UFP Industries (UFPI) 10-K 23 Feb 22 2021 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 25, 2021	Jan. 30, 2022	Jun. 25, 2021
Document and Entity Information
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 25, 2021
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
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)		61,905,218
ICFR Auditor Attestation Flag	true
Auditor Name	Deloitte & Touche LLP
Auditor Firm ID	34
Auditor Location	Grand Rapids, Michigan
Current Fiscal Year End Date	--12-25
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Central Index Key	0000912767
Amendment Flag	false
Entity Public Float			$ 4,240,620,108
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 25, 2021	Dec. 26, 2020
CURRENT ASSETS:
Cash and cash equivalents	$ 286,662	$ 436,507
Restricted cash	4,561	101
Investments	36,495	24,308
Accounts receivable, net	737,805	470,504
Inventories:
Raw materials	416,043	316,481
Finished goods	547,277	250,813
Total inventories	963,320	567,294
Refundable income taxes	4,806	5,836
Other current assets	39,827	33,812
TOTAL CURRENT ASSETS	2,073,476	1,538,362
DEFERRED INCOME TAXES	3,462	2,413
RESTRICTED INVESTMENTS	19,310	17,565
RIGHT OF USE ASSETS	96,703	77,245
OTHER ASSETS	31,876	20,298
GOODWILL	315,038	252,193
INDEFINITE-LIVED INTANGIBLE ASSETS	7,369	7,401
OTHER INTANGIBLE ASSETS, NET	109,017	72,252
PROPERTY, PLANT AND EQUIPMENT:
Land and improvements	163,289	128,301
Building and improvements	329,698	272,864
Machinery and equipment	632,864	525,542
Furniture and fixtures	24,063	21,110
Construction in progress	62,199	26,680
PROPERTY, PLANT AND EQUIPMENT, GROSS	1,212,113	974,497
Less accumulated depreciation and amortization	(623,093)	(557,335)
PROPERTY, PLANT AND EQUIPMENT, NET	589,020	417,162
TOTAL ASSETS	3,245,271	2,404,891
CURRENT LIABILITIES:
Cash overdraft	17,030
Accounts payable	319,125	211,518
Accrued liabilities:
Compensation and benefits	289,196	166,478
Other	84,853	69,104
Current portion of lease liability	23,155	16,549
Current portion of long-term debt	42,683	100
TOTAL CURRENT LIABILITIES	776,042	463,749
LONG-TERM DEBT	277,567	311,607
LEASE LIABILITY	76,632	61,509
DEFERRED INCOME TAXES	60,964	25,266
OTHER LIABILITIES	37,497	59,608
TOTAL LIABILITIES	1,228,702	921,739
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 80,000,000; issued and outstanding, 61,901,851 and 61,205,780	61,902	61,206
Additional paid-in capital	243,995	218,224
Retained earnings	1,678,121	1,182,680
Accumulated other comprehensive loss	(5,405)	(1,794)
Total controlling interest shareholders' equity	1,978,613	1,460,316
Noncontrolling interest	37,956	22,836
TOTAL SHAREHOLDERS' EQUITY	2,016,569	1,483,152
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 3,245,271	$ 2,404,891

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 25, 2021	Dec. 26, 2020
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)	80,000,000	80,000,000
Common stock, shares issued (in shares)	61,901,851	61,205,780
Common stock, shares outstanding (in shares)	61,901,851	61,205,780

CONSOLIDATED STATEMENTS OF EARN

CONSOLIDATED STATEMENTS OF EARNINGS AND COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
NET SALES	$ 8,636,134	$ 5,153,998	$ 4,416,009
COST OF GOODS SOLD	7,229,167	4,353,702	3,730,491
GROSS PROFIT	1,406,967	800,296	685,518
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES	682,253	444,596	439,047
OTHER (GAINS) LOSSES, NET	(12,840)	9,874	1,565
EARNINGS FROM OPERATIONS	737,554	345,826	244,906
INTEREST EXPENSE	13,814	9,311	8,700
INTEREST AND INVESTMENT INCOME	(6,498)	(4,468)	(4,468)
EQUITY IN EARNINGS OF INVESTEE	3,902
NON-OPERATING (INCOME)/EXPENSE	11,218	4,843	4,232
EARNINGS BEFORE INCOME TAXES	726,336	340,983	240,674
INCOME TAXES	173,972	87,101	58,270
NET EARNINGS	552,364	253,882	182,404
LESS NET EARNINGS ATTRIBUTABLE TO NONCONTROLLING INTEREST	(16,724)	(7,104)	(2,754)
NET EARNINGS ATTRIBUTABLE TO CONTROLLING INTEREST	$ 535,640	$ 246,778	$ 179,650
EARNINGS PER SHARE - BASIC (USD per share)	$ 8.61	$ 4	$ 2.91
EARNINGS PER SHARE - DILUTED (USD per share)	$ 8.59	$ 4	$ 2.91
OTHER COMPREHENSIVE INCOME:
NET EARNINGS	$ 552,364	$ 253,882	$ 182,404
OTHER COMPREHENSIVE GAIN (LOSS)	(5,296)	5,967	1,513
COMPREHENSIVE INCOME	547,068	259,849	183,917
LESS COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST	(15,039)	(9,976)	(3,218)
COMPREHENSIVE INCOME ATTRIBUTABLE TO CONTROLLING INTEREST	$ 532,029	$ 249,873	$ 180,699

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. 29, 2018	$ 60,884	$ 178,540	$ 839,917	$ (5,938)	$ 15,281	$ 1,088,684
Increase (Decrease) in Stockholders' Equity
Net earnings			179,650		2,754	182,404
Foreign currency translation adjustment				568	464	1,032
Unrealized loss on investment & foreign currency				481		481
Distributions to noncontrolling interest					(2,143)	(2,143)
Acquisitions of noncontrolling interest		(4,737)			(2,338)	(7,075)
Cash dividends			(24,549)			(24,549)
Issuance of shares under employee stock purchase plan	34	1,059				1,093
Issuance of shares under stock grant programs	310	5,654	4			5,968
Issuance of shares under deferred compensation plans	181	(181)
Expense associated with share-based compensation arrangements		3,843				3,843
Accrued expense under deferred compensation plans		7,995				7,995
Ending balance at Dec. 28, 2019	61,409	192,173	995,022	(4,889)	14,018	1,257,733
Increase (Decrease) in Stockholders' Equity
Net earnings			246,778		7,104	253,882
Foreign currency translation adjustment				1,373	2,872	4,245
Unrealized gain on debt securities				1,722		1,722
Distributions to noncontrolling interest					(933)	(933)
Acquisitions of noncontrolling interest		130			(225)	(95)
Cash dividends			(30,669)			(30,669)
Issuance of shares under employee stock purchase plan	35	1,360				1,395
Issuance of shares under stock grant programs	390	12,140	5			12,535
Issuance of shares under deferred compensation plans	128	(128)
Repurchase of shares	(756)		(28,456)			(29,212)
Expense associated with share-based compensation arrangements		3,905				3,905
Accrued expense under deferred compensation plans		8,644				8,644
Ending 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			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)
Noncontrolling interest associated with business acquisitions					6,831	6,831
Distributions to noncontrolling interest					(6,750)	(6,750)
Cash dividends			(40,209)			(40,209)
Issuance of shares under employee stock purchase plan	33	2,083				2,116
Issuance 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

CONSOLIDATED STATEMENTS OF SH_2

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Increase (Decrease) in Stockholders' Equity
Cash dividends per share (USD per share)	$ 0.65	$ 0.50	$ 0.40
Net issuance of shares under employee stock plans (in shares)	33,104	35,133	33,647
Issuance of shares under deferred compensation plans (in shares)	116,732	127,735	181,565
Repurchase of shares (in shares)	0	756,397
No of shares under stock grant programs	546,235	390,720	309,628

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 552,364	$ 253,882	$ 182,404
Adjustments to reconcile net earnings to net cash from operating activities:
Depreciation	84,184	63,964	60,494
Amortization of intangibles	13,948	8,716	6,325
Expense associated with share-based and grant compensation arrangements	11,224	4,034	4,007
Deferred income taxes	5,653	1,857	7,176
Unrealized gain on investments and other	(4,118)	(2,076)	(2,523)
Equity in earnings of investee	3,902
Net gain on sale and disposition of assets	(11,992)	1,470	1,565
Goodwill impairment		11,485
Gain from reduction of estimated earnout liability		(4,134)
Changes in:
Accounts receivable	(85,439)	(87,552)	(16,872)
Inventories	(260,301)	(76,022)	73,120
Accounts payable and cash overdraft	78,060	62,405	(24,132)
Accrued liabilities and other	124,992	98,448	57,727
NET CASH PROVIDED BY OPERATING ACTIVITIES	512,477	336,477	349,291
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(151,166)	(89,182)	(84,933)
Proceeds from sale of property, plant and equipment	29,973	2,922	1,777
Acquisitions and purchases of non-controlling interest, net of cash received	(475,960)	(65,255)	(39,122)
Investment in life insurance contracts			(15,253)
Purchases of investments	(23,797)	(28,054)	(13,352)
Proceeds from sale of investments	14,882	24,805	9,828
Other	(5,119)	46	(982)
NET CASH USED IN INVESTING ACTIVITIES	(611,187)	(154,718)	(142,037)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings under revolving credit facilities	892,072	6,862	422,057
Repayments under revolving credit facilities	(888,695)	(6,498)	(460,537)
Contingent consideration payments and other	(3,176)	(5,787)	(3,136)
Issuance of long-term debt		150,000
Proceeds from issuance of common stock	2,116	1,395	1,093
Dividends paid to shareholders	(40,209)	(30,669)	(24,549)
Distributions to noncontrolling interest	(6,750)	(932)	(2,216)
Repurchase of common stock		(29,212)
Other	(364)	62	20
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES	(45,006)	85,221	(67,268)
Effect of exchange rate changes on cash	(1,669)	962	482
NET CHANGE IN CASH AND CASH EQUIVALENTS	(145,385)	267,942	140,468
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, BEGINNING OF YEAR	436,608	168,666	28,198
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, END OF PERIOD	$ 291,223	$ 436,608	$ 168,666

CONSOLIDATED STATEMENTS OF CA_2

CONSOLIDATED STATEMENTS OF CASH FLOWS - SUPPLEMENTAL (Parenthetical) - USD ($) $ in Thousands	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH:
Cash and cash equivalents, beginning of period	$ 436,507	$ 168,336	$ 27,316
Restricted cash, beginning of period	101	330	882
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, BEGINNING OF YEAR	436,608	168,666	28,198
Cash and cash equivalents, end of period	286,662	436,507	168,336
Restricted cash, end of period	4,561	101	330
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, END OF PERIOD	$ 291,223	$ 436,608	$ 168,666

CONSOLIDATED STATEMENTS OF CA_3

CONSOLIDATED STATEMENTS OF CASH FLOWS - SUPPLEMENTAL AND NON-CASH FINANCING ACTIVITIES (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
SUPPLEMENTAL INFORMATION:
Interest paid	$ 14,077	$ 7,204	$ 8,763
Income taxes paid	167,043	77,964	50,224
NON-CASH INVESTING ACTIVITIES
Capital expenditures included in accounts payable	3,256
NON-CASH FINANCING ACTIVITIES:
Common stock issued under deferred compensation plans	$ 7,487	$ 6,870	$ 6,229

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 25, 2021
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	A. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES OPERATIONS We are a holding company whose subsidiaries supply wood, wood composite and other products to three markets: retail, construction and industrial. Founded in 1955, we are headquartered in Grand Rapids, Michigan, with affiliates throughout North America, Europe, Asia and Australia. PRINCIPLES OF CONSOLIDATION The consolidated financial statements include our accounts and those of our wholly-owned and majority-owned subsidiaries and partnerships. In addition, we consolidate any entity which we own 50% or more and exercise control. Intercompany transactions and balances have been eliminated. 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 2021, 2020, and 2019 relate to the fiscal years ended December 25, 2021, December 26, 2020, and December 28, 2019, respectively. Fiscal years 2021, 2020, and 2019 were 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 $19.3 million of restricted investments recorded as of December 25, 2021. 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 25, 2021: ​ ​ ​ ​ Allowance for possible losses on accounts receivable ​ $ 4,629 ​ $ 66,883 ​ $ (66,427) ​ $ 5,085 Year Ended December 26, 2020: ​ ​ ​ ​ Allowance for possible losses on accounts receivable ​ $ 4,440 ​ $ 48,954 ​ $ (48,765) ​ $ 4,629 Year Ended December 28, 2019: ​ ​ ​ ​ Allowance for possible losses on accounts receivable ​ $ 2,601 ​ $ 39,481 ​ $ (37,642) ​ $ 4,440 * 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 $7.8 million and $8.7 million as of December 25, 2021 and December 26, 2020, respectively. All amounts are expected to be collected within 18 months. Concentration of accounts receivable related to our two largest customers totaled $87.6 million and $97.9 million as of December 25, 2021 and December 26, 2020, respectively. In June 2016, the FASB issued ASU 2016-13, Financial Instrument-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (ASU 2016-13), which changes the current incurred loss model to a forward looking expected credit loss model for most financial assets, such as trade and other receivables, loans and other instruments. The ASU is effective for fiscal years beginning after December 15, 2019. Entities are required to apply the provisions of the standard through a cumulative-effect adjustment to retained earnings as of effective date. We have adopted the new standard as of the beginning of fiscal year 2020 and have concluded the standard does not have a material impact on our consolidated financial statements and disclosures, accounting processes, and internal controls. INVENTORIES Inventories are stated at the lower of cost or market. The cost of inventories includes raw materials, direct labor, and manufacturing overhead. Cost is determined on a weighted average basis. 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 $37.8 million as of December 25, 2021 and $20.8 million as of December 26, 2020. 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. 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 25, 2021, all other reporting units had a fair value that was substantially in excess of the carrying value. In the fourth quarter of 2020, we recorded a non-cash goodwill impairment charge of $11.5 million related to the commercial reporting unit within our construction segment. 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 25, 2021 and December 26, 2020. 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) to certain third parties. As of December 25, 2021, Ardellis had 43 such contracts in place. Reserves associated with these contracts were $7.1 million at December 25, 2021, and $4.5 million at December 26, 2020, 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, Industrial, 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 related 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 related 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 25, December 26, ​ December 28, 2021 vs. 2020 ​ 2020 vs. 2019 ​ ​ 2021 ​ 2020 ​ 2019 ​ % Change ​ % Change FOB Shipping Point Revenue ​ $ 8,512,012 ​ $ 5,025,895 ​ $ 4,272,583 69.4% ​ 17.6% Construction Contract Revenue ​ 124,122 ​ ​ 128,103 ​ ​ 143,426 (3.1)% ​ (10.7)% Total Net Sales ​ $ 8,636,134 ​ $ 5,153,998 ​ $ 4,416,009 67.6% ​ 16.7% ​ 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 25, 2021 and December 26, 2020 which are included in “Other current assets” and “Accrued liabilities: Other”, respectively (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ December 25, ​ December 26, ​ 2021 2020 Cost and Earnings in Excess of Billings $ 5,602 $ 4,169 Billings in Excess of Cost and Earnings ​ 10,744 11,530 ​ 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 25, December 26, December 28, ​ ​ 2021 ​ 2020 ​ 2019 Numerator: ​ ​ ​ Net earnings attributable to controlling interest ​ $ 535,640 ​ $ 246,778 ​ $ 179,650 Adjustment for earnings allocated to non-vested restricted common stock ​ (17,342) ​ (6,903) ​ (4,496) Net earnings for calculating EPS ​ $ 518,298 ​ $ 239,875 ​ $ 175,154 Denominator: ​ ​ ​ Weighted average shares outstanding ​ 62,209 ​ 61,632 ​ 61,649 Adjustment for non-vested restricted common stock ​ (2,014) ​ (1,724) ​ (1,543) Shares for calculating basic EPS ​ 60,195 ​ 59,908 ​ 60,106 Effect of dilutive restricted common stock ​ 159 ​ 20 ​ 24 Shares for calculating diluted EPS ​ 60,354 ​ 59,928 ​ 60,130 Net earnings per share: ​ ​ ​ Basic ​ $ 8.61 ​ $ 4.00 ​ $ 2.91 Diluted ​ $ 8.59 ​ $ 4.00 ​ $ 2.91 ​ 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. 25, 2021
FAIR VALUE	B. FAIR VALUE We apply the provisions of ASC 820, Fair Value Measurements and Disclosures, ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 25, 2021 ​ December 26, 2020 ​ ​ 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 ​ $ 19 $ 9,392 ​ $ — $ 9,411 $ 19 $ 4,643 ​ $ — $ 4,662 Fixed income funds ​ 1,668 ​ 16,910 ​ ​ — 18,578 ​ 246 ​ 16,224 ​ ​ — 16,470 Treasury securities ​ ​ 342 ​ ​ — ​ ​ — ​ ​ 342 ​ ​ — ​ ​ — ​ ​ — ​ ​ — Equity securities ​ 20,163 ​ — ​ ​ — 20,163 ​ 12,602 ​ — ​ ​ — 12,602 Alternative investments ​ ​ — ​ ​ — ​ ​ 3,785 ​ ​ 3,785 ​ ​ — ​ ​ — ​ ​ 2,040 ​ ​ 2,040 Mutual funds: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Domestic stock funds ​ 10,910 ​ — ​ ​ — 10,910 ​ 8,088 ​ — ​ ​ — 8,088 International stock funds ​ 1,687 ​ — ​ ​ — 1,687 ​ 1,440 ​ — ​ ​ — 1,440 Target funds ​ 23 ​ — ​ ​ — 23 ​ 114 ​ — ​ ​ — 114 Bond funds ​ 146 ​ — ​ ​ — 146 ​ 147 ​ — ​ ​ — 147 Alternative funds ​ ​ 483 ​ ​ — ​ ​ — ​ ​ 483 ​ ​ 482 ​ ​ — ​ ​ — ​ ​ 482 Total mutual funds ​ 13,249 ​ — ​ ​ — 13,249 ​ 10,271 ​ — ​ ​ — 10,271 Total ​ $ 35,441 ​ $ 26,302 ​ $ 3,785 ​ $ 65,528 ​ $ 23,138 ​ $ 20,867 ​ $ 2,040 ​ $ 46,045 Assets at fair value ​ $ 35,441 ​ $ 26,302 ​ $ 3,785 $ 65,528 ​ $ 23,138 ​ $ 20,867 ​ $ 2,040 $ 46,045 ​ From the assets measured at fair value as of December 25, 2021, listed in the table above, $9.0 million of money market funds are held in Cash and Cash Equivalents, $36.5 million of mutual funds, equity securities, and alternative investments are held in Investments, $0.7 million of money market and mutual funds are held in Other Assets for our deferred compensation plan, and $18.9 million of fixed income funds and $0.4 million of money market funds are held in Restricted Investments. We maintain money market, mutual funds, bonds, and/or stocks in our non-qualified deferred compensation plan and 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 2018, we purchased a private real estate income trust which is valued as a Level 3 asset and is categorized as an “Alternative Investment.” In accordance with our investment policy, our wholly-owned company, Ardellis Insurance Ltd. ("Ardellis"), maintains an investment portfolio, totaling $55.4 million as of December 25, 2021, consisting of domestic and international stocks, 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 25, 2021 ​ December 26, 2020 ​ ​ ​ ​ Unrealized ​ ​ ​ ​ ​ Unrealized ​ ​ ​ Cost Gain Fair Value Cost Gain Fair Value Fixed Income ​ $ 18,169 $ 409 $ 18,578 ​ $ 15,325 $ 1,145 $ 16,470 Treasury Securities ​ ​ 342 ​ ​ — ​ ​ 342 ​ ​ — ​ ​ — ​ ​ — Equity ​ 15,196 ​ 4,967 20,163 ​ 9,787 ​ 2,815 12,602 Mutual Funds ​ ​ 9,222 ​ ​ 3,325 ​ 12,547 ​ ​ 8,235 ​ ​ 1,430 ​ 9,665 Alternative Investments ​ ​ 3,003 ​ ​ 782 ​ 3,785 ​ ​ 1,904 ​ ​ 136 ​ 2,040 Total ​ $ 45,932 ​ $ 9,483 $ 55,415 ​ $ 35,251 ​ $ 5,526 $ 40,777 ​ 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 alternative investments consist of the private real estate income trust which is valued as a Level 3 asset. The net pre-tax unrealized gain was $9.5 million for the year ended December 25, 2021. Carrying amounts above are recorded in the investments and restricted investments line items within the balance sheet as of December 25, 2021 and December 26, 2020.

