	68.40%				63.40%				68.40%	63.40%	59.70%
Commodity-Based Sales
Revenue
Portion of total net sales (as a percent)	31.60%				36.60%				31.60%	36.60%	40.30%
Intersegment net sales
Revenue
Net sales									$ (1,013,813)	$ (1,003,078)	$ (838,254)
Corporate
Revenue
Net sales									$ 3,726	$ 5,940	$ 8,748
Corporate | Value-Added
Revenue
Portion of total net sales (as a percent)	27.50%				44.30%				27.50%	44.30%	67.90%
Corporate | Commodity-Based Sales
Revenue
Portion of total net sales (as a percent)	72.50%				55.70%				72.50%	55.70%	32.10%
Retail | Value-Added
Revenue
Portion of total net sales (as a percent)	50.50%				44.90%				50.50%	44.90%	43.20%
Retail | Commodity-Based Sales
Revenue
Portion of total net sales (as a percent)	49.50%				55.10%				49.50%	55.10%	56.80%
Retail | Operating Segments
Revenue
Net sales									$ 2,886,515	$ 3,650,639	$ 3,418,337
Retail | Operating Segments | Deckorators
Revenue
Net sales									309,419	326,011	248,765
Retail | Operating Segments | ProWood
Revenue
Net sales									2,494,362	3,152,950	3,013,620
Retail | Operating Segments | UFP Edge
Revenue
Net sales									81,603	168,190	148,927
Retail | Operating Segments | Other Retail
Revenue
Net sales									1,131	3,488	7,025
Retail | Intersegment net sales
Revenue
Net sales									$ 565,325	$ 392,740	$ 214,400
Packaging | Value-Added
Revenue
Portion of total net sales (as a percent)	77%				72%				77%	72%	67.70%
Packaging | Commodity-Based Sales
Revenue
Portion of total net sales (as a percent)	23%				28%				23%	28%	32.30%
Packaging | Operating Segments
Revenue
Net sales									$ 1,838,200	$ 2,394,681	$ 2,148,142
Packaging | Operating Segments | Structural Packaging
Revenue
Net sales									1,225,204	1,716,021	1,554,857
Packaging | Operating Segments | PalletOne
Revenue
Net sales									530,642	628,969	574,466
Packaging | Operating Segments | Protective Packaging
Revenue
Net sales									82,354	49,691	18,819
Packaging | Intersegment net sales
Revenue
Net sales									$ 83,549	$ 78,409	$ 85,954
Construction | Value-Added
Revenue
Portion of total net sales (as a percent)	83.20%				77.20%				83.20%	77.20%	73%
Construction | Commodity-Based Sales
Revenue
Portion of total net sales (as a percent)	16.80%				22.80%				16.80%	22.80%	27%
Construction | Operating Segments
Revenue
Net sales									$ 2,161,059	$ 3,143,868	$ 2,698,434
Construction | Operating Segments | Factory Built
Revenue
Net sales									718,773	1,181,837	1,098,905
Construction | Operating Segments | Site Built
Revenue
Net sales									977,129	1,361,607	1,190,393
Construction | Operating Segments | Commercial
Revenue
Net sales									265,079	336,298	259,360
Construction | Operating Segments | Concrete Forming
Revenue
Net sales									200,078	264,126	149,776
Construction | Intersegment net sales
Revenue
Net sales									$ 96,729	$ 110,523	$ 82,026
All Other | Value-Added
Revenue
Portion of total net sales (as a percent)	83.80%				76.30%				83.80%	76.30%	74.70%
All Other | Commodity-Based Sales
Revenue
Portion of total net sales (as a percent)	16.20%				23.70%				16.20%	23.70%	25.30%
All Other | Operating Segments
Revenue
Net sales									$ 328,884	$ 431,611	$ 362,473
All Other | Intersegment net sales
Revenue
Net sales									$ 268,210	$ 421,406	$ 455,874

QUARTERLY FINANCIAL INFORMATI_3

QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2023	Sep. 30, 2023	Jul. 01, 2023	Apr. 01, 2023	Dec. 31, 2022	Sep. 24, 2022	Jun. 25, 2022	Mar. 26, 2022	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
Length of fiscal year									364 days	371 days	364 days
NET SALES	$ 1,524,353	$ 1,827,637	$ 2,043,918	$ 1,822,476	$ 1,913,697	$ 2,322,855	$ 2,900,874	$ 2,489,313	$ 7,218,384	$ 9,626,739	$ 8,636,134
Gross profit	296,142	364,400	400,067	358,329	357,470	450,176	503,452	478,363	1,418,938	1,789,461	1,406,967
NET EARNINGS	103,908	134,183	150,788	125,578	131,879	172,101	207,853	193,131	514,457	704,964	552,364
Net earnings attributable to controlling interest	$ 103,447	$ 134,035	$ 150,761	$ 126,069	$ 132,589	$ 167,241	$ 203,118	$ 189,703	$ 514,312	$ 692,651	$ 535,640
EARNINGS PER SHARE - BASIC (USD per share)	$ 1.65	$ 2.14	$ 2.40	$ 2.01	$ 2.12	$ 2.68	$ 3.24	$ 3.01	$ 8.21	$ 11.05	$ 8.61
EARNINGS PER SHARE - DILUTED (USD per share)	$ 1.62	$ 2.10	$ 2.36	$ 1.98	$ 2.10	$ 2.66	$ 3.23	$ 3	$ 8.07	$ 10.97	$ 8.59

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2023	Sep. 30, 2023	Jul. 01, 2023	Apr. 01, 2023	Dec. 31, 2022	Sep. 24, 2022	Jun. 25, 2022	Mar. 26, 2022	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Pay vs Performance Disclosure
Net Income (Loss)	$ 103,447	$ 134,035	$ 150,761	$ 126,069	$ 132,589	$ 167,241	$ 203,118	$ 189,703	$ 514,312	$ 692,651	$ 535,640

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 30, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false