BUSINESS COMBINATIONS

BUSINESS COMBINATIONS	12 Months Ended
	Dec. 25, 2021
BUSINESS COMBINATIONS	C. BUSINESS COMBINATIONS We completed the following business combinations in fiscal 2021 and 2020, which were accounted for using the purchase method (in thousands). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net ​ Company Acquisition ​ Intangible Tangible Operating Name Date Purchase Price Assets Assets Segment ​ December 20, 2021 $20,854 $ 11,481 $ 9,373 Industrial Advantage Labels & Packaging, Inc. (Advantage) Based in Grand Rapids, Michigan, Advantage provides blank and customized labels, printers, label applicators and other packaging supplies. Key industries served by the company include beer and beverage; body armor; food production and processing; greenhouse and nursery; hobby and craft; manufacturing; and automotive. The company had trailing 12-month sales through November 2021 of approximately $19.8 million. ​ November 22, 2021 $11,155 $ 9,106 $ 2,049 Other Ficus Pax Private Limited (Ficus) Headquartered in Bangalore, India, Ficus manufactures mixed-material cases and crates, nail-less plywood boxes, wooden pallets and other packaging products through 10 facilities located in major industrial markets throughout southern India. Ficus also owns a majority stake in Wadpack, a manufacturer of corrugated fiber board containers, corrugated pallets and display solutions. The company had trailing 12-month sales through August 2021 of approximately $39 million USD. ​ November 1, 2021 $5,984 $ 5,681 $ 303 Other Boxpack Packaging (Boxpack) Based near Melbourne, Australia, Boxpack specializes in flexographic and lithographic cardboard packaging, using the latest CAD design and finishing techniques. Boxpack serves multiple industries, including food and beverage, confectionary, pharmaceutical, industrial and agricultural. The company had trailing 12-month sales through June 30, 2021, of $8.2 million AUD. ​ September 27, 2021 $6,443 $ 4,039 $ 2,404 Construction Shelter Products, Inc. (Shelter) Based in Haleyville, Alabama, Shelter operates its distribution and logistics business from an 87,800 sq.-ft. warehouse that specializes in manufactured housing industry customers. Shelter’s facility is adjacent to a UFP manufacturing facility that supplies trusses to manufactured housing builders, and the proximity will enable additional operational synergies. The Company had sales of approximately $11.4 million in 2020. ​ April 29, 2021 $10,129 $ 7,099 $ 3,030 Construction Endurable Building Products, LLC (Endurable) Based near Minneapolis, Minnesota, Endurable is a leading manufacturer of customized structural aluminum systems and products for exterior purposes, such as deck framing, balconies, sunshades, railings and stairs. The company’s trademarked alumiLAST aluminum deck and balcony systems are known for their low-maintenance design and ease of installation. Endurable serves general contractors in the multifamily market throughout the U.S. and had sales of approximately $15 million in 2020. ​ April 19, 2021 $8,549 $ 1,526 $ 7,023 Retail Walnut Hollow Farm, Inc. Walnut Hollow Farm, located in Wisconsin, is engaged in the business of designing, manufacturing, selling, and distributing wood products, tools, and accessories for the craft and hobby, outdoor sportsman art, personalized home décor, and hardware categories, with sales of approximately $11.6 million in 2020. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net ​ Company Acquisition ​ Intangible Tangible Operating Name Date Purchase Price Assets Assets Segment ​ April 12, 2021 $153,462 $ — $ 153,462 Retail Spartanburg Forest Products, Inc. Headquartered in Greer, South Carolina, Spartanburg Forest Products and its affiliates are a premier wood treating operation in the U.S., with approximately 150 employees and operations in five states. Its affiliates include Appalachian Forest Products, Innovative Design Industries, Blue Ridge Wood Preserving, Blue Ridge Wood Products, and Tidewater Wood Products and had combined sales of approximately $543.0 million in 2020. ​ March 1, 2021 $4,724 $ 4,264 $ 460 Other J.C. Gilmore Pty Ltd (Gilmores) Founded in 1988 and operating from its distribution facility in Port Melbourne, Australia, Gilmores is a leading distributor in the industrial and construction industries of packaging tapes, stretch films, packaging equipment, strapping, construction protection products and other items, with 2020 sales of $15 million AUD ($10 million USD). ​ December 28, 2020 $259,011 $ 79,917 $ 179,094 Retail/Industrial PalletOne, Inc. (PalletOne) Based in Bartow, Florida, PalletOne is a leading manufacturer of new pallets in the U.S., with 17 pallet manufacturing facilities in the southern and eastern regions of the country. The company also supplies other specialized industrial packaging, including custom bins and crates, and its Sunbelt Forest Products (Sunbelt) subsidiary operates five pressure-treating facilities in the Southeastern U.S. PalletOne and its affiliates had 2020 sales of ​ November 10, 2020 $21,268 $ 11,923 $ 9,345 Construction Atlantic Prefab, Inc.; Exterior Designs, LLC; and Patriot Building Systems, LLC Based in Wilton, New Hampshire, Atlantic Prefab produces prefabricated steel wall panels and light gauge metal trusses. The company’s steel component and prefinished wall panel lines are new, value-added product additions for UFP Construction that help shorten project timelines. Exterior Designs is a leading installer of siding and exterior cladding such as fiber cement, ACM (aluminum composite material) panels, phenolic panels, and EIFS (exterior insulation and finish systems). The company is based in Londonderry, New Hampshire, and serves commercial and multi-family clients throughout the Northeast. Also based in Londonderry, Patriot Building Systems provides commercial and multi-family framing services in the Northeast and will focus on markets not currently served by companies of UFP Industries. The companies had combined annual sales of approximately $28 million. ​ October 1, 2020 $5,936 $ 5,222 $ 714 Retail Fire Retardant Chemical Technologies, LLC (FRCT) Founded in 2014 and based in Matthews, North Carolina, FRCT’s business includes a research and development laboratory specializing in developing and testing a wide range of high-performance chemicals, including fire retardants and water repellants. The company had annual sales of approximately $6.4 million. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net ​ Company Acquisition ​ Intangible Tangible Operating Name Date Purchase Price Assets Assets Segment ​ September 30, 2020 $3,475 $ 7,267 $ (1,369) Other Enwrap Logistic & Packaging S.r.l. (Enwrap) Enwrap is a newly formed company dedicated to the logistics and packaging business of its predecessor, Job Service S.p.A. Headquartered in Milan, Italy, Enwrap provides high-value, mixed material industrial packaging and logistics services through eight locations in Italy. These locations generated annual sales of approximately $14 million. ​ July 14, 2020 $18,496 $ 12,458 $ 6,038 Industrial T&R Lumber Company (T&R) A manufacturer and distributor of a range of products used primarily by nurseries, including plastic growing containers, pots and trays; wooden stakes; trellises; tree boxes; shipping racks; and other nursery supplies based in Rancho Cucamonga, California. T&R had annual sales of approximately $31 million. The acquisition of T&R will allow us to leverage their expertise using our national manufacturing capacity to grow our agricultural product offerings and customer base across the country. ​ March 13, 2020 $22,951 $ 20,262 $ 2,689 Construction Quest Design & Fabrication and Quest Architectural Millwork (Quest) A designer, fabricator, and installer of premium millwork and case goods for a variety of commercial uses. Quest had annual sales of approximately $22 million. The acquisition of Quest expands our architectural millwork capabilities and expertise in our commercial construction business unit, and will allow us to use our national manufacturing capacity to grow and diversify our sales to this end market ​ The intangible assets for each acquisition were finalized and allocated to their respective identifiable intangible asset and goodwill accounts during 2021, except for our 2021 acquisitions. In aggregate, acquisitions made during 2021 and 2020, contributed approximately $1.2 billion in net sales and $50.5 million in operating profit during 2021. At December 25, 2021, the amounts assigned to major intangible classes for the business combinations mentioned above are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Non- ​ ​ ​ ​ ​ ​ ​ ​ ​ Intangibles - ​ ​ Compete ​ ​ ​ Customer ​ ​ ​ ​ ​ ​ Tax ​ ​ Agreements ​ Patents ​ Relationships ​ Tradename ​ Goodwill ​ Deductible Advantage ​ $ — ​ $ — ​ $ — ​ $ — ​ $ 11,481 * $ 11,481 Ficus ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 8,889 * ​ 8,889 Boxpack ​ ​ — ​ ​ — ​ ​ 2,694 * ​ — ​ ​ 1,978 * ​ 4,672 Shelter ​ ​ — ​ ​ — ​ ​ 2,019 * ​ — ​ ​ 2,020 * ​ 4,039 Endurable ​ ​ — ​ ​ — ​ ​ 4,617 * ​ — ​ ​ 2,482 * ​ 7,099 Walnut Hollow ​ ​ — ​ ​ — ​ ​ 1,263 * ​ — ​ ​ 263 * ​ 1,526 Gilmores ​ ​ — ​ ​ — ​ ​ 1,938 * ​ — ​ ​ 1,938 * ​ 3,876 PalletOne ​ ​ — ​ ​ — ​ ​ 18,089 ​ ​ 17,450 ​ ​ 44,378 ​ ​ 79,917 Atlantic Prefab ​ ​ 417 ​ ​ — ​ ​ 1,620 ​ ​ 150 ​ ​ 1,356 ​ ​ 3,543 Exterior Designs ​ ​ 667 ​ ​ — ​ ​ 2,592 ​ ​ 240 ​ ​ 2,241 ​ ​ 5,740 Patriot Building Systems ​ ​ 306 ​ ​ — ​ ​ 1,188 ​ ​ 110 ​ ​ 1,036 ​ ​ 2,640 FRCT ​ ​ 1,090 ​ ​ — ​ ​ 1,960 ​ ​ 210 ​ ​ 1,962 ​ ​ 5,222 Enwrap ​ ​ 790 ​ ​ 1,293 ​ ​ 558 ​ ​ 474 ​ ​ 3,705 ​ ​ 6,820 T&R ​ ​ 600 ​ ​ — ​ ​ 5,000 ​ ​ 2,600 ​ ​ 4,258 ​ ​ 12,458 Quest ​ ​ — ​ ​ — ​ ​ 10,318 ​ ​ 1,903 ​ ​ 8,041 ​ ​ 20,262 ​ *(estimate) ​ The business combinations mentioned above were not significant to our operating results individually or in aggregate, and thus pro forma results for 2021 and 2020 are not presented.

GOODWILL AND OTHER INTANGIBLE A

GOODWILL AND OTHER INTANGIBLE ASSETS	12 Months Ended
	Dec. 25, 2021
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 25, 2021 and December 26, 2020, are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Retail Industrial Construction All Other Corporate Total Balance as of December 28, 2019 $ 58,098 $ 81,276 $ 82,911 $ 7,251 ​ $ — $ 229,536 2020 Acquisitions ​ 3,643 ​ ​ 6,549 ​ ​ 18,902 ​ ​ 4,441 ​ ​ — ​ 33,535 2020 Purchase Accounting Adjustments ​ ​ 202 ​ ​ 2 ​ ​ — ​ ​ — ​ ​ — ​ ​ 204 2020 Impairments ​ ​ — ​ ​ — ​ ​ (11,485) ​ ​ — ​ ​ — ​ ​ (11,485) Foreign Exchange, Net ​ — ​ ​ — ​ ​ 401 ​ ​ 2 ​ ​ — ​ 403 Balance as of December 26, 2020 $ 61,943 $ 87,827 $ 90,729 $ 11,694 ​ $ — $ 252,193 2021 Acquisitions ​ 13,115 ​ ​ 43,006 ​ ​ 4,502 ​ ​ 13,880 ​ ​ — ​ 74,503 2021 Purchase Accounting Adjustments ​ ​ (1,682) ​ ​ (2,292) ​ ​ (6,228) ​ ​ (478) ​ ​ — ​ ​ (10,680) Foreign Exchange, Net ​ — ​ ​ — ​ ​ (3) ​ ​ (975) ​ ​ — ​ (978) Balance as of December 25, 2021 ​ $ 73,376 $ 128,541 ​ $ 89,000 ​ $ 24,121 ​ $ — ​ $ 315,038 ​ As of the date of the most recent goodwill impairment test, which utilized data and assumptions as of September 25, 2021, all reporting units had fair values that were substantially in excess of their carrying values. In the prior year, we experienced significantly lower than expected operating results within our commercial reporting unit, which is within the Construction segment. It was determined that the carrying value of the reporting unit exceeded its fair value and we recorded a non-cash goodwill impairment charge of $11.5 million as of December 26, 2020, which represented the entire amount of the goodwill recorded within the reporting unit, as a result. Indefinite-lived intangible assets totaled $7.4 million as of December 25, 2021 and December 26, 2020 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 25, 2021 and December 26, 2020 (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 ​ 2020 ​ ​ ​ Accumulated ​ ​ ​ ​ Accumulated ​ ​ ​ ​ Assets ​ Amortization ​ Net Value ​ Assets ​ Amortization ​ Net Value Non-compete agreements ​ $ 8,490 ​ $ (4,160) ​ $ 4,330 ​ $ 4,847 ​ $ (2,728) ​ $ 2,119 Customer relationships and other ​ 101,158 ​ (25,012) ​ ​ 76,146 ​ 80,343 ​ (17,021) ​ ​ 63,322 Licensing agreements ​ 4,589 ​ (4,589) ​ ​ — ​ 4,589 ​ (4,589) ​ ​ — Patents ​ 3,221 ​ (1,137) ​ ​ 2,084 ​ 965 ​ (509) ​ ​ 456 Tradename ​ ​ 30,392 ​ ​ (4,599) ​ ​ 25,793 ​ ​ 8,019 ​ ​ (2,123) ​ ​ 5,896 Software ​ ​ 959 ​ ​ (295) ​ ​ 664 ​ ​ 505 ​ ​ (46) ​ ​ 459 Total ​ $ 148,809 ​ $ (39,792) ​ $ 109,017 ​ $ 99,268 ​ $ (27,016) ​ $ 72,252 ​ 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 3 to 15 years 7.8 years Customer relationship 5 to 15 years 9.7 years Licensing agreements 10 years 10 years Patents ​ 10 years ​ 10 years Tradename (amortizable) 5 to 15 years 11 years Software ​ 3 to 5 years ​ 3.5 years ​ Amortization expense of intangibles totaled $13.9 million, $8.7 million and $6.3 million in 2021, 2020 and 2019, respectively. The estimated amortization expense for intangibles for each of the five succeeding fiscal years is as follows (in thousands): ​ ​ ​ ​ 2022 $ 13,734 2023 ​ 12,878 2024 ​ 12,409 2025 ​ 11,901 2026 ​ 10,944 Thereafter ​ 47,151 Total ​ $ 109,017 ​

DEBT

DEBT	12 Months Ended
	Dec. 25, 2021
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 led by JPMorgan Chase Bank, N.A., as administrative agent and Wells Fargo Bank, N.A., as syndication agent. The facilities include up to $40 million which may be advanced in the form of letters of credit, and up to $100 million (U.S. dollar equivalent) which may be advanced in Canadian dollars, Australian dollars, pounds Sterling, Euros and such other foreign currencies as may subsequently be agreed upon among the parties. Cash borrowings are charged interest based upon an index selected by the Company, plus a margin that is determined based upon the index selected and upon the financial performance of the Company and certain of its subsidiaries. We are charged a facility fee on the entire amount of the lending commitment, at a per annum rate ranging from 12.5 to 30.0 basis points, also determined based upon our performance. The facility fee is payable quarterly in arrears. On February 28, 2021, our credit agreement was amended to increase the availability from $375 million to $550 million by exercising the accordion feature in the original agreement. 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. Proceeds from the sale of the Series E, F and G Senior Notes were used to fund the acquisition of PalletOne in January 2021. Outstanding letters of credit extended on our behalf on December 25, 2021 and December 26, 2020 aggregated $54.2 million and $41.0 million; respectively, which includes approximately $7.1 million related to industrial development revenue bonds. We had an outstanding balance of $7.8 million and $4.7 million, which includes foreign subsidiary borrowings, on the revolver at December 25, 2021, and December 26, 2020, respectively. After considering letters of credit, we had $535.1 million and $363.2 million in remaining availability on the revolver on December 25, 2021, and December 26, 2020, respectively. Letters of credit have one-year terms, include an automatic renewal clause, and are charged an annual interest rate of 112.5 basis points, based upon our financial performance. Long-term debt obligations are summarized as follows on December 25, 2021 and December 26, 2020 (amounts in thousands): ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 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 A, due on December 17, 2022, interest payable semi-annually at 3.89% ​ ​ 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 November 1, 2023, interest payable monthly at a floating rate (1.06% on December 25, 2021 and 1.125% on December 26, 2020) ​ ​ 7,818 ​ ​ 4,715 Series 1999 Industrial Development Revenue Bonds, due on August 1, 2029, interest payable monthly at a floating rate (0.14% on December 25, 2021 and 0.20% on December 26, 2020) ​ 3,300 ​ 3,300 Series 2002 Industrial Development Revenue Bonds, due on December 1, 2022, interest payable monthly at a floating rate (0.18% on December 25, 2021 and 0.22% on December 26, 2020) ​ 3,700 ​ 3,700 Finance leases and foreign affiliate debt ​ 5,544 ​ 138 ​ ​ 320,362 ​ 311,853 Less current portion ​ (42,683) ​ (100) Less debt issuance costs ​ (112) ​ (146) Long-term portion ​ $ 277,567 ​ $ 311,607 ​ 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 25, 2021 and December 26, 2020. On December 25, 2021, the principal maturities of long-term debt and finance lease obligations are as follows (in thousands): ​ ​ ​ ​ 2022 $ 42,683 2023 ​ 8,863 2024 ​ 40,214 2025 ​ — 2026 ​ 302 Thereafter ​ 228,300 Total ​ $ 320,362 ​ On December 25, 2021, the estimated fair value of our long-term debt, including the current portion, was $334.6 million, which was $14.3 million more 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. 25, 2021
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 25, 2021. ​ As of December 25, 2021, 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 25, 2021. 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 revolver and 10-12-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 25, 2021 and December 26, 2020 are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 ​ ​ 2020 Operating lease cost ​ $ 30,054 ​ $ 21,594 Short-term lease cost ​ 5,264 ​ 2,863 Variable lease cost ​ 4,761 ​ 3,985 Sublease income ​ (3,109) ​ (1,013) Total lease cost ​ $ 36,970 ​ $ 27,429 ​ The amounts paid for operating leases, included in the measurement of lease liabilities, were $27.4 million in the year ended December 25, 2021 and $20.0 million in the year ended December 26, 2020. In addition, right-of-use assets obtained in exchange for new operating lease liabilities were approximately $46.7 million and $12.8 million, respectively, for the years ended December 25, 2021 and December 29, 2019. ​ Future minimum payments under non-cancelable operating leases on December 25, 2021 are as follows (in thousands): ​ ​ ​ ​ ​ Operating ​ ​ Leases 2022 ​ $ 26,378 2023 ​ 21,040 2024 ​ 15,842 2025 ​ 13,164 2026 ​ 11,140 Thereafter ​ 27,123 Total minimum lease payments ​ $ 114,687 Less present value discount ​ ​ (14,900) Total lease liability ​ $ 99,787 ​ Rent expense was approximately $40.1 million, $28.4 million, and $29.9 million in 2021, 2020, and 2019, respectively. As of December 25, 2021 and December 26, 2020, the weighted average lease term for operating leases was 7.33 years and 6.84 years, respectively. Similarly, the weighted average discount rate for operating leases was 2.87% and 3.12%, respectively.

DEFERRED COMPENSATION

DEFERRED COMPENSATION	12 Months Ended
	Dec. 25, 2021
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. The remaining deferred compensation liability on December 25, 2021 and December 26, 2020 was $0.2 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 25, 2021 and December 26, 2020, was $12.7 million and $13.3 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. 25, 2021
COMMON STOCK	H. COMMON STOCK We maintain and administer our shareholder approved Employee Stock Purchase Plan ("Stock Purchase Plan"). The 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 Directors’ Retainer Stock Plan ("Stock Retainer Plan"). The Stock Retainer Plan allows eligible members of the Board of Directors to defer the cash portion of their retainer and committee fees 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 $1.7 million in 2021, and $1.8 million in both 2020 and 2019. 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 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. There is no unrecognized compensation expense remaining for stock options in 2021, 2020, and 2019. Below is a summary of common stock issuances for 2021 and 2020: ​ ​ ​ ​ ​ ​ ​ ​ December 25, 2021 Share Issuance Activity Common Stock ​ ​ Average Share Price Shares issued under the employee stock purchase plan ​ 33 ​ $ 75.18 ​ ​ ​ ​ ​ ​ Shares issued under the employee stock gift program ​ 2 ​ ​ 78.37 Shares issued under the director retainer stock program ​ 5 ​ ​ 72.66 Shares issued under the bonus plan ​ 487 ​ ​ 59.56 Shares issued under the executive stock match plan ​ 77 ​ ​ 60.24 Forfeitures ​ (24) ​ ​ ​ Total shares issued under stock grant programs ​ 547 ​ $ 59.84 ​ ​ ​ ​ ​ ​ Shares issued under the deferred compensation plans ​ 117 ​ $ 64.14 ​ ​ ​ ​ ​ ​ ​ ​ December 26, 2020 Share Issuance Activity Common Stock ​ ​ Average Share Price Shares issued under the employee stock purchase plan ​ 35 ​ $ 46.71 ​ ​ ​ ​ ​ ​ Shares issued under the employee stock gift program ​ 3 ​ ​ 48.10 Shares issued under the director retainer stock program ​ 46 ​ ​ 25.31 Shares issued under the bonus plan ​ 271 ​ ​ 47.52 Shares issued under the executive stock grants plan ​ 79 ​ ​ 47.60 Forfeitures ​ (9) ​ ​ ​ Total shares issued under stock grant programs ​ 390 ​ $ 44.96 ​ ​ ​ ​ ​ ​ Shares issued under the deferred compensation plans ​ 128 ​ $ 53.79 ​ 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 29, 2018 1,160,079 $ 23.32 $ 7.6 1.12 years Granted 318,496 ​ 32.60 ​ Vested (224,894) ​ 23.42 ​ Forfeited (50,786) ​ 24.18 ​ Nonvested at December 28, 2019 1,202,895 $ 29.68 $ 7.9 0.86 years Granted 348,016 ​ 47.60 ​ Vested (177,790) ​ 22.69 ​ Forfeited (9,327) ​ 33.46 ​ 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 ​ Under the Stock Purchase Plan and LTSIP, we recognized share-based compensation expense of $11.2 million, $4.0 million, and $4.0 million and the related total income tax benefits of $2.7 million, $1.0 million, and $0.8 million in 2021, 2020 and 2019, respectively. For the year-ended December 25, 2021, we determined that $60 million of share-based bonus awards, representing 751,978 shares, will be awarded to qualified employees as it relates to the company’s 2021 performance and granted in 2022. Awards granted generally vest after a period of three five In 2021, 2020 and 2019, cash received from share issuances under our plans was $2.1 million, $1.4 million and $1.1 million, respectively. Effective February 15, 2022, our Board authorized an additional 1.5 million shares to be repurchased under our existing share repurchase program. We repurchased no

RETIREMENT PLANS

RETIREMENT PLANS	12 Months Ended
	Dec. 25, 2021
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 2021, 2020, and 2019, on a discretionary basis, totaling $9.2 million, $7.2 million, and $6.5 million respectively. Included within the total employee matched contribution was an additional matched contribution for hourly employees of $3.7 million, $2.9 million and $2.6 million for 2021, 2020 and 2019, 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 $13.1 million and $11.8 million are accrued in “Other Liabilities” for this plan on December 25, 2021 and December 26, 2020, respectively.

INCOME TAXES

INCOME TAXES	12 Months Ended
	Dec. 25, 2021
INCOME TAXES	J. INCOME TAXES Income tax provisions for the years ended December 25, 2021, December 26, 2020, and December 28, 2019 are summarized as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 ​ 2020 2019 Currently Payable: ​ ​ ​ Federal ​ $ 115,077 ​ $ 59,055 ​ $ 35,267 State and local ​ 30,441 ​ 16,709 ​ 10,071 Foreign ​ 21,095 ​ 8,601 ​ 5,834 ​ ​ 166,613 ​ 84,365 ​ 51,172 Net Deferred: ​ ​ ​ Federal ​ 6,242 ​ 2,292 ​ 6,895 State and local ​ 118 ​ (1,518) ​ 805 Foreign ​ 999 ​ 1,962 ​ (602) ​ ​ 7,359 ​ 2,736 ​ 7,098 Total income tax expense ​ $ 173,972 ​ $ 87,101 ​ $ 58,270 ​ The components of earnings before income taxes consist of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 2019 U.S. ​ $ 645,316 ​ $ 308,167 ​ $ 220,532 Foreign ​ 81,020 ​ 32,816 ​ 20,142 Total ​ $ 726,336 ​ $ 340,983 ​ $ 240,674 ​ The effective income tax rates are different from the statutory federal income tax rates for the following reasons: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 2019 Statutory federal income tax rate 21.0 % 21.0 % 21.0 % State and local taxes (net of federal benefits) 3.3 3.4 3.9 ​ Effect of noncontrolling owned interest in earnings of partnerships n/a n/a (0.1) ​ Tax credits, including foreign tax credit (0.6) (0.9) (1.3) ​ Change in uncertain tax positions reserve (0.1) (0.1) (0.1) ​ Other permanent differences (0.4) 0.6 0.5 ​ Other, net 0.7 1.5 0.3 ​ Effective income tax rate 23.9 % 25.5 % 24.2 % ​ Temporary differences which give rise to deferred income tax assets and (liabilities) on December 25, 2021 and December 26, 2020 are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 Employee benefits ​ $ 27,543 ​ $ 23,236 Lease liability ​ ​ 24,627 ​ ​ 19,376 Net operating loss carryforwards ​ 5,502 ​ 6,463 Foreign subsidiary capital loss carryforward ​ 527 ​ 527 Other tax credits ​ 450 ​ 391 Inventory ​ 2,007 ​ 1,633 Reserves on receivables ​ 1,446 ​ 1,630 Accrued expenses ​ 5,735 ​ 3,071 Other, net ​ 5,233 ​ 8,483 Gross deferred income tax assets ​ 73,070 ​ 64,810 Valuation allowance ​ (3,952) ​ (4,044) Deferred income tax assets ​ 69,118 ​ 60,766 Depreciation ​ (64,387) ​ (41,403) Intangibles ​ (38,367) ​ (22,840) Right of use assets ​ ​ (23,866) ​ ​ (19,376) Deferred income tax liabilities ​ (126,620) ​ (83,619) Net deferred income tax liability ​ $ (57,502) ​ $ (22,853) ​ As of December 25, 2021, we had federal, state and foreign net operating loss carryforwards of $5.5 million and state tax credit carryforwards of $0.5 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 2022 - 2026 ​ $ — ​ $ — ​ $ 536 ​ $ — ​ $ — 2027 - 2031 ​ — ​ ​ 436 ​ ​ 1,424 ​ — ​ — 2032 - 2036 ​ — ​ ​ 670 ​ ​ 106 ​ — ​ 450 2037 - 2041 ​ 790 ​ ​ 808 ​ ​ — ​ — ​ — Thereafter ​ — ​ ​ 438 ​ ​ 294 ​ — ​ — Total ​ $ 790 ​ $ 2,352 ​ $ 2,360 ​ $ — ​ $ 450 ​ As of December 25, 2021, 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 $3.4 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.

ACCOUNTING FOR UNCERTAINTY IN I

ACCOUNTING FOR UNCERTAINTY IN INCOME TAXES	12 Months Ended
	Dec. 25, 2021
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): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 2019 Gross unrecognized tax benefits beginning of year ​ $ 3,892 ​ $ 4,166 ​ $ 4,378 Increase in tax positions for prior years ​ 437 ​ (82) ​ (129) Increase in tax positions for current year ​ 839 ​ 730 ​ 768 Lapse in statute of limitations ​ (1,565) ​ (922) ​ (851) Gross unrecognized tax benefits end of year ​ $ 3,603 ​ $ 3,892 ​ $ 4,166 ​ 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 $0.5 million for each of the years December 25, 2021, December 26, 2020, and December 28, 2019. 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 2017. 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 in the next twelve months $1.1 million.

COMMITMENTS, CONTINGENCIES, AND

COMMITMENTS, CONTINGENCIES, AND GUARANTEES	12 Months Ended
	Dec. 25, 2021
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 25, 2021, 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 25, 2021, we had outstanding purchase commitments on commenced capital projects of approximately $52.7 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, some of which are no longer in business. 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 25, 2021, we had approximately $31.5 million in outstanding payment and performance bonds for open projects. We had approximately $10.7 million in payment and performance bonds outstanding for completed projects which are still under warranty. On December 25, 2021, we had outstanding letters of credit totaling $54.2 million, primarily related to certain insurance contracts and industrial development revenue bonds described further below. In lieu of cash deposits, we provide irrevocable letters of credit in favor of our insurers and other lenders to guarantee our performance under certain contracts. We currently have irrevocable letters of credit outstanding totaling approximately $47.1 million for these types of arrangements. We have reserves recorded on our balance sheet, in accrued liabilities, that reflect our expected future liabilities under these 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 $7.1 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 2021 which would require us to recognize a liability on our balance sheet.

SEGMENT REPORTING

SEGMENT REPORTING	12 Months Ended
	Dec. 25, 2021
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 Industrial 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, Industrial, and Construction segments. Two customers, The Home Depot and Lowes, accounted for approximately 16% and 10%, respectively, of our total net sales in fiscal 2021. These customers accounted for approximately 24% and 4%, respectively, of our total net sales in fiscal 2020 and 19% and 4%, respectively, in 2019. The exception to this market-centered reporting and management structure is our International segment, which comprises our Mexico, Canada, Europe, India, 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. “Corporate” includes purchasing, transportation and administrative functions that serve our operating segments. Operating results of Corporate primarily consist net sales to external customers initiated by UFP Purchasing and UFP Transportation and over (under) allocated costs. The operating results of UFP Real Estate, Inc., which owns and leases real estate, and UFP Transportation Ltd., which owns, leases and operates transportation equipment, are also included in the Corporate column. Inter-company lease and service charges are assessed to our operating segments for the use of these assets and services at fair market value rates. Total assets in the Corporate column include unallocated cash and cash equivalents, certain prepaid assets, certain property, equipment and other assets pertaining to the centralized activities of Corporate, UFP Real Estate, Inc., UFP Transportation Ltd, and UFP Purchasing. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ All ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Retail Industrial 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 ​ 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 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ All ​ ​ ​ ​ ​ ​ ​ Retail Industrial Construction Other Corporate Total Net sales to outside customers ​ $ 2,167,122 ​ $ 1,072,117 ​ $ 1,695,684 ​ $ 217,094 ​ $ 1,981 ​ $ 5,153,998 Intersegment net sales ​ 142,839 ​ 45,217 ​ 68,294 ​ 283,689 ​ (540,039) ​ — Interest expense ​ 2 ​ 22 ​ — ​ 90 ​ 9,197 ​ 9,311 Amortization expense ​ 1,482 ​ 4,159 ​ 2,152 ​ 877 ​ 46 ​ 8,716 Depreciation expense ​ 11,675 ​ 15,163 ​ 12,123 ​ 1,619 ​ 23,384 ​ 63,964 Segment earnings before income taxes ​ 155,364 ​ 83,430 ​ 69,092 ​ 38,333 ​ (5,236) ​ 340,983 Segment assets ​ 510,464 ​ ​ 416,487 ​ ​ 510,972 ​ ​ 196,856 ​ ​ 770,112 ​ 2,404,891 Capital expenditures ​ 16,277 ​ ​ 21,141 ​ ​ 16,902 ​ ​ 2,258 ​ ​ 32,604 ​ 89,182 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ All ​ ​ ​ ​ ​ ​ ​ Retail Industrial Construction Other Corporate Total Net sales to outside customers ​ $ 1,498,710 ​ $ 1,085,635 ​ $ 1,637,156 ​ $ 193,785 ​ $ 723 ​ $ 4,416,009 Intersegment net sales ​ 135,705 ​ 45,010 ​ 56,116 ​ 200,426 ​ (437,257) ​ — Interest expense ​ — ​ 108 ​ 16 ​ 97 ​ 8,479 ​ 8,700 Amortization expense ​ 1,380 ​ 3,034 ​ 1,164 ​ 747 ​ — ​ 6,325 Depreciation expense ​ 11,041 ​ 14,340 ​ 11,465 ​ 1,532 ​ 22,116 ​ 60,494 Segment earnings before income taxes ​ 61,708 ​ 82,913 ​ 82,407 ​ 22,025 ​ (8,379) ​ 240,674 Segment assets ​ 402,221 ​ 377,329 ​ 522,638 ​ 136,990 ​ 450,299 ​ 1,889,477 Capital expenditures ​ 15,502 ​ 20,134 ​ 16,097 ​ 2,150 ​ 31,050 ​ 84,933 ​ Information regarding principal geographic areas was as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 ​ 2020 ​ 2019 ​ ​ ​ ​ ​ Long-Lived ​ ​ ​ ​ Long-Lived ​ ​ ​ ​ Long-Lived ​ ​ ​ ​ ​ Tangible ​ ​ ​ ​ Tangible ​ ​ ​ ​ Tangible ​ Net Sales Assets Net Sales Assets Net Sales Assets United States ​ $ 8,395,737 ​ $ 679,757 ​ $ 5,022,014 ​ $ 478,325 ​ $ 4,308,618 ​ $ 469,605 Foreign ​ 240,397 ​ ​ 54,873 ​ ​ 131,984 ​ ​ 36,380 ​ ​ 107,391 ​ ​ 36,878 Total ​ $ 8,636,134 ​ $ 734,630 ​ $ 5,153,998 ​ $ 514,705 ​ $ 4,416,009 ​ $ 506,483 ​ The following table presents, for the periods indicated, our disaggregated net sales (in thousands) by business unit for each segment and our percentage of value-added and commodity-based sales to total net sales by segment. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended ​ ​ December 25, ​ December 26, ​ December 28, ​ 2021 2020 2019 Retail ​ ​ ​ ​ ​ ​ ​ ​ ​ Deckorators ​ $ 248,765 ​ $ 219,930 ​ $ 185,221 Prowood ​ 1,349,901 ​ 1,215,201 ​ 786,720 Outdoor Essentials ​ 392,826 ​ 299,684 ​ 227,767 Sunbelt ​ ​ 773,909 ​ ​ — ​ ​ — UFP Edge ​ 148,927 ​ 114,987 ​ 95,608 Handprint ​ 101,090 ​ 88,351 ​ 52,553 Retail Building Materials ​ 395,894 ​ 225,253 ​ 149,153 Other ​ 7,025 ​ 3,716 ​ 1,688 Total Retail ​ $ 3,418,337 ​ $ 2,167,122 ​ $ 1,498,710 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Industrial ​ ​ ​ ​ ​ ​ ​ ​ ​ North Industrial ​ $ 615,092 ​ $ 385,132 ​ $ 376,515 Southeast Industrial ​ ​ 395,069 ​ ​ 229,316 ​ ​ 255,419 Southwest Industrial ​ ​ 400,515 ​ ​ 238,643 ​ ​ 241,774 West Industrial ​ ​ 363,300 ​ ​ 206,022 ​ ​ 197,686 PalletOne ​ ​ 355,347 ​ ​ — ​ ​ — Protective Packaging ​ ​ 18,819 ​ ​ 13,004 ​ ​ 14,241 Total Industrial ​ $ 2,148,142 ​ $ 1,072,117 ​ $ 1,085,635 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ ​ ​ ​ ​ ​ ​ ​ ​ Factory Built ​ $ 1,098,905 ​ $ 597,017 ​ $ 479,927 Site Built ​ 1,190,393 ​ 725,899 ​ 708,767 Commercial ​ ​ 259,360 ​ ​ 221,988 ​ ​ 290,785 Concrete Forming ​ 149,776 ​ 150,780 ​ 157,677 Total Construction ​ $ 2,698,434 ​ $ 1,695,684 ​ $ 1,637,156 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ All Other ​ $ 362,473 ​ $ 217,094 ​ $ 193,785 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Corporate ​ $ 8,748 ​ $ 1,981 ​ $ 723 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total Net Sales ​ $ 8,636,134 ​ $ 5,153,998 ​ $ 4,416,009 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Value-Added ​ ​ ​ ​ ​ ​ ​ ​ ​ Retail ​ ​ 43.2% ​ ​ 53.8% ​ ​ 57.8% Industrial ​ ​ 67.7% ​ ​ 64.7% ​ ​ 66.2% Construction ​ ​ 73.0% ​ ​ 76.3% ​ ​ 81.4% All Other and Corporate ​ ​ 74.9% ​ ​ 75.6% ​ ​ 75.8% Total ​ ​ 59.7% ​ ​ 64.3% ​ ​ 69.3% ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commodity-Based ​ ​ ​ ​ ​ ​ ​ ​ ​ Retail ​ ​ 56.8% ​ ​ 46.2% ​ ​ 42.2% Industrial ​ ​ 32.3% ​ ​ 35.3% ​ ​ 33.8% Construction ​ ​ 27.0% ​ ​ 23.7% ​ ​ 18.6% All Other and Corporate ​ ​ 25.1% ​ ​ 24.4% ​ ​ 24.2% Total ​ ​ 40.3% ​ ​ 35.7% ​ ​ 30.7% ​

QUARTERLY FINANCIAL INFORMATION

QUARTERLY FINANCIAL INFORMATION (UNAUDITED)	12 Months Ended
	Dec. 25, 2021
QUARTERLY FINANCIAL INFORMATION (UNAUDITED)	N. QUARTERLY FINANCIAL INFORMATION (UNAUDITED) The following table sets forth selected financial information for all of the quarters, consisting of 13 weeks during the years ended December 25, 2021 and December 26, 2020, respectively, (in thousands, except per share data): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ First ​ Second ​ Third ​ Fourth ​ 2021 2020 2021 2020 2021 2020 2021 2020 Net sales ​ $ 1,825,004 ​ $ 1,032,062 ​ $ 2,700,541 ​ $ 1,242,001 ​ $ 2,093,784 ​ $ 1,486,227 ​ $ 2,016,805 ​ $ 1,393,708 Gross profit ​ 286,554 ​ 167,236 ​ 421,294 ​ 204,931 ​ 327,555 ​ 241,074 ​ 371,564 ​ 187,055 Net earnings ​ 104,251 ​ 40,570 ​ 175,360 ​ 69,694 ​ 125,747 ​ 78,861 ​ 147,006 ​ 64,757 Net earnings attributable to controlling interest ​ 103,311 ​ 40,159 ​ 173,382 ​ 66,463 ​ 121,041 ​ 77,204 ​ 137,906 ​ 62,952 Basic earnings per share ​ 1.67 ​ 0.65 ​ 2.79 ​ 1.08 ​ 1.94 ​ 1.25 ​ 2.21 ​ 1.02 Diluted earnings per share ​ 1.67 ​ 0.65 ​ 2.78 ​ 1.08 ​ 1.94 ​ 1.25 ​ 2.21 ​ 1.02 ​

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	12 Months Ended
	Dec. 25, 2021
SUBSEQUENT EVENTS	O. SUBSEQUENT EVENTS On December 27, 2021, we closed on an agreement to purchase 100 percent of the equity of Ultra Aluminum Manufacturing, Inc. (Ultra) located in Howell, Michigan for approximately $26.8 million. Ultra designs and produces an extensive selection of ornamental aluminum fence and railing products for contractors, landscapers, fence dealers and wholesalers. At this time the net tangible assets and intangible assets acquired cannot be disclosed as these are pending final valuations. Initial estimates of Ultra‘s identifiable intangibles, goodwill, and deferred taxes have been made, however, the amounts will be finalized in 2022. Effective February 15, 2022, our Board authorized an additional 1.5 million shares to be repurchased under our existing share repurchase program. Following the most recent authorization, the cumulative total authorized shares available for repurchase is approximately 2.6 million shares through the period ending February 3, 2023.

SUMMARY OF SIGNIFICANT ACCOUN_2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 25, 2021
PRINCIPLES OF CONSOLIDATION	PRINCIPLES OF CONSOLIDATION The consolidated financial statements include our accounts and those of our wholly-owned and majority-owned subsidiaries and partnerships. In addition, we consolidate any entity which we own 50% or more and exercise control. Intercompany transactions and balances have been eliminated.
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 2021, 2020, and 2019 relate to the fiscal years ended December 25, 2021, December 26, 2020, and December 28, 2019, respectively. Fiscal years 2021, 2020, and 2019 were 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 $19.3 million of restricted investments recorded as of December 25, 2021.
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 25, 2021: ​ ​ ​ ​ Allowance for possible losses on accounts receivable ​ $ 4,629 ​ $ 66,883 ​ $ (66,427) ​ $ 5,085 Year Ended December 26, 2020: ​ ​ ​ ​ Allowance for possible losses on accounts receivable ​ $ 4,440 ​ $ 48,954 ​ $ (48,765) ​ $ 4,629 Year Ended December 28, 2019: ​ ​ ​ ​ Allowance for possible losses on accounts receivable ​ $ 2,601 ​ $ 39,481 ​ $ (37,642) ​ $ 4,440 * 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 $7.8 million and $8.7 million as of December 25, 2021 and December 26, 2020, respectively. All amounts are expected to be collected within 18 months. Concentration of accounts receivable related to our two largest customers totaled $87.6 million and $97.9 million as of December 25, 2021 and December 26, 2020, respectively. In June 2016, the FASB issued ASU 2016-13, Financial Instrument-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (ASU 2016-13), which changes the current incurred loss model to a forward looking expected credit loss model for most financial assets, such as trade and other receivables, loans and other instruments. The ASU is effective for fiscal years beginning after December 15, 2019. Entities are required to apply the provisions of the standard through a cumulative-effect adjustment to retained earnings as of effective date. We have adopted the new standard as of the beginning of fiscal year 2020 and have concluded the standard does not have a material impact on our consolidated financial statements and disclosures, accounting processes, and internal controls.
INVENTORIES	INVENTORIES Inventories are stated at the lower of cost or market. The cost of inventories includes raw materials, direct labor, and manufacturing overhead. Cost is determined on a weighted average basis. 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 $37.8 million as of December 25, 2021 and $20.8 million as of December 26, 2020.
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. 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 25, 2021, all other reporting units had a fair value that was substantially in excess of the carrying value. In the fourth quarter of 2020, we recorded a non-cash goodwill impairment charge of $11.5 million related to the commercial reporting unit within our construction segment. 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 25, 2021 and December 26, 2020. 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) to certain third parties. As of December 25, 2021, Ardellis had 43 such contracts in place. Reserves associated with these contracts were $7.1 million at December 25, 2021, and $4.5 million at December 26, 2020, 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, Industrial, 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 related 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 related 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 25, December 26, ​ December 28, 2021 vs. 2020 ​ 2020 vs. 2019 ​ ​ 2021 ​ 2020 ​ 2019 ​ % Change ​ % Change FOB Shipping Point Revenue ​ $ 8,512,012 ​ $ 5,025,895 ​ $ 4,272,583 69.4% ​ 17.6% Construction Contract Revenue ​ 124,122 ​ ​ 128,103 ​ ​ 143,426 (3.1)% ​ (10.7)% Total Net Sales ​ $ 8,636,134 ​ $ 5,153,998 ​ $ 4,416,009 67.6% ​ 16.7% ​ 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 25, 2021 and December 26, 2020 which are included in “Other current assets” and “Accrued liabilities: Other”, respectively (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ December 25, ​ December 26, ​ 2021 2020 Cost and Earnings in Excess of Billings $ 5,602 $ 4,169 Billings in Excess of Cost and Earnings ​ 10,744 11,530 ​ 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 25, December 26, December 28, ​ ​ 2021 ​ 2020 ​ 2019 Numerator: ​ ​ ​ Net earnings attributable to controlling interest ​ $ 535,640 ​ $ 246,778 ​ $ 179,650 Adjustment for earnings allocated to non-vested restricted common stock ​ (17,342) ​ (6,903) ​ (4,496) Net earnings for calculating EPS ​ $ 518,298 ​ $ 239,875 ​ $ 175,154 Denominator: ​ ​ ​ Weighted average shares outstanding ​ 62,209 ​ 61,632 ​ 61,649 Adjustment for non-vested restricted common stock ​ (2,014) ​ (1,724) ​ (1,543) Shares for calculating basic EPS ​ 60,195 ​ 59,908 ​ 60,106 Effect of dilutive restricted common stock ​ 159 ​ 20 ​ 24 Shares for calculating diluted EPS ​ 60,354 ​ 59,928 ​ 60,130 Net earnings per share: ​ ​ ​ Basic ​ $ 8.61 ​ $ 4.00 ​ $ 2.91 Diluted ​ $ 8.59 ​ $ 4.00 ​ $ 2.91 ​
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 Industrial 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, Industrial, and Construction segments. Two customers, The Home Depot and Lowes, accounted for approximately 16% and 10%, respectively, of our total net sales in fiscal 2021. These customers accounted for approximately 24% and 4%, respectively, of our total net sales in fiscal 2020 and 19% and 4%, respectively, in 2019. The exception to this market-centered reporting and management structure is our International segment, which comprises our Mexico, Canada, Europe, India, 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. 25, 2021
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 25, 2021: ​ ​ ​ ​ Allowance for possible losses on accounts receivable ​ $ 4,629 ​ $ 66,883 ​ $ (66,427) ​ $ 5,085 Year Ended December 26, 2020: ​ ​ ​ ​ Allowance for possible losses on accounts receivable ​ $ 4,440 ​ $ 48,954 ​ $ (48,765) ​ $ 4,629 Year Ended December 28, 2019: ​ ​ ​ ​ Allowance for possible losses on accounts receivable ​ $ 2,601 ​ $ 39,481 ​ $ (37,642) ​ $ 4,440 * Includes accounts charged off, discounts given to customers and actual customer returns and allowances.
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 25, December 26, ​ December 28, 2021 vs. 2020 ​ 2020 vs. 2019 ​ ​ 2021 ​ 2020 ​ 2019 ​ % Change ​ % Change FOB Shipping Point Revenue ​ $ 8,512,012 ​ $ 5,025,895 ​ $ 4,272,583 69.4% ​ 17.6% Construction Contract Revenue ​ 124,122 ​ ​ 128,103 ​ ​ 143,426 (3.1)% ​ (10.7)% Total Net Sales ​ $ 8,636,134 ​ $ 5,153,998 ​ $ 4,416,009 67.6% ​ 16.7%
Schedule of Percentage of Completion Account Balances	The following table presents the balances of over time accounting accounts on December 25, 2021 and December 26, 2020 which are included in “Other current assets” and “Accrued liabilities: Other”, respectively (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ December 25, ​ December 26, ​ 2021 2020 Cost and Earnings in Excess of Billings $ 5,602 $ 4,169 Billings in Excess of Cost and Earnings ​ 10,744 11,530
Schedule of Computation of earnings per share	The computation of EPS is as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 25, December 26, December 28, ​ ​ 2021 ​ 2020 ​ 2019 Numerator: ​ ​ ​ Net earnings attributable to controlling interest ​ $ 535,640 ​ $ 246,778 ​ $ 179,650 Adjustment for earnings allocated to non-vested restricted common stock ​ (17,342) ​ (6,903) ​ (4,496) Net earnings for calculating EPS ​ $ 518,298 ​ $ 239,875 ​ $ 175,154 Denominator: ​ ​ ​ Weighted average shares outstanding ​ 62,209 ​ 61,632 ​ 61,649 Adjustment for non-vested restricted common stock ​ (2,014) ​ (1,724) ​ (1,543) Shares for calculating basic EPS ​ 60,195 ​ 59,908 ​ 60,106 Effect of dilutive restricted common stock ​ 159 ​ 20 ​ 24 Shares for calculating diluted EPS ​ 60,354 ​ 59,928 ​ 60,130 Net earnings per share: ​ ​ ​ Basic ​ $ 8.61 ​ $ 4.00 ​ $ 2.91 Diluted ​ $ 8.59 ​ $ 4.00 ​ $ 2.91

FAIR VALUE (Tables)

FAIR VALUE (Tables)	12 Months Ended
	Dec. 25, 2021
Assets measured at fair value	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 25, 2021 ​ December 26, 2020 ​ ​ 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 ​ $ 19 $ 9,392 ​ $ — $ 9,411 $ 19 $ 4,643 ​ $ — $ 4,662 Fixed income funds ​ 1,668 ​ 16,910 ​ ​ — 18,578 ​ 246 ​ 16,224 ​ ​ — 16,470 Treasury securities ​ ​ 342 ​ ​ — ​ ​ — ​ ​ 342 ​ ​ — ​ ​ — ​ ​ — ​ ​ — Equity securities ​ 20,163 ​ — ​ ​ — 20,163 ​ 12,602 ​ — ​ ​ — 12,602 Alternative investments ​ ​ — ​ ​ — ​ ​ 3,785 ​ ​ 3,785 ​ ​ — ​ ​ — ​ ​ 2,040 ​ ​ 2,040 Mutual funds: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Domestic stock funds ​ 10,910 ​ — ​ ​ — 10,910 ​ 8,088 ​ — ​ ​ — 8,088 International stock funds ​ 1,687 ​ — ​ ​ — 1,687 ​ 1,440 ​ — ​ ​ — 1,440 Target funds ​ 23 ​ — ​ ​ — 23 ​ 114 ​ — ​ ​ — 114 Bond funds ​ 146 ​ — ​ ​ — 146 ​ 147 ​ — ​ ​ — 147 Alternative funds ​ ​ 483 ​ ​ — ​ ​ — ​ ​ 483 ​ ​ 482 ​ ​ — ​ ​ — ​ ​ 482 Total mutual funds ​ 13,249 ​ — ​ ​ — 13,249 ​ 10,271 ​ — ​ ​ — 10,271 Total ​ $ 35,441 ​ $ 26,302 ​ $ 3,785 ​ $ 65,528 ​ $ 23,138 ​ $ 20,867 ​ $ 2,040 ​ $ 46,045 Assets at fair value ​ $ 35,441 ​ $ 26,302 ​ $ 3,785 $ 65,528 ​ $ 23,138 ​ $ 20,867 ​ $ 2,040 $ 46,045
Available for sale investment portfolio	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 25, 2021 ​ December 26, 2020 ​ ​ ​ ​ Unrealized ​ ​ ​ ​ ​ Unrealized ​ ​ ​ Cost Gain Fair Value Cost Gain Fair Value Fixed Income ​ $ 18,169 $ 409 $ 18,578 ​ $ 15,325 $ 1,145 $ 16,470 Treasury Securities ​ ​ 342 ​ ​ — ​ ​ 342 ​ ​ — ​ ​ — ​ ​ — Equity ​ 15,196 ​ 4,967 20,163 ​ 9,787 ​ 2,815 12,602 Mutual Funds ​ ​ 9,222 ​ ​ 3,325 ​ 12,547 ​ ​ 8,235 ​ ​ 1,430 ​ 9,665 Alternative Investments ​ ​ 3,003 ​ ​ 782 ​ 3,785 ​ ​ 1,904 ​ ​ 136 ​ 2,040 Total ​ $ 45,932 ​ $ 9,483 $ 55,415 ​ $ 35,251 ​ $ 5,526 $ 40,777

BUSINESS COMBINATIONS (Tables)

BUSINESS COMBINATIONS (Tables)	12 Months Ended
	Dec. 25, 2021
Business Acquisitions Accounted for Using Purchase Method	We completed the following business combinations in fiscal 2021 and 2020, which were accounted for using the purchase method (in thousands). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net ​ Company Acquisition ​ Intangible Tangible Operating Name Date Purchase Price Assets Assets Segment ​ December 20, 2021 $20,854 $ 11,481 $ 9,373 Industrial Advantage Labels & Packaging, Inc. (Advantage) Based in Grand Rapids, Michigan, Advantage provides blank and customized labels, printers, label applicators and other packaging supplies. Key industries served by the company include beer and beverage; body armor; food production and processing; greenhouse and nursery; hobby and craft; manufacturing; and automotive. The company had trailing 12-month sales through November 2021 of approximately $19.8 million. ​ November 22, 2021 $11,155 $ 9,106 $ 2,049 Other Ficus Pax Private Limited (Ficus) Headquartered in Bangalore, India, Ficus manufactures mixed-material cases and crates, nail-less plywood boxes, wooden pallets and other packaging products through 10 facilities located in major industrial markets throughout southern India. Ficus also owns a majority stake in Wadpack, a manufacturer of corrugated fiber board containers, corrugated pallets and display solutions. The company had trailing 12-month sales through August 2021 of approximately $39 million USD. ​ November 1, 2021 $5,984 $ 5,681 $ 303 Other Boxpack Packaging (Boxpack) Based near Melbourne, Australia, Boxpack specializes in flexographic and lithographic cardboard packaging, using the latest CAD design and finishing techniques. Boxpack serves multiple industries, including food and beverage, confectionary, pharmaceutical, industrial and agricultural. The company had trailing 12-month sales through June 30, 2021, of $8.2 million AUD. ​ September 27, 2021 $6,443 $ 4,039 $ 2,404 Construction Shelter Products, Inc. (Shelter) Based in Haleyville, Alabama, Shelter operates its distribution and logistics business from an 87,800 sq.-ft. warehouse that specializes in manufactured housing industry customers. Shelter’s facility is adjacent to a UFP manufacturing facility that supplies trusses to manufactured housing builders, and the proximity will enable additional operational synergies. The Company had sales of approximately $11.4 million in 2020. ​ April 29, 2021 $10,129 $ 7,099 $ 3,030 Construction Endurable Building Products, LLC (Endurable) Based near Minneapolis, Minnesota, Endurable is a leading manufacturer of customized structural aluminum systems and products for exterior purposes, such as deck framing, balconies, sunshades, railings and stairs. The company’s trademarked alumiLAST aluminum deck and balcony systems are known for their low-maintenance design and ease of installation. Endurable serves general contractors in the multifamily market throughout the U.S. and had sales of approximately $15 million in 2020. ​ April 19, 2021 $8,549 $ 1,526 $ 7,023 Retail Walnut Hollow Farm, Inc. Walnut Hollow Farm, located in Wisconsin, is engaged in the business of designing, manufacturing, selling, and distributing wood products, tools, and accessories for the craft and hobby, outdoor sportsman art, personalized home décor, and hardware categories, with sales of approximately $11.6 million in 2020. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net ​ Company Acquisition ​ Intangible Tangible Operating Name Date Purchase Price Assets Assets Segment ​ April 12, 2021 $153,462 $ — $ 153,462 Retail Spartanburg Forest Products, Inc. Headquartered in Greer, South Carolina, Spartanburg Forest Products and its affiliates are a premier wood treating operation in the U.S., with approximately 150 employees and operations in five states. Its affiliates include Appalachian Forest Products, Innovative Design Industries, Blue Ridge Wood Preserving, Blue Ridge Wood Products, and Tidewater Wood Products and had combined sales of approximately $543.0 million in 2020. ​ March 1, 2021 $4,724 $ 4,264 $ 460 Other J.C. Gilmore Pty Ltd (Gilmores) Founded in 1988 and operating from its distribution facility in Port Melbourne, Australia, Gilmores is a leading distributor in the industrial and construction industries of packaging tapes, stretch films, packaging equipment, strapping, construction protection products and other items, with 2020 sales of $15 million AUD ($10 million USD). ​ December 28, 2020 $259,011 $ 79,917 $ 179,094 Retail/Industrial PalletOne, Inc. (PalletOne) Based in Bartow, Florida, PalletOne is a leading manufacturer of new pallets in the U.S., with 17 pallet manufacturing facilities in the southern and eastern regions of the country. The company also supplies other specialized industrial packaging, including custom bins and crates, and its Sunbelt Forest Products (Sunbelt) subsidiary operates five pressure-treating facilities in the Southeastern U.S. PalletOne and its affiliates had 2020 sales of ​ November 10, 2020 $21,268 $ 11,923 $ 9,345 Construction Atlantic Prefab, Inc.; Exterior Designs, LLC; and Patriot Building Systems, LLC Based in Wilton, New Hampshire, Atlantic Prefab produces prefabricated steel wall panels and light gauge metal trusses. The company’s steel component and prefinished wall panel lines are new, value-added product additions for UFP Construction that help shorten project timelines. Exterior Designs is a leading installer of siding and exterior cladding such as fiber cement, ACM (aluminum composite material) panels, phenolic panels, and EIFS (exterior insulation and finish systems). The company is based in Londonderry, New Hampshire, and serves commercial and multi-family clients throughout the Northeast. Also based in Londonderry, Patriot Building Systems provides commercial and multi-family framing services in the Northeast and will focus on markets not currently served by companies of UFP Industries. The companies had combined annual sales of approximately $28 million. ​ October 1, 2020 $5,936 $ 5,222 $ 714 Retail Fire Retardant Chemical Technologies, LLC (FRCT) Founded in 2014 and based in Matthews, North Carolina, FRCT’s business includes a research and development laboratory specializing in developing and testing a wide range of high-performance chemicals, including fire retardants and water repellants. The company had annual sales of approximately $6.4 million. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net ​ Company Acquisition ​ Intangible Tangible Operating Name Date Purchase Price Assets Assets Segment ​ September 30, 2020 $3,475 $ 7,267 $ (1,369) Other Enwrap Logistic & Packaging S.r.l. (Enwrap) Enwrap is a newly formed company dedicated to the logistics and packaging business of its predecessor, Job Service S.p.A. Headquartered in Milan, Italy, Enwrap provides high-value, mixed material industrial packaging and logistics services through eight locations in Italy. These locations generated annual sales of approximately $14 million. ​ July 14, 2020 $18,496 $ 12,458 $ 6,038 Industrial T&R Lumber Company (T&R) A manufacturer and distributor of a range of products used primarily by nurseries, including plastic growing containers, pots and trays; wooden stakes; trellises; tree boxes; shipping racks; and other nursery supplies based in Rancho Cucamonga, California. T&R had annual sales of approximately $31 million. The acquisition of T&R will allow us to leverage their expertise using our national manufacturing capacity to grow our agricultural product offerings and customer base across the country. ​ March 13, 2020 $22,951 $ 20,262 $ 2,689 Construction Quest Design & Fabrication and Quest Architectural Millwork (Quest) A designer, fabricator, and installer of premium millwork and case goods for a variety of commercial uses. Quest had annual sales of approximately $22 million. The acquisition of Quest expands our architectural millwork capabilities and expertise in our commercial construction business unit, and will allow us to use our national manufacturing capacity to grow and diversify our sales to this end market ​
Acquired Intangible Assets	At December 25, 2021, the amounts assigned to major intangible classes for the business combinations mentioned above are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Non- ​ ​ ​ ​ ​ ​ ​ ​ ​ Intangibles - ​ ​ Compete ​ ​ ​ Customer ​ ​ ​ ​ ​ ​ Tax ​ ​ Agreements ​ Patents ​ Relationships ​ Tradename ​ Goodwill ​ Deductible Advantage ​ $ — ​ $ — ​ $ — ​ $ — ​ $ 11,481 * $ 11,481 Ficus ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 8,889 * ​ 8,889 Boxpack ​ ​ — ​ ​ — ​ ​ 2,694 * ​ — ​ ​ 1,978 * ​ 4,672 Shelter ​ ​ — ​ ​ — ​ ​ 2,019 * ​ — ​ ​ 2,020 * ​ 4,039 Endurable ​ ​ — ​ ​ — ​ ​ 4,617 * ​ — ​ ​ 2,482 * ​ 7,099 Walnut Hollow ​ ​ — ​ ​ — ​ ​ 1,263 * ​ — ​ ​ 263 * ​ 1,526 Gilmores ​ ​ — ​ ​ — ​ ​ 1,938 * ​ — ​ ​ 1,938 * ​ 3,876 PalletOne ​ ​ — ​ ​ — ​ ​ 18,089 ​ ​ 17,450 ​ ​ 44,378 ​ ​ 79,917 Atlantic Prefab ​ ​ 417 ​ ​ — ​ ​ 1,620 ​ ​ 150 ​ ​ 1,356 ​ ​ 3,543 Exterior Designs ​ ​ 667 ​ ​ — ​ ​ 2,592 ​ ​ 240 ​ ​ 2,241 ​ ​ 5,740 Patriot Building Systems ​ ​ 306 ​ ​ — ​ ​ 1,188 ​ ​ 110 ​ ​ 1,036 ​ ​ 2,640 FRCT ​ ​ 1,090 ​ ​ — ​ ​ 1,960 ​ ​ 210 ​ ​ 1,962 ​ ​ 5,222 Enwrap ​ ​ 790 ​ ​ 1,293 ​ ​ 558 ​ ​ 474 ​ ​ 3,705 ​ ​ 6,820 T&R ​ ​ 600 ​ ​ — ​ ​ 5,000 ​ ​ 2,600 ​ ​ 4,258 ​ ​ 12,458 Quest ​ ​ — ​ ​ — ​ ​ 10,318 ​ ​ 1,903 ​ ​ 8,041 ​ ​ 20,262 ​ *(estimate) ​

GOODWILL AND OTHER INTANGIBLE_2

GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)	12 Months Ended
	Dec. 25, 2021
Schedule of Goodwill by Segment	The changes in the net carrying amount of goodwill by reporting segment for the years ended December 25, 2021 and December 26, 2020, are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Retail Industrial Construction All Other Corporate Total Balance as of December 28, 2019 $ 58,098 $ 81,276 $ 82,911 $ 7,251 ​ $ — $ 229,536 2020 Acquisitions ​ 3,643 ​ ​ 6,549 ​ ​ 18,902 ​ ​ 4,441 ​ ​ — ​ 33,535 2020 Purchase Accounting Adjustments ​ ​ 202 ​ ​ 2 ​ ​ — ​ ​ — ​ ​ — ​ ​ 204 2020 Impairments ​ ​ — ​ ​ — ​ ​ (11,485) ​ ​ — ​ ​ — ​ ​ (11,485) Foreign Exchange, Net ​ — ​ ​ — ​ ​ 401 ​ ​ 2 ​ ​ — ​ 403 Balance as of December 26, 2020 $ 61,943 $ 87,827 $ 90,729 $ 11,694 ​ $ — $ 252,193 2021 Acquisitions ​ 13,115 ​ ​ 43,006 ​ ​ 4,502 ​ ​ 13,880 ​ ​ — ​ 74,503 2021 Purchase Accounting Adjustments ​ ​ (1,682) ​ ​ (2,292) ​ ​ (6,228) ​ ​ (478) ​ ​ — ​ ​ (10,680) Foreign Exchange, Net ​ — ​ ​ — ​ ​ (3) ​ ​ (975) ​ ​ — ​ (978) Balance as of December 25, 2021 ​ $ 73,376 $ 128,541 ​ $ 89,000 ​ $ 24,121 ​ $ — ​ $ 315,038
Other Intangible Assets	The following amounts were included in other amortizable intangible assets, net as of December 25, 2021 and December 26, 2020 (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 ​ 2020 ​ ​ ​ Accumulated ​ ​ ​ ​ Accumulated ​ ​ ​ ​ Assets ​ Amortization ​ Net Value ​ Assets ​ Amortization ​ Net Value Non-compete agreements ​ $ 8,490 ​ $ (4,160) ​ $ 4,330 ​ $ 4,847 ​ $ (2,728) ​ $ 2,119 Customer relationships and other ​ 101,158 ​ (25,012) ​ ​ 76,146 ​ 80,343 ​ (17,021) ​ ​ 63,322 Licensing agreements ​ 4,589 ​ (4,589) ​ ​ — ​ 4,589 ​ (4,589) ​ ​ — Patents ​ 3,221 ​ (1,137) ​ ​ 2,084 ​ 965 ​ (509) ​ ​ 456 Tradename ​ ​ 30,392 ​ ​ (4,599) ​ ​ 25,793 ​ ​ 8,019 ​ ​ (2,123) ​ ​ 5,896 Software ​ ​ 959 ​ ​ (295) ​ ​ 664 ​ ​ 505 ​ ​ (46) ​ ​ 459 Total ​ $ 148,809 ​ $ (39,792) ​ $ 109,017 ​ $ 99,268 ​ $ (27,016) ​ $ 72,252 ​
Estimated Useful Lives of Intangible Assets	​ ​ ​ ​ ​ ​ ​ ​ Weighted Average Intangible Asset Type ​ Estimated Useful Life ​ Amortization Period Non-compete agreements 3 to 15 years 7.8 years Customer relationship 5 to 15 years 9.7 years Licensing agreements 10 years 10 years Patents ​ 10 years ​ 10 years Tradename (amortizable) 5 to 15 years 11 years Software ​ 3 to 5 years ​ 3.5 years
Expected Amortization Expense	Amortization expense of intangibles totaled $13.9 million, $8.7 million and $6.3 million in 2021, 2020 and 2019, respectively. The estimated amortization expense for intangibles for each of the five succeeding fiscal years is as follows (in thousands): ​ ​ ​ ​ 2022 $ 13,734 2023 ​ 12,878 2024 ​ 12,409 2025 ​ 11,901 2026 ​ 10,944 Thereafter ​ 47,151 Total ​ $ 109,017

DEBT (Tables)

DEBT (Tables)	12 Months Ended
	Dec. 25, 2021
Long-term Debt and Capital Lease Obligations	Long-term debt obligations are summarized as follows on December 25, 2021 and December 26, 2020 (amounts in thousands): ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 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 A, due on December 17, 2022, interest payable semi-annually at 3.89% ​ ​ 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 November 1, 2023, interest payable monthly at a floating rate (1.06% on December 25, 2021 and 1.125% on December 26, 2020) ​ ​ 7,818 ​ ​ 4,715 Series 1999 Industrial Development Revenue Bonds, due on August 1, 2029, interest payable monthly at a floating rate (0.14% on December 25, 2021 and 0.20% on December 26, 2020) ​ 3,300 ​ 3,300 Series 2002 Industrial Development Revenue Bonds, due on December 1, 2022, interest payable monthly at a floating rate (0.18% on December 25, 2021 and 0.22% on December 26, 2020) ​ 3,700 ​ 3,700 Finance leases and foreign affiliate debt ​ 5,544 ​ 138 ​ ​ 320,362 ​ 311,853 Less current portion ​ (42,683) ​ (100) Less debt issuance costs ​ (112) ​ (146) Long-term portion ​ $ 277,567 ​ $ 311,607 ​
Principal Maturities of Long-term Debt and Capital Lease Obligations	On December 25, 2021, the principal maturities of long-term debt and finance lease obligations are as follows (in thousands): ​ ​ ​ ​ 2022 $ 42,683 2023 ​ 8,863 2024 ​ 40,214 2025 ​ — 2026 ​ 302 Thereafter ​ 228,300 Total ​ $ 320,362 ​

LEASES (Tables)

LEASES (Tables)	12 Months Ended
	Dec. 25, 2021
Schedule of lease costs	Lease costs under non-cancelable operating leases on December 25, 2021 and December 26, 2020 are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 ​ ​ 2020 Operating lease cost ​ $ 30,054 ​ $ 21,594 Short-term lease cost ​ 5,264 ​ 2,863 Variable lease cost ​ 4,761 ​ 3,985 Sublease income ​ (3,109) ​ (1,013) Total lease cost ​ $ 36,970 ​ $ 27,429
Future Minimum Lease Payments	Future minimum payments under non-cancelable operating leases on December 25, 2021 are as follows (in thousands): ​ ​ ​ ​ ​ Operating ​ ​ Leases 2022 ​ $ 26,378 2023 ​ 21,040 2024 ​ 15,842 2025 ​ 13,164 2026 ​ 11,140 Thereafter ​ 27,123 Total minimum lease payments ​ $ 114,687 Less present value discount ​ ​ (14,900) Total lease liability ​ $ 99,787

COMMON STOCK (Tables)

COMMON STOCK (Tables)	12 Months Ended
	Dec. 25, 2021
Schedule of common stock issuances	​ ​ ​ ​ ​ ​ ​ ​ December 25, 2021 Share Issuance Activity Common Stock ​ ​ Average Share Price Shares issued under the employee stock purchase plan ​ 33 ​ $ 75.18 ​ ​ ​ ​ ​ ​ Shares issued under the employee stock gift program ​ 2 ​ ​ 78.37 Shares issued under the director retainer stock program ​ 5 ​ ​ 72.66 Shares issued under the bonus plan ​ 487 ​ ​ 59.56 Shares issued under the executive stock match plan ​ 77 ​ ​ 60.24 Forfeitures ​ (24) ​ ​ ​ Total shares issued under stock grant programs ​ 547 ​ $ 59.84 ​ ​ ​ ​ ​ ​ Shares issued under the deferred compensation plans ​ 117 ​ $ 64.14 ​ ​ ​ ​ ​ ​ ​ ​ December 26, 2020 Share Issuance Activity Common Stock ​ ​ Average Share Price Shares issued under the employee stock purchase plan ​ 35 ​ $ 46.71 ​ ​ ​ ​ ​ ​ Shares issued under the employee stock gift program ​ 3 ​ ​ 48.10 Shares issued under the director retainer stock program ​ 46 ​ ​ 25.31 Shares issued under the bonus plan ​ 271 ​ ​ 47.52 Shares issued under the executive stock grants plan ​ 79 ​ ​ 47.60 Forfeitures ​ (9) ​ ​ ​ Total shares issued under stock grant programs ​ 390 ​ $ 44.96 ​ ​ ​ ​ ​ ​ Shares issued under the deferred compensation plans ​ 128 ​ $ 53.79 ​
Nonvested Restricted Shares Activity	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 29, 2018 1,160,079 $ 23.32 $ 7.6 1.12 years Granted 318,496 ​ 32.60 ​ Vested (224,894) ​ 23.42 ​ Forfeited (50,786) ​ 24.18 ​ Nonvested at December 28, 2019 1,202,895 $ 29.68 $ 7.9 0.86 years Granted 348,016 ​ 47.60 ​ Vested (177,790) ​ 22.69 ​ Forfeited (9,327) ​ 33.46 ​ 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

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
	Dec. 25, 2021
Components of Income Tax Expense (Benefit)	Income tax provisions for the years ended December 25, 2021, December 26, 2020, and December 28, 2019 are summarized as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 ​ 2020 2019 Currently Payable: ​ ​ ​ Federal ​ $ 115,077 ​ $ 59,055 ​ $ 35,267 State and local ​ 30,441 ​ 16,709 ​ 10,071 Foreign ​ 21,095 ​ 8,601 ​ 5,834 ​ ​ 166,613 ​ 84,365 ​ 51,172 Net Deferred: ​ ​ ​ Federal ​ 6,242 ​ 2,292 ​ 6,895 State and local ​ 118 ​ (1,518) ​ 805 Foreign ​ 999 ​ 1,962 ​ (602) ​ ​ 7,359 ​ 2,736 ​ 7,098 Total income tax expense ​ $ 173,972 ​ $ 87,101 ​ $ 58,270
Components of Earnings Before Income Taxes	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 2019 U.S. ​ $ 645,316 ​ $ 308,167 ​ $ 220,532 Foreign ​ 81,020 ​ 32,816 ​ 20,142 Total ​ $ 726,336 ​ $ 340,983 ​ $ 240,674
Effective Income Tax Rate Reconciliation	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 2019 Statutory federal income tax rate 21.0 % 21.0 % 21.0 % State and local taxes (net of federal benefits) 3.3 3.4 3.9 ​ Effect of noncontrolling owned interest in earnings of partnerships n/a n/a (0.1) ​ Tax credits, including foreign tax credit (0.6) (0.9) (1.3) ​ Change in uncertain tax positions reserve (0.1) (0.1) (0.1) ​ Other permanent differences (0.4) 0.6 0.5 ​ Other, net 0.7 1.5 0.3 ​ Effective income tax rate 23.9 % 25.5 % 24.2 %
Components of Deferred Tax Assets and Liabilities	Temporary differences which give rise to deferred income tax assets and (liabilities) on December 25, 2021 and December 26, 2020 are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 Employee benefits ​ $ 27,543 ​ $ 23,236 Lease liability ​ ​ 24,627 ​ ​ 19,376 Net operating loss carryforwards ​ 5,502 ​ 6,463 Foreign subsidiary capital loss carryforward ​ 527 ​ 527 Other tax credits ​ 450 ​ 391 Inventory ​ 2,007 ​ 1,633 Reserves on receivables ​ 1,446 ​ 1,630 Accrued expenses ​ 5,735 ​ 3,071 Other, net ​ 5,233 ​ 8,483 Gross deferred income tax assets ​ 73,070 ​ 64,810 Valuation allowance ​ (3,952) ​ (4,044) Deferred income tax assets ​ 69,118 ​ 60,766 Depreciation ​ (64,387) ​ (41,403) Intangibles ​ (38,367) ​ (22,840) Right of use assets ​ ​ (23,866) ​ ​ (19,376) Deferred income tax liabilities ​ (126,620) ​ (83,619) Net deferred income tax liability ​ $ (57,502) ​ $ (22,853)
Schedule of NOL and credit carryforwards	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net Operating Losses ​ Tax Credits ​ U.S. State Foreign U.S. State 2022 - 2026 ​ $ — ​ $ — ​ $ 536 ​ $ — ​ $ — 2027 - 2031 ​ — ​ ​ 436 ​ ​ 1,424 ​ — ​ — 2032 - 2036 ​ — ​ ​ 670 ​ ​ 106 ​ — ​ 450 2037 - 2041 ​ 790 ​ ​ 808 ​ ​ — ​ — ​ — Thereafter ​ — ​ ​ 438 ​ ​ 294 ​ — ​ — Total ​ $ 790 ​ $ 2,352 ​ $ 2,360 ​ $ — ​ $ 450

ACCOUNTING FOR UNCERTAINTY IN_2

ACCOUNTING FOR UNCERTAINTY IN INCOME TAXES (Tables)	12 Months Ended
	Dec. 25, 2021
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): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 2019 Gross unrecognized tax benefits beginning of year ​ $ 3,892 ​ $ 4,166 ​ $ 4,378 Increase in tax positions for prior years ​ 437 ​ (82) ​ (129) Increase in tax positions for current year ​ 839 ​ 730 ​ 768 Lapse in statute of limitations ​ (1,565) ​ (922) ​ (851) Gross unrecognized tax benefits end of year ​ $ 3,603 ​ $ 3,892 ​ $ 4,166

SEGMENT REPORTING (Tables)

SEGMENT REPORTING (Tables)	12 Months Ended
	Dec. 25, 2021
Segment Reporting	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ All ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Retail Industrial 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 ​ 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 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ All ​ ​ ​ ​ ​ ​ ​ Retail Industrial Construction Other Corporate Total Net sales to outside customers ​ $ 2,167,122 ​ $ 1,072,117 ​ $ 1,695,684 ​ $ 217,094 ​ $ 1,981 ​ $ 5,153,998 Intersegment net sales ​ 142,839 ​ 45,217 ​ 68,294 ​ 283,689 ​ (540,039) ​ — Interest expense ​ 2 ​ 22 ​ — ​ 90 ​ 9,197 ​ 9,311 Amortization expense ​ 1,482 ​ 4,159 ​ 2,152 ​ 877 ​ 46 ​ 8,716 Depreciation expense ​ 11,675 ​ 15,163 ​ 12,123 ​ 1,619 ​ 23,384 ​ 63,964 Segment earnings before income taxes ​ 155,364 ​ 83,430 ​ 69,092 ​ 38,333 ​ (5,236) ​ 340,983 Segment assets ​ 510,464 ​ ​ 416,487 ​ ​ 510,972 ​ ​ 196,856 ​ ​ 770,112 ​ 2,404,891 Capital expenditures ​ 16,277 ​ ​ 21,141 ​ ​ 16,902 ​ ​ 2,258 ​ ​ 32,604 ​ 89,182 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ All ​ ​ ​ ​ ​ ​ ​ Retail Industrial Construction Other Corporate Total Net sales to outside customers ​ $ 1,498,710 ​ $ 1,085,635 ​ $ 1,637,156 ​ $ 193,785 ​ $ 723 ​ $ 4,416,009 Intersegment net sales ​ 135,705 ​ 45,010 ​ 56,116 ​ 200,426 ​ (437,257) ​ — Interest expense ​ — ​ 108 ​ 16 ​ 97 ​ 8,479 ​ 8,700 Amortization expense ​ 1,380 ​ 3,034 ​ 1,164 ​ 747 ​ — ​ 6,325 Depreciation expense ​ 11,041 ​ 14,340 ​ 11,465 ​ 1,532 ​ 22,116 ​ 60,494 Segment earnings before income taxes ​ 61,708 ​ 82,913 ​ 82,407 ​ 22,025 ​ (8,379) ​ 240,674 Segment assets ​ 402,221 ​ 377,329 ​ 522,638 ​ 136,990 ​ 450,299 ​ 1,889,477 Capital expenditures ​ 15,502 ​ 20,134 ​ 16,097 ​ 2,150 ​ 31,050 ​ 84,933
Information Regarding Principal Geographic Areas	Information regarding principal geographic areas was as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 ​ 2020 ​ 2019 ​ ​ ​ ​ ​ Long-Lived ​ ​ ​ ​ Long-Lived ​ ​ ​ ​ Long-Lived ​ ​ ​ ​ ​ Tangible ​ ​ ​ ​ Tangible ​ ​ ​ ​ Tangible ​ Net Sales Assets Net Sales Assets Net Sales Assets United States ​ $ 8,395,737 ​ $ 679,757 ​ $ 5,022,014 ​ $ 478,325 ​ $ 4,308,618 ​ $ 469,605 Foreign ​ 240,397 ​ ​ 54,873 ​ ​ 131,984 ​ ​ 36,380 ​ ​ 107,391 ​ ​ 36,878 Total ​ $ 8,636,134 ​ $ 734,630 ​ $ 5,153,998 ​ $ 514,705 ​ $ 4,416,009 ​ $ 506,483
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 and our percentage of value-added and commodity-based sales to total net sales by segment. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended ​ ​ December 25, ​ December 26, ​ December 28, ​ 2021 2020 2019 Retail ​ ​ ​ ​ ​ ​ ​ ​ ​ Deckorators ​ $ 248,765 ​ $ 219,930 ​ $ 185,221 Prowood ​ 1,349,901 ​ 1,215,201 ​ 786,720 Outdoor Essentials ​ 392,826 ​ 299,684 ​ 227,767 Sunbelt ​ ​ 773,909 ​ ​ — ​ ​ — UFP Edge ​ 148,927 ​ 114,987 ​ 95,608 Handprint ​ 101,090 ​ 88,351 ​ 52,553 Retail Building Materials ​ 395,894 ​ 225,253 ​ 149,153 Other ​ 7,025 ​ 3,716 ​ 1,688 Total Retail ​ $ 3,418,337 ​ $ 2,167,122 ​ $ 1,498,710 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Industrial ​ ​ ​ ​ ​ ​ ​ ​ ​ North Industrial ​ $ 615,092 ​ $ 385,132 ​ $ 376,515 Southeast Industrial ​ ​ 395,069 ​ ​ 229,316 ​ ​ 255,419 Southwest Industrial ​ ​ 400,515 ​ ​ 238,643 ​ ​ 241,774 West Industrial ​ ​ 363,300 ​ ​ 206,022 ​ ​ 197,686 PalletOne ​ ​ 355,347 ​ ​ — ​ ​ — Protective Packaging ​ ​ 18,819 ​ ​ 13,004 ​ ​ 14,241 Total Industrial ​ $ 2,148,142 ​ $ 1,072,117 ​ $ 1,085,635 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ ​ ​ ​ ​ ​ ​ ​ ​ Factory Built ​ $ 1,098,905 ​ $ 597,017 ​ $ 479,927 Site Built ​ 1,190,393 ​ 725,899 ​ 708,767 Commercial ​ ​ 259,360 ​ ​ 221,988 ​ ​ 290,785 Concrete Forming ​ 149,776 ​ 150,780 ​ 157,677 Total Construction ​ $ 2,698,434 ​ $ 1,695,684 ​ $ 1,637,156 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ All Other ​ $ 362,473 ​ $ 217,094 ​ $ 193,785 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Corporate ​ $ 8,748 ​ $ 1,981 ​ $ 723 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total Net Sales ​ $ 8,636,134 ​ $ 5,153,998 ​ $ 4,416,009 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Value-Added ​ ​ ​ ​ ​ ​ ​ ​ ​ Retail ​ ​ 43.2% ​ ​ 53.8% ​ ​ 57.8% Industrial ​ ​ 67.7% ​ ​ 64.7% ​ ​ 66.2% Construction ​ ​ 73.0% ​ ​ 76.3% ​ ​ 81.4% All Other and Corporate ​ ​ 74.9% ​ ​ 75.6% ​ ​ 75.8% Total ​ ​ 59.7% ​ ​ 64.3% ​ ​ 69.3% ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commodity-Based ​ ​ ​ ​ ​ ​ ​ ​ ​ Retail ​ ​ 56.8% ​ ​ 46.2% ​ ​ 42.2% Industrial ​ ​ 32.3% ​ ​ 35.3% ​ ​ 33.8% Construction ​ ​ 27.0% ​ ​ 23.7% ​ ​ 18.6% All Other and Corporate ​ ​ 25.1% ​ ​ 24.4% ​ ​ 24.2% Total ​ ​ 40.3% ​ ​ 35.7% ​ ​ 30.7%

QUARTERLY FINANCIAL INFORMATI_2

QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Tables)	12 Months Ended
	Dec. 25, 2021
Quarterly Financial Information	The following table sets forth selected financial information for all of the quarters, consisting of 13 weeks during the years ended December 25, 2021 and December 26, 2020, respectively, (in thousands, except per share data): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ First ​ Second ​ Third ​ Fourth ​ 2021 2020 2021 2020 2021 2020 2021 2020 Net sales ​ $ 1,825,004 ​ $ 1,032,062 ​ $ 2,700,541 ​ $ 1,242,001 ​ $ 2,093,784 ​ $ 1,486,227 ​ $ 2,016,805 ​ $ 1,393,708 Gross profit ​ 286,554 ​ 167,236 ​ 421,294 ​ 204,931 ​ 327,555 ​ 241,074 ​ 371,564 ​ 187,055 Net earnings ​ 104,251 ​ 40,570 ​ 175,360 ​ 69,694 ​ 125,747 ​ 78,861 ​ 147,006 ​ 64,757 Net earnings attributable to controlling interest ​ 103,311 ​ 40,159 ​ 173,382 ​ 66,463 ​ 121,041 ​ 77,204 ​ 137,906 ​ 62,952 Basic earnings per share ​ 1.67 ​ 0.65 ​ 2.79 ​ 1.08 ​ 1.94 ​ 1.25 ​ 2.21 ​ 1.02 Diluted earnings per share ​ 1.67 ​ 0.65 ​ 2.78 ​ 1.08 ​ 1.94 ​ 1.25 ​ 2.21 ​ 1.02

SUMMARY OF SIGNIFICANT ACCOUN_4

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 26, 2020USD ($)	Dec. 25, 2021USD ($)itemcontractcustomer	Dec. 26, 2020USD ($)	Dec. 28, 2019
Summary of significant accounting policies
Number of markets | item		3
Requisite ownership to consolidate (in hundredths) (or more)		50.00%
Length of fiscal year		364 days	364 days	364 days
Restricted investments		$ 19,300
Accounts receivable retainage	$ 8,700	$ 7,800	$ 8,700
Accounts receivable retainage, collection period		18 months
Inventory on consignment	20,800	$ 37,800	20,800
Number of insurance contracts with third party by Ardellis | contract		43
Reserve associated with contracts to third party by Ardellis	4,500	$ 7,100	4,500
Goodwill
Goodwill impairment			11,485
New accounting pronouncement
Retained earnings	1,182,680	1,678,121	1,182,680
Right-of-use assets	77,245	96,703	77,245
Operating lease liability		$ 99,787
Construction | Commercial
Goodwill
Goodwill impairment	11,500
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	$ 97,900	$ 87,600	$ 97,900
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 - Schedule of Accounts Receivable Allowances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Allowance for Doubtful Accounts Receivable [Roll Forward]
Beginning Balance	$ 4,629	$ 4,440	$ 2,601
Additions Charged to Costs and Expenses	66,883	48,954	39,481
Deductions	(66,427)	(48,765)	(37,642)
Ending Balance	$ 5,085	$ 4,629	$ 4,440

SUMMARY OF SIGNIFICANT ACCOUN_6

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Estimated Useful Lives of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020
Property, Plant and Equipment
Property, plant and equipment	$ 1,212,113	$ 974,497
Accumulated amortization	$ 623,093	557,335
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	$ 6,000	5,500
Accumulated amortization	$ 5,300	$ 4,900

SUMMARY OF SIGNIFICANT ACCOUN_7

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 25, 2021USD ($)	Sep. 25, 2021USD ($)	Jun. 26, 2021USD ($)	Mar. 27, 2021USD ($)	Dec. 26, 2020USD ($)	Sep. 26, 2020USD ($)	Jun. 27, 2020USD ($)	Mar. 28, 2020USD ($)	Dec. 25, 2021USD ($)segment	Dec. 26, 2020USD ($)	Dec. 28, 2019USD ($)
Revenue Recognition.
Retained earnings	$ 1,678,121				$ 1,182,680				$ 1,678,121	$ 1,182,680
Number of primary segments the Company operates | segment									3
Net sales	$ 2,016,805	$ 2,093,784	$ 2,700,541	$ 1,825,004	$ 1,393,708	$ 1,486,227	$ 1,242,001	$ 1,032,062	$ 8,636,134	$ 5,153,998	$ 4,416,009
Change % in net sales									67.60%	16.70%
FOB Shipping Point Revenue
Revenue Recognition.
Net sales									$ 8,512,012	$ 5,025,895	4,272,583
Change % in net sales									69.40%	17.60%
Construction Contract Revenue
Revenue Recognition.
Net sales									$ 124,122	$ 128,103	$ 143,426
Change % in net sales									(3.10%)	(10.70%)
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 ACCOUN_8

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Percentage of Completion Account Balances (Details) - USD ($) $ in Thousands	Dec. 25, 2021	Dec. 26, 2020
Cost and Earnings in Excess of Billings	$ 5,602	$ 4,169
Billings in Excess of Cost and Earnings	$ 10,744	$ 11,530

SUMMARY OF SIGNIFICANT ACCOUN_9

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. 25, 2021	Sep. 25, 2021	Jun. 26, 2021	Mar. 27, 2021	Dec. 26, 2020	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Numerator:
Net earnings attributable to controlling interest	$ 137,906	$ 121,041	$ 173,382	$ 103,311	$ 62,952	$ 77,204	$ 66,463	$ 40,159	$ 535,640	$ 246,778	$ 179,650
Adjustment for earnings allocated to non-vested restricted common stock									(17,342)	(6,903)	(4,496)
Net earnings for calculating EPS									$ 518,298	$ 239,875	$ 175,154
Denominator:
Weighted average shares outstanding (in shares)									62,209	61,632	61,649
Adjustment for non-vested restricted common stock (in shares)									(2,014)	(1,724)	(1,543)
Shares for calculating basic EPS (in shares)									60,195	59,908	60,106
Effect of dilutive restricted common stock (in shares)									159	20	24
Shares for calculating diluted EPS (in shares)									60,354	59,928	60,130
Net earnings per share
Basic (USD per share)	$ 2.21	$ 1.94	$ 2.79	$ 1.67	$ 1.02	$ 1.25	$ 1.08	$ 0.65	$ 8.61	$ 4	$ 2.91
Diluted (USD per share)	$ 2.21	$ 1.94	$ 2.78	$ 1.67	$ 1.02	$ 1.25	$ 1.08	$ 0.65	$ 8.59	$ 4	$ 2.91

FAIR VALUE - Asset Measured at

FAIR VALUE - Asset Measured at Fair Value (Details) - USD ($) $ in Thousands	Dec. 25, 2021	Dec. 26, 2020
Money market funds | Cash and Cash Equivalents
Fair Value
Investments at fair value	$ 9,000
Money market funds | Restricted Investment
Fair Value
Investments at fair value	400
Fixed Income | Restricted Investment
Fair Value
Investments at fair value	18,900
Mutual funds, equity and alternative investments | Investments
Fair Value
Investments at fair value	36,500
Money market and mutual funds | Other Non current Assets
Fair Value
Investments at fair value	700
Ardellis Insurance Ltd.
Fair Value
Total Fair Value	55,415	$ 40,777
Estimate of Fair Value Measurement | Recurring
Fair Value
Investments at fair value	65,528	46,045
Assets at fair value	65,528	46,045
Estimate of Fair Value Measurement | Recurring | Money market funds
Fair Value
Investments at fair value	9,411	4,662
Estimate of Fair Value Measurement | Recurring | Fixed Income
Fair Value
Investments at fair value	18,578	16,470
Estimate of Fair Value Measurement | Recurring | Treasury securities
Fair Value
Investments at fair value	342
Estimate of Fair Value Measurement | Recurring | Equity
Fair Value
Investments at fair value	20,163	12,602
Estimate of Fair Value Measurement | Recurring | Alternative Investments
Fair Value
Investments at fair value	3,785	2,040
Estimate of Fair Value Measurement | Recurring | Mutual Fund
Fair Value
Investments at fair value	13,249	10,271
Estimate of Fair Value Measurement | Recurring | Domestic stock
Fair Value
Investments at fair value	10,910	8,088
Estimate of Fair Value Measurement | Recurring | International stock funds
Fair Value
Investments at fair value	1,687	1,440
Estimate of Fair Value Measurement | Recurring | Target funds
Fair Value
Investments at fair value	23	114
Estimate of Fair Value Measurement | Recurring | Bond funds
Fair Value
Investments at fair value	146	147
Estimate of Fair Value Measurement | Recurring | Alternative funds
Fair Value
Investments at fair value	483	482
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1)
Fair Value
Investments at fair value	35,441	23,138
Assets at fair value	35,441	23,138
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Money market funds
Fair Value
Investments at fair value	19	19
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Fixed Income
Fair Value
Investments at fair value	1,668	246
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Treasury securities
Fair Value
Investments at fair value	342
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Equity
Fair Value
Investments at fair value	20,163	12,602
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Mutual Fund
Fair Value
Investments at fair value	13,249	10,271
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Domestic stock
Fair Value
Investments at fair value	10,910	8,088
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | International stock funds
Fair Value
Investments at fair value	1,687	1,440
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Target funds
Fair Value
Investments at fair value	23	114
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Bond funds
Fair Value
Investments at fair value	146	147
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Alternative funds
Fair Value
Investments at fair value	483	482
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2)
Fair Value
Investments at fair value	26,302	20,867
Assets at fair value	26,302	20,867
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Money market funds
Fair Value
Investments at fair value	9,392	4,643
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Fixed Income
Fair Value
Investments at fair value	16,910	16,224
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3)
Fair Value
Investments at fair value	3,785	2,040
Assets at fair value	3,785	2,040
Estimate of Fair Value Measurement | Recurring | Prices with Unobservable Inputs (Level 3) | Alternative Investments
Fair Value
Investments at fair value	$ 3,785	$ 2,040

FAIR VALUE - Available for Sale

FAIR VALUE - Available for Sale Investment Portfolio (Details) - Ardellis Insurance Ltd. - USD ($) $ in Thousands	Dec. 25, 2021	Dec. 26, 2020
Available-for-sale securities
Total Securities Cost	$ 45,932	$ 35,251
Unrealized Gain (Loss)	9,483	5,526
Total Fair Value	55,415	40,777
Fixed Income
Available-for-sale securities
Debt Securities Cost	18,169	15,325
Debt Securities Unrealized Gain/(Loss)	409	1,145
Debt Securities Fair Value	18,578	16,470
Treasury securities
Available-for-sale securities
Debt Securities Cost	342
Debt Securities Fair Value	342
Equity
Available-for-sale securities
Equity Securities Cost	15,196	9,787
Equity Securities Unrealized Gain/(Loss)	4,967	2,815
Equity Securities Fair Value	20,163	12,602
Mutual Fund
Available-for-sale securities
Debt Securities Cost	9,222	8,235
Debt Securities Unrealized Gain/(Loss)	3,325	1,430
Debt Securities Fair Value	12,547	9,665
Alternative Investments
Available-for-sale securities
Debt Securities Cost	3,003	1,904
Debt Securities Unrealized Gain/(Loss)	782	136
Debt Securities Fair Value	$ 3,785	$ 2,040

BUSINESS COMBINATIONS (Details)

BUSINESS COMBINATIONS (Details) $ in Thousands, $ in Millions

Dec. 20, 2021USD ($)

Nov. 22, 2021USD ($)location

Nov. 01, 2021USD ($)

Nov. 01, 2021AUD ($)

Sep. 27, 2021USD ($)ft²

Apr. 29, 2021USD ($)

Apr. 19, 2021USD ($)

Apr. 12, 2021USD ($)employeestate

Mar. 01, 2021USD ($)

Mar. 01, 2021AUD ($)

Dec. 28, 2020USD ($)facility

Nov. 10, 2020USD ($)

Oct. 01, 2020USD ($)

Sep. 30, 2020USD ($)location

Jul. 14, 2020USD ($)

Mar. 13, 2020USD ($)

Dec. 25, 2021USD ($)

Business Acquisition

Aggregate acquisitions' net sales

$ 1,200

Aggregate acquisitions' operating profit

$ 50,500

Advantage | Industrial

Business Acquisition

Purchase Price

$ 20,854

Percentage of stock purchase (as a percent)

100.00%

Intangible Assets

$ 11,481

Net Tangible Assets

9,373

Acquired entity, trailing 12-months sales

$ 19,800

Ficus | All Other

Business Acquisition

Purchase Price

$ 11,155

Percentage of stock purchase (as a percent)

70.00%

Number of plant locations | location

10

Intangible Assets

$ 9,106

Net Tangible Assets

2,049

Acquired entity, trailing 12-months sales

$ 39,000

Boxpack Packaging | All Other

Business Acquisition

Purchase Price

$ 5,984

Percentage of assets purchased (as a percent)

100.00%

Intangible Assets

$ 5,681

Net Tangible Assets

$ 303

Acquired entity, trailing 12-months sales

$ 8.2

Shelter Products | Construction

Business Acquisition

Purchase Price

$ 6,443

Percentage of assets purchased (as a percent)

100.00%

Intangible Assets

$ 4,039

Net Tangible Assets

2,404

Acquired entity, prior year sales

$ 11,400

Square feet of warehouse | ft²

87,800

Endurable Building Products | Construction

Business Acquisition

Purchase Price

$ 10,129

Percentage of assets purchased (as a percent)

100.00%

Intangible Assets

$ 7,099

Net Tangible Assets

3,030

Acquired entity, prior year sales

$ 15,000

Walnut Hollow Farm, Inc. | Retail

Business Acquisition

Purchase Price

$ 8,549

Percentage of assets purchased (as a percent)

100.00%

Intangible Assets

$ 1,526

Net Tangible Assets

7,023

Acquired entity, prior year sales

$ 11,600

Spartanburg Forest Products, Inc. | Retail

Business Acquisition

Purchase Price

$ 153,462

Percentage of assets purchased (as a percent)

100.00%

Net Tangible Assets

$ 153,462

Acquired entity, prior year sales

$ 543,000

Number of Employees | employee

150

Number of states in which the entity operates | state

5

J. C. Gilmore Pty Ltd | All Other

Business Acquisition

Purchase Price

$ 4,724

Percentage of assets purchased (as a percent)

100.00%

Intangible Assets

$ 4,264

Net Tangible Assets

460

Acquired entity, prior year sales

$ 10,000

$ 15

PalletOne | Industrial

Business Acquisition

Purchase Price

$ 259,011

Percentage of stock purchase (as a percent)

100.00%

Intangible Assets

$ 79,917

Net Tangible Assets

179,094

Acquired entity, trailing 12-months sales

$ 698,000

Number of pallet manufacturing facilities | facility

17

Number of pressure-treating facilities | facility

5

Atlantic Prefab, Inc., Exterior Designs, LLC and Patriot Building Systems, LLC | Construction

Business Acquisition

Purchase Price

$ 21,268

Percentage of assets purchased (as a percent)

100.00%

Intangible Assets

$ 11,923

Net Tangible Assets

9,345

Acquired entity, prior year sales

$ 28,000

FRCT | Retail

Business Acquisition

Purchase Price

$ 5,936

Percentage of assets purchased (as a percent)

100.00%

Intangible Assets

$ 5,222

Net Tangible Assets

714

Acquired entity, prior year sales

$ 6,400

Enwrap | All Other

Business Acquisition

Purchase Price

$ 3,475

Percentage of assets purchased (as a percent)

50.00%

Number of plant locations | location

8

Intangible Assets

$ 7,267

Net Tangible Assets

(1,369)

Acquired entity, prior year sales

$ 14,000

T&R Lumber Company | Industrial

Business Acquisition

Purchase Price

$ 18,496

Percentage of assets purchased (as a percent)

100.00%

Intangible Assets

$ 12,458

Net Tangible Assets

6,038

Acquired entity, prior year sales

$ 31,000

Quest Design | Construction

Business Acquisition

Purchase Price

$ 22,951

Percentage of assets purchased (as a percent)

100.00%

Intangible Assets

$ 20,262

Net Tangible Assets

2,689

Acquired entity, prior year sales

$ 22,000

BUSINESS COMBINATIONS - Acquire

BUSINESS COMBINATIONS - Acquired Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Business Acquisition
GOODWILL	$ 315,038	$ 252,193	$ 229,536
Advantage
Business Acquisition
GOODWILL	11,481
Goodwill - Tax Deductible	11,481
Ficus
Business Acquisition
GOODWILL	8,889
Goodwill - Tax Deductible	8,889
Boxpack Packaging
Business Acquisition
GOODWILL	1,978
Goodwill - Tax Deductible	4,672
Shelter Products
Business Acquisition
GOODWILL	2,020
Goodwill - Tax Deductible	4,039
Endurable Building Products
Business Acquisition
GOODWILL	2,482
Goodwill - Tax Deductible	7,099
Walnut Hollow Farm, Inc.
Business Acquisition
GOODWILL	263
Goodwill - Tax Deductible	1,526
J. C. Gilmore Pty Ltd
Business Acquisition
GOODWILL	1,938
Goodwill - Tax Deductible	3,876
PalletOne
Business Acquisition
GOODWILL	44,378
Goodwill - Tax Deductible	79,917
Atlantic Prefab
Business Acquisition
GOODWILL	1,356
Goodwill - Tax Deductible	3,543
Exterior Designs
Business Acquisition
GOODWILL	2,241
Goodwill - Tax Deductible	5,740
Patriot Building Systems
Business Acquisition
GOODWILL	1,036
Goodwill - Tax Deductible	2,640
FRCT
Business Acquisition
GOODWILL	1,962
Goodwill - Tax Deductible	5,222
Enwrap
Business Acquisition
GOODWILL	3,705
Goodwill - Tax Deductible	6,820
T&R Lumber Company
Business Acquisition
GOODWILL	4,258
Goodwill - Tax Deductible	12,458
Quest Design
Business Acquisition
GOODWILL	8,041
Goodwill - Tax Deductible	20,262
Non-compete agreements | Atlantic Prefab
Business Acquisition
Intangible assets other than goodwill	417
Non-compete agreements | Exterior Designs
Business Acquisition
Intangible assets other than goodwill	667
Non-compete agreements | Patriot Building Systems
Business Acquisition
Intangible assets other than goodwill	306
Non-compete agreements | FRCT
Business Acquisition
Intangible assets other than goodwill	1,090
Non-compete agreements | Enwrap
Business Acquisition
Intangible assets other than goodwill	790
Non-compete agreements | T&R Lumber Company
Business Acquisition
Intangible assets other than goodwill	600
Patents | Enwrap
Business Acquisition
Intangible assets other than goodwill	1,293
Customer relationships | Boxpack Packaging
Business Acquisition
Intangible assets other than goodwill	2,694
Customer relationships | Shelter Products
Business Acquisition
Intangible assets other than goodwill	2,019
Customer relationships | Endurable Building Products
Business Acquisition
Intangible assets other than goodwill	4,617
Customer relationships | Walnut Hollow Farm, Inc.
Business Acquisition
Intangible assets other than goodwill	1,263
Customer relationships | J. C. Gilmore Pty Ltd
Business Acquisition
Intangible assets other than goodwill	1,938
Customer relationships | PalletOne
Business Acquisition
Intangible assets other than goodwill	18,089
Customer relationships | Atlantic Prefab
Business Acquisition
Intangible assets other than goodwill	1,620
Customer relationships | Exterior Designs
Business Acquisition
Intangible assets other than goodwill	2,592
Customer relationships | Patriot Building Systems
Business Acquisition
Intangible assets other than goodwill	1,188
Customer relationships | FRCT
Business Acquisition
Intangible assets other than goodwill	1,960
Customer relationships | Enwrap
Business Acquisition
Intangible assets other than goodwill	558
Customer relationships | T&R Lumber Company
Business Acquisition
Intangible assets other than goodwill	5,000
Customer relationships | Quest Design
Business Acquisition
Intangible assets other than goodwill	10,318
Tradename | PalletOne
Business Acquisition
Intangible assets other than goodwill	17,450
Tradename | Atlantic Prefab
Business Acquisition
Intangible assets other than goodwill	150
Tradename | Exterior Designs
Business Acquisition
Intangible assets other than goodwill	240
Tradename | Patriot Building Systems
Business Acquisition
Intangible assets other than goodwill	110
Tradename | FRCT
Business Acquisition
Intangible assets other than goodwill	210
Tradename | Enwrap
Business Acquisition
Intangible assets other than goodwill	474
Tradename | T&R Lumber Company
Business Acquisition
Intangible assets other than goodwill	2,600
Tradename | Quest Design
Business Acquisition
Intangible assets other than goodwill	$ 1,903

GOODWILL AND OTHER INTANGIBLE_3

GOODWILL AND OTHER INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Goodwill impairment		$ 11,485
Indefinite-lived intangible assets	$ 7,369	7,401
Amortization of intangibles	$ 13,948	$ 8,716	$ 6,325

GOODWILL AND OTHER INTANGIBLE_4

GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill by Reporting Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020
Goodwill
Goodwill, Beginning Balance	$ 252,193	$ 229,536
Acquisitions	74,503	33,535
Purchase Accounting Adjustments	(10,680)	204
Impairments		(11,485)
Foreign Exchange, Net	(978)	403
Goodwill, Ending Balance	315,038	252,193
Retail
Goodwill
Goodwill, Beginning Balance	61,943	58,098
Acquisitions	13,115	3,643
Purchase Accounting Adjustments	(1,682)	202
Goodwill, Ending Balance	73,376	61,943
Industrial
Goodwill
Goodwill, Beginning Balance	87,827	81,276
Acquisitions	43,006	6,549
Purchase Accounting Adjustments	(2,292)	2
Goodwill, Ending Balance	128,541	87,827
Construction
Goodwill
Goodwill, Beginning Balance	90,729	82,911
Acquisitions	4,502	18,902
Purchase Accounting Adjustments	(6,228)
Impairments		(11,485)
Foreign Exchange, Net	(3)	401
Goodwill, Ending Balance	89,000	90,729
Construction | Commercial
Goodwill
Impairments		(11,500)
All Other
Goodwill
Goodwill, Beginning Balance	11,694	7,251
Acquisitions	13,880	4,441
Purchase Accounting Adjustments	(478)
Foreign Exchange, Net	(975)	2
Goodwill, Ending Balance	$ 24,121	$ 11,694

GOODWILL AND OTHER INTANGIBLE_5

GOODWILL AND OTHER INTANGIBLE ASSETS - Included in Other Amortizable Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 25, 2021	Dec. 26, 2020
Finite-Lived Intangible Assets
Assets	$ 148,809	$ 99,268
Accumulated Amortization	(39,792)	(27,016)
Net Value	109,017	72,252
Non-compete agreements
Finite-Lived Intangible Assets
Assets	8,490	4,847
Accumulated Amortization	(4,160)	(2,728)
Net Value	4,330	2,119
Customer relationships
Finite-Lived Intangible Assets
Assets	101,158	80,343
Accumulated Amortization	(25,012)	(17,021)
Net Value	76,146	63,322
Licensing agreements
Finite-Lived Intangible Assets
Assets	4,589	4,589
Accumulated Amortization	(4,589)	(4,589)
Patents
Finite-Lived Intangible Assets
Assets	3,221	965
Accumulated Amortization	(1,137)	(509)
Net Value	2,084	456
Tradename
Finite-Lived Intangible Assets
Assets	30,392	8,019
Accumulated Amortization	(4,599)	(2,123)
Net Value	25,793	5,896
Software
Finite-Lived Intangible Assets
Assets	959	505
Accumulated Amortization	(295)	(46)
Net Value	$ 664	$ 459

GOODWILL AND OTHER INTANGIBLE_6

GOODWILL AND OTHER INTANGIBLE ASSETS - Estimated Useful Lives of Intangible Assets (Details)	12 Months Ended
	Dec. 25, 2021
Non-compete agreements
Acquired Finite-Lived Intangible Assets
Weighted average amortization period	7 years 9 months 18 days
Customer relationships
Acquired Finite-Lived Intangible Assets
Weighted average amortization period	9 years 8 months 12 days
Licensing agreements
Acquired Finite-Lived Intangible Assets
Estimated useful life	10 years
Weighted average amortization period	10 years
Patents
Acquired Finite-Lived Intangible Assets
Estimated useful life	10 years
Weighted average amortization period	10 years
Tradename
Acquired Finite-Lived Intangible Assets
Weighted average amortization period	11 years
Software
Acquired Finite-Lived Intangible Assets
Weighted average amortization period	3 years 6 months
Minimum | Non-compete agreements
Acquired Finite-Lived Intangible Assets
Estimated useful life	3 years
Minimum | Customer relationships
Acquired Finite-Lived Intangible Assets
Estimated useful life	5 years
Minimum | Tradename
Acquired Finite-Lived Intangible Assets
Estimated useful life	5 years
Minimum | Software
Acquired Finite-Lived Intangible Assets
Estimated useful life	3 years
Maximum | Non-compete agreements
Acquired Finite-Lived Intangible Assets
Estimated useful life	15 years
Maximum | Customer relationships
Acquired Finite-Lived Intangible Assets
Estimated useful life	15 years
Maximum | Tradename
Acquired Finite-Lived Intangible Assets
Estimated useful life	15 years
Maximum | Software
Acquired Finite-Lived Intangible Assets
Estimated useful life	5 years

GOODWILL AND OTHER INTANGIBLE_7

GOODWILL AND OTHER INTANGIBLE ASSETS - Estimated Amortization Expense for Intangibles (Details) - USD ($) $ in Thousands	Dec. 25, 2021	Dec. 26, 2020
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity
2022	$ 13,734
2023	12,878
2024	12,409
2025	11,901
2026	10,944
Thereafter	47,151
Net Value	$ 109,017	$ 72,252

DEBT - Narrative (Details)

DEBT - Narrative (Details) - USD ($) $ in Millions	Nov. 01, 2018	Dec. 25, 2021	Feb. 28, 2021	Feb. 27, 2021	Dec. 26, 2020	Aug. 10, 2020
Debt
Outstanding letters of credit		$ 54.2			$ 41
Fair value of long-term debt including current portion		334.6
Difference between fair value and carrying value of debt		14.3
Revolving Credit Facility
Debt
Term of debt	5 years
Maximum borrowing capacity	$ 375		$ 550	$ 375
Outstanding letters of credit	40
Outstanding letters of credit that can be converted to foreign currency	$ 100
Remaining borrowing capacity		$ 535.1			$ 363.2
Revolving Credit Facility | Minimum
Debt
Facility fee (in hundredths)	0.125%
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%
Debt						$ 50
Series 2020 F Senior Notes | Senior Notes
Debt
Interest rate (in hundredths)		3.08%				3.08%
Debt						$ 50
Series 2020 G Senior Notes | Senior Notes
Debt
Interest rate (in hundredths)		3.15%				3.15%
Debt						$ 50
Series 2012 Senior Notes Tranche A | Senior Notes
Debt
Interest rate (in hundredths)		3.89%			3.89%
Series 2012 Senior Notes Tranche B | Senior Notes
Debt
Interest rate (in hundredths)		3.98%			3.98%
Letter of Credit
Debt
Interest rate (in hundredths)		1.125%
Term of debt		1 year
Letter of Credit | Industrial Development Revenue Bonds
Debt
Outstanding letters of credit		$ 7.1

DEBT - Long-term Debt Obligatio

DEBT - Long-term Debt Obligations (Details) - USD ($) $ in Thousands	Dec. 25, 2021	Feb. 28, 2021	Feb. 27, 2021	Dec. 26, 2020	Aug. 10, 2020	Nov. 01, 2018
Debt
Total	$ 320,362			$ 311,853
Less current portion	(42,683)			(100)
Less debt issuance costs	(112)			(146)
Long-term portion	277,567			311,607
Finance Leases and Foreign Affiliate Debt
Debt
Total	5,544			138
Senior Notes | Series 2020 E Senior Notes
Debt
Total	$ 50,000			50,000
Interest rate (in hundredths)	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%
Senior Notes | Series 2020 G Senior Notes
Debt
Total	$ 50,000			50,000
Interest rate (in hundredths)	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 A
Debt
Total	$ 35,000			$ 35,000
Interest rate (in hundredths)	3.89%			3.89%
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		$ 550,000	$ 375,000			$ 375,000
Revolving Credit Facility | Domestic and Foreign Borrowings
Debt
Total	$ 7,800			$ 4,700
Revolving Credit Facility | Foreign Affiliate Debt
Debt
Total	$ 7,818			$ 4,715
Interest rate at period end (in hundredths)	1.06%			1.125%
Corporate Debt Securities | Series 1999 Industrial Development Revenue Bonds
Debt
Total	$ 3,300			$ 3,300
Interest rate at period end (in hundredths)	0.14%			0.20%
Corporate Debt Securities | Series 2002 Industrial Development Revenue Bonds
Debt
Total	$ 3,700			$ 3,700
Interest rate at period end (in hundredths)	0.18%			0.22%

DEBT - Principal Maturities of

DEBT - Principal Maturities of Long-Term Debt and Capital Lease Obligations (Details) $ in Thousands	Dec. 25, 2021USD ($)
Principal Maturities
2022	$ 42,683
2023	8,863
2024	40,214
2026	302
Thereafter	228,300
Total	$ 320,362

LEASES (Details)

LEASES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Leases
Retained earnings	$ 1,678,121	$ 1,182,680
Right-of-use assets	96,703	77,245
Operating lease liability	$ 99,787
Lessee, Operating Lease, Existence of Option to Extend	true
Rent expense	$ 40,100	$ 28,400	$ 29,900
Operating lease weighted average remaining term	7 years 3 months 29 days	6 years 10 months 2 days
Operating lease weighted average discount rate	2.87%	3.12%
Lease costs
Operating lease cost	$ 30,054	$ 21,594
Short-term lease cost	5,264	2,863
Variable lease cost	4,761	3,985
Sublease Income	3,109	1,013
Total lease cost	36,970	27,429
Cash paid - operation leases	27,400	$ 20,000
Right-of-use assets obtained in exchange for new operating leases	46,700		$ 12,800
Future minimum payments
2022	26,378
2023	21,040
2024	15,842
2025	13,164
2026	11,140
Thereafter	27,123
Total minimum lease payments	114,687
Less present value discount	(14,900)
Total lease liability	$ 99,787
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 Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 25, 2021	Dec. 26, 2020
Deferred compensation
Deferred compensation liability		$ 200	$ 200
Increase in investment in life insurance contracts	$ 15,253
Liabilities related to Plan		42,100	36,600
Other Assets
Deferred compensation
Investment in life insurance contracts		12,700	13,300
Assets held by the Plan		$ 700	$ 600

COMMON STOCK (Details)

COMMON STOCK (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019	Feb. 15, 2022
Common stock
Granted (in shares)	560,516	348,016	318,496
Share-based compensation expense	$ 11.2	$ 4	$ 4
Income tax benefit from share-based compensation	2.7	1	0.8
Cash received from option exercises and share issuances under plans	$ 2.1	$ 1.4	1.1
Stock Repurchase Program [Abstract]
Repurchase of shares (in shares)	0	756,397
Subsequent Event
Stock Repurchase Program [Abstract]
Additional shares authorized for repurchase (in shares)				1,500,000
Cumulative total authorized shares available for repurchase (in shares)				2,600,000
Stock Purchase Plan
Common stock
Discount rate from fair market value on purchase date (in hundredths)	85.00%
Stock Retainer Plan
Common stock
Multiplier of retainer fee (in hundredths)	110.00%
Stock Retainer Plan expense	$ 1.7	$ 1.8	1.8
Stock Options
Common stock
Unrecognized compensation expense of stock options	0	0	$ 0
Bonus Awards
Common stock
Amount of grants	$ 60
Granted (in shares)	751,978
Share-based compensation expense	$ 11.5	$ 4
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
Performance Shares
Common stock
Amount of grants	$ 2.3
Granted (in shares)	28,866
Vesting period (in years)	3 years

COMMON STOCK - Common Stock Iss

COMMON STOCK - Common Stock Issuances (Details) - $ / shares	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020
Common Stock
Forfeitures		(9,000)
Repurchase of common stock	0	756,397
Stock Purchase Plan
Common Stock
Common stock issued	33,000	35,000
Average Share Price
Common stock issued (dollars per share)	$ 75.18	$ 46.71
Stock Gift Program
Common Stock
Common stock issued	2,000	3,000
Average Share Price
Common stock issued (dollars per share)	$ 78.37	$ 48.10
Stock Retainer Plan
Common Stock
Common stock issued	5,000	46,000
Average Share Price
Common stock issued (dollars per share)	$ 72.66	$ 25.31
Bonus Plan
Common Stock
Common stock issued	487,000	271,000
Average Share Price
Common stock issued (dollars per share)	$ 59.56	$ 47.52
Executive Stock Grants Plan
Common Stock
Common stock issued	77,000	79,000
Average Share Price
Common stock issued (dollars per share)	$ 60.24	$ 47.60
Deferred Compensation Plans
Common Stock
Common stock issued	117,000	128,000
Average Share Price
Common stock issued (dollars per share)	$ 64.14	$ 53.79
Stock grant programs
Common Stock
Forfeitures	(24,000)
Common stock issued, net of forfeitures	547,000	390,000
Average Share Price
Common stock issued (dollars per share)	$ 59.84	$ 44.96

COMMON STOCK - Nonvested Restri

COMMON STOCK - Nonvested Restricted Shares Awards (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Restricted Awards
Nonvested, beginning balance (in shares)	1,363,794	1,202,895	1,160,079
Granted (in shares)	560,516	348,016	318,496
Vested (in shares)	(274,271)	(177,790)	(224,894)
Forfeited (in shares)	(23,007)	(9,327)	(50,786)
Nonvested, ending balance (in shares)	1,627,032	1,363,794	1,202,895	1,160,079
Weighted Average Grant Date Fair Value
Nonvested, beginning balance (in dollars per share)	$ 35.14	$ 29.68	$ 23.32
Granted (in dollars per share)	60.24	47.60	32.60
Vested (in dollars per share)	26.50	22.69	23.42
Forfeited (in dollars per share)	39.68	33.46	24.18
Nonvested, ending balance (in dollars per share)	$ 45.23	$ 35.14	$ 29.68	$ 23.32
Unrecognized Compensation Expense
Nonvested restricted awards, unrecognized compensation expense	$ 6.6	$ 6.3	$ 7.9	$ 7.6
Nonvested restricted awards, weighted-average period to recognize expense	5 months 4 days	7 months 13 days	10 months 9 days	1 year 1 month 13 days

RETIREMENT PLANS (Details)

RETIREMENT PLANS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution, percent (in hundredths)	25.00%	25.00%	25.00%
Defined contribution plan, cost recognized	$ 9.2	$ 7.2	$ 6.5
Additional matching contributions	$ 3.7	2.9	$ 2.6
Maximum annual contribution per employee (in hundredths)	6.00%
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	$ 13.1	$ 11.8

INCOME TAXES - Components of In

INCOME TAXES - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Currently Payable:
Federal	$ 115,077	$ 59,055	$ 35,267
State and local	30,441	16,709	10,071
Foreign	21,095	8,601	5,834
Total current payable	166,613	84,365	51,172
Net Deferred:
Federal	6,242	2,292	6,895
State and local	118	(1,518)	805
Foreign	999	1,962	(602)
Total net deferred	7,359	2,736	7,098
Income Tax Expense (Benefit), Total	$ 173,972	$ 87,101	$ 58,270

INCOME TAXES - Components of Ea

INCOME TAXES - Components of Earnings before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Components of earnings before income taxes [Abstract]
U.S.	$ 645,316	$ 308,167	$ 220,532
Foreign	81,020	32,816	20,142
Total.	$ 726,336	$ 340,983	$ 240,674

INCOME TAXES - Effective Income

INCOME TAXES - Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Effective income tax rate reconciliation
Statutory federal income tax rate	21.00%	21.00%	21.00%
State and local taxes (net of federal benefits)	3.30%	3.40%	3.90%
Effect of noncontrolling owned interest in earnings of partnerships			(0.10%)
Tax credits, including foreign tax credit	(0.60%)	(0.90%)	(1.30%)
Change in uncertain tax positions reserve	(0.10%)	(0.10%)	(0.10%)
Other permanent differences	(0.40%)	0.60%	0.50%
Other, net	0.70%	1.50%	0.30%
Effective income tax rate	23.90%	25.50%	24.20%

INCOME TAXES - Components of De

INCOME TAXES - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 25, 2021	Dec. 26, 2020
Deferred Tax Assets
Employee benefits	$ 27,543	$ 23,236
Lease liability	24,627	19,376
Net operating loss carryforwards	5,502	6,463
Foreign subsidiary capital loss carryforward	527	527
Other tax credits	450	391
Inventory	2,007	1,633
Reserves on receivables	1,446	1,630
Accrued expenses	5,735	3,071
Other, net	5,233	8,483
Gross deferred income tax assets	73,070	64,810
Valuation allowance	(3,952)	(4,044)
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent, Total	69,118	60,766
Deferred Tax Liabilities
Depreciation	(64,387)	(41,403)
Intangibles	(38,367)	(22,840)
Right of use assets	(23,866)	(19,376)
Deferred income tax liabilities	(126,620)	(83,619)
Net deferred income tax liability	$ (57,502)	$ (22,853)

INCOME TAXES - NOL and Credit C

INCOME TAXES - NOL and Credit Carryforwards (Details) $ in Thousands	Dec. 25, 2021USD ($)
Operating Loss and Credit Carryforwards
Valuation allowance - NOL carryforwards	$ 3,400
Domestic Tax Authority
Operating Loss and Credit Carryforwards
Net Operating Losses	790
Domestic Tax Authority | 2037 - 2041
Operating Loss and Credit Carryforwards
Net Operating Losses	790
State
Operating Loss and Credit Carryforwards
Net Operating Losses	2,352
Tax Credits	450
State | 2027 - 2031
Operating Loss and Credit Carryforwards
Net Operating Losses	436
State | 2036 - 2036
Operating Loss and Credit Carryforwards
Net Operating Losses	670
Tax Credits	450
State | 2037 - 2041
Operating Loss and Credit Carryforwards
Net Operating Losses	808
State | Thereafter
Operating Loss and Credit Carryforwards
Net Operating Losses	438
Foreign Country
Operating Loss and Credit Carryforwards
Net Operating Losses	2,360
Foreign Country | 2022 - 2026
Operating Loss and Credit Carryforwards
Net Operating Losses	536
Foreign Country | 2027 - 2031
Operating Loss and Credit Carryforwards
Net Operating Losses	1,424
Foreign Country | 2036 - 2036
Operating Loss and Credit Carryforwards
Net Operating Losses	106
Foreign Country | Thereafter
Operating Loss and Credit Carryforwards
Net Operating Losses	294
Federal, state and foreign
Operating Loss and Credit Carryforwards
Net Operating Losses	5,500
Capital Loss Carryforward
Operating Loss and Credit Carryforwards
Valuation allowance - NOL carryforwards	500
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. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Reconciliation of beginning and ending amount of unrecognized tax benefits [Roll Forward]
Gross unrecognized tax benefits beginning of year	$ 3,892	$ 4,166	$ 4,378
Increase in tax positions for prior years	437
Decrease in tax positions for prior years		(82)	(129)
Increase in tax positions for current year	839	730	768
Lapse in statute of limitations	(1,565)	(922)	(851)
Gross unrecognized tax benefits end of year	3,603	3,892	4,166
Income tax penalties and interest accrued	500	$ 500	$ 500
Increase in unrecognized tax benefits is reasonably possible	$ 1,100

COMMITMENTS, CONTINGENCIES, A_2

COMMITMENTS, CONTINGENCIES, AND GUARANTEES (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020
Long-term commitment
Outstanding purchase commitments on capital projects	$ 52.7
Surety Bonds and Letters of Credit
Outstanding letters of credit	54.2	$ 41
Open Projects
Surety Bonds and Letters of Credit
Payment and performance bonds outstanding	31.5
Completed Projects
Surety Bonds and Letters of Credit
Payment and performance bonds outstanding	10.7
Insurance Contracts
Surety Bonds and Letters of Credit
Outstanding letters of credit	47.1
Revenue Bonds
Surety Bonds and Letters of Credit
Outstanding letters of credit	$ 7.1

SEGMENT REPORTING - NARRATIVE (

SEGMENT REPORTING - NARRATIVE (Details) - Total Sales - Customer Concentration - customer	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Two Customers
Concentration risk
Number of customers	2	2	2
Home Depot
Concentration risk
Percent of sales	16.00%	24.00%	19.00%
Lowes
Concentration risk
Percent of sales	10.00%	4.00%	4.00%

SEGMENT REPORTING - Information

SEGMENT REPORTING - Information By Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 25, 2021	Sep. 25, 2021	Jun. 26, 2021	Mar. 27, 2021	Dec. 26, 2020	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Segment Reporting
Net sales	$ 2,016,805	$ 2,093,784	$ 2,700,541	$ 1,825,004	$ 1,393,708	$ 1,486,227	$ 1,242,001	$ 1,032,062	$ 8,636,134	$ 5,153,998	$ 4,416,009
Interest expense									13,814	9,311	8,700
Amortization expense									13,948	8,716	6,325
Depreciation									84,184	63,964	60,494
Segment earnings before income taxes									726,336	340,983	240,674
Segment assets	3,245,271				2,404,891				3,245,271	2,404,891	1,889,477
Capital expenditures									151,166	89,182	84,933
Intersegment net sales
Segment Reporting
Net sales									(838,254)	(540,039)	(437,257)
Corporate
Segment Reporting
Net sales									8,748	1,981	723
Interest expense									13,519	9,197	8,479
Amortization expense									214	46
Depreciation									25,765	23,384	22,116
Segment earnings before income taxes									(8,555)	(5,236)	(8,379)
Segment assets	579,890				770,112				579,890	770,112	450,299
Capital expenditures									40,622	32,604	31,050
Retail | Operating Segments
Segment Reporting
Net sales									3,418,337	2,167,122	1,498,710
Interest expense									98	2
Amortization expense									2,780	1,482	1,380
Depreciation									16,955	11,675	11,041
Segment earnings before income taxes									124,790	155,364	61,708
Segment assets	844,189				510,464				844,189	510,464	402,221
Capital expenditures									40,408	16,277	15,502
Retail | Intersegment net sales
Segment Reporting
Net sales									214,400	142,839	135,705
Industrial | Operating Segments
Segment Reporting
Net sales									2,148,142	1,072,117	1,085,635
Interest expense									12	22	108
Amortization expense									6,093	4,159	3,034
Depreciation									26,219	15,163	14,340
Segment earnings before income taxes									264,958	83,430	82,913
Segment assets	741,672				416,487				741,672	416,487	377,329
Capital expenditures									42,652	21,141	20,134
Industrial | Intersegment net sales
Segment Reporting
Net sales									85,954	45,217	45,010
Construction | Operating Segments
Segment Reporting
Net sales									2,698,434	1,695,684	1,637,156
Interest expense									1		16
Amortization expense									3,525	2,152	1,164
Depreciation									13,151	12,123	11,465
Segment earnings before income taxes									264,238	69,092	82,407
Segment assets	736,157				510,972				736,157	510,972	522,638
Capital expenditures									22,344	16,902	16,097
Construction | Intersegment net sales
Segment Reporting
Net sales									82,026	68,294	56,116
All Other | Operating Segments
Segment Reporting
Net sales									362,473	217,094	193,785
Interest expense									184	90	97
Amortization expense									1,336	877	747
Depreciation									2,094	1,619	1,532
Segment earnings before income taxes									80,905	38,333	22,025
Segment assets	$ 343,363				$ 196,856				343,363	196,856	136,990
Capital expenditures									5,140	2,258	2,150
All Other | Intersegment net sales
Segment Reporting
Net sales									$ 455,874	$ 283,689	$ 200,426

SEGMENT REPORTING - Informati_2

SEGMENT REPORTING - Information Regarding Principal Geographic Areas (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 25, 2021	Sep. 25, 2021	Jun. 26, 2021	Mar. 27, 2021	Dec. 26, 2020	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Revenues and Long-Lived Assets
Net sales	$ 2,016,805	$ 2,093,784	$ 2,700,541	$ 1,825,004	$ 1,393,708	$ 1,486,227	$ 1,242,001	$ 1,032,062	$ 8,636,134	$ 5,153,998	$ 4,416,009
Long-Lived Tangible Assets	734,630				514,705				734,630	514,705	506,483
United States
Revenues and Long-Lived Assets
Net sales									8,395,737	5,022,014	4,308,618
Long-Lived Tangible Assets	679,757				478,325				679,757	478,325	469,605
Foreign
Revenues and Long-Lived Assets
Net sales									240,397	131,984	107,391
Long-Lived Tangible Assets	$ 54,873				$ 36,380				$ 54,873	$ 36,380	$ 36,878

SEGMENT REPORTING - Gross Sales

SEGMENT REPORTING - Gross Sales by Major Product Classification (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 25, 2021	Sep. 25, 2021	Jun. 26, 2021	Mar. 27, 2021	Dec. 26, 2020	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Revenue
Net sales	$ 2,016,805	$ 2,093,784	$ 2,700,541	$ 1,825,004	$ 1,393,708	$ 1,486,227	$ 1,242,001	$ 1,032,062	$ 8,636,134	$ 5,153,998	$ 4,416,009
Value-Added
Revenue
Portion of total net sales (as a percent)	59.70%				64.30%				59.70%	64.30%	69.30%
Commodity-Based Sales
Revenue
Portion of total net sales (as a percent)	40.30%				35.70%				40.30%	35.70%	30.70%
Intersegment net sales
Revenue
Net sales									$ (838,254)	$ (540,039)	$ (437,257)
Corporate
Revenue
Net sales									$ 8,748	$ 1,981	$ 723
Retail | Value-Added
Revenue
Portion of total net sales (as a percent)	43.20%				53.80%				43.20%	53.80%	57.80%
Retail | Commodity-Based Sales
Revenue
Portion of total net sales (as a percent)	56.80%				46.20%				56.80%	46.20%	42.20%
Retail | Operating Segments
Revenue
Net sales									$ 3,418,337	$ 2,167,122	$ 1,498,710
Retail | Operating Segments | Deckorators
Revenue
Net sales									248,765	219,930	185,221
Retail | Operating Segments | Prowood
Revenue
Net sales									1,349,901	1,215,201	786,720
Retail | Operating Segments | Outdoor Essentials
Revenue
Net sales									392,826	299,684	227,767
Retail | Operating Segments | Sunbelt
Revenue
Net sales									773,909
Retail | Operating Segments | UFP Edge
Revenue
Net sales									148,927	114,987	95,608
Retail | Operating Segments | Handprint
Revenue
Net sales									101,090	88,351	52,553
Retail | Operating Segments | Retail Building Materials
Revenue
Net sales									395,894	225,253	149,153
Retail | Operating Segments | Other Retail
Revenue
Net sales									7,025	3,716	1,688
Retail | Intersegment net sales
Revenue
Net sales									$ 214,400	$ 142,839	$ 135,705
Industrial | Value-Added
Revenue
Portion of total net sales (as a percent)	67.70%				64.70%				67.70%	64.70%	66.20%
Industrial | Commodity-Based Sales
Revenue
Portion of total net sales (as a percent)	32.30%				35.30%				32.30%	35.30%	33.80%
Industrial | Operating Segments
Revenue
Net sales									$ 2,148,142	$ 1,072,117	$ 1,085,635
Industrial | Operating Segments | North Industrial
Revenue
Net sales									615,092	385,132	376,515
Industrial | Operating Segments | Southeast Industrial
Revenue
Net sales									395,069	229,316	255,419
Industrial | Operating Segments | Southwest Industrial
Revenue
Net sales									400,515	238,643	241,774
Industrial | Operating Segments | West Industrial
Revenue
Net sales									363,300	206,022	197,686
Industrial | Operating Segments | PalletOne
Revenue
Net sales									355,347
Industrial | Operating Segments | Protective Packaging
Revenue
Net sales									18,819	13,004	14,241
Industrial | Intersegment net sales
Revenue
Net sales									$ 85,954	$ 45,217	$ 45,010
Construction | Value-Added
Revenue
Portion of total net sales (as a percent)	73.00%				76.30%				73.00%	76.30%	81.40%
Construction | Commodity-Based Sales
Revenue
Portion of total net sales (as a percent)	27.00%				23.70%				27.00%	23.70%	18.60%
Construction | Operating Segments
Revenue
Net sales									$ 2,698,434	$ 1,695,684	$ 1,637,156
Construction | Operating Segments | Factory Built
Revenue
Net sales									1,098,905	597,017	479,927
Construction | Operating Segments | Site Built
Revenue
Net sales									1,190,393	725,899	708,767
Construction | Operating Segments | Commercial
Revenue
Net sales									259,360	221,988	290,785
Construction | Operating Segments | Concrete Forming
Revenue
Net sales									149,776	150,780	157,677
Construction | Intersegment net sales
Revenue
Net sales									82,026	68,294	56,116
All Other | Operating Segments
Revenue
Net sales									362,473	217,094	193,785
All Other | Intersegment net sales
Revenue
Net sales									$ 455,874	$ 283,689	$ 200,426
All Other and Corporate | Value-Added
Revenue
Portion of total net sales (as a percent)	74.90%				75.60%				74.90%	75.60%	75.80%
All Other and Corporate | Commodity-Based Sales
Revenue
Portion of total net sales (as a percent)	25.10%				24.40%				25.10%	24.40%	24.20%

QUARTERLY FINANCIAL INFORMATI_3

QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 25, 2021	Sep. 25, 2021	Jun. 26, 2021	Mar. 27, 2021	Dec. 26, 2020	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
NET SALES	$ 2,016,805	$ 2,093,784	$ 2,700,541	$ 1,825,004	$ 1,393,708	$ 1,486,227	$ 1,242,001	$ 1,032,062	$ 8,636,134	$ 5,153,998	$ 4,416,009
Gross profit	371,564	327,555	421,294	286,554	187,055	241,074	204,931	167,236	1,406,967	800,296	685,518
NET EARNINGS	147,006	125,747	175,360	104,251	64,757	78,861	69,694	40,570	552,364	253,882	182,404
Net earnings attributable to controlling interest	$ 137,906	$ 121,041	$ 173,382	$ 103,311	$ 62,952	$ 77,204	$ 66,463	$ 40,159	$ 535,640	$ 246,778	$ 179,650
EARNINGS PER SHARE - BASIC (USD per share)	$ 2.21	$ 1.94	$ 2.79	$ 1.67	$ 1.02	$ 1.25	$ 1.08	$ 0.65	$ 8.61	$ 4	$ 2.91
EARNINGS PER SHARE - DILUTED (USD per share)	$ 2.21	$ 1.94	$ 2.78	$ 1.67	$ 1.02	$ 1.25	$ 1.08	$ 0.65	$ 8.59	$ 4	$ 2.91
Minimum
Length of fiscal quarter									91 days	91 days

SUBSEQUENT EVENTS (Details)

SUBSEQUENT EVENTS (Details) - Subsequent Event - USD ($) shares in Millions, $ in Millions	Dec. 27, 2021	Feb. 15, 2022
Subsequent Event
Additional shares authorized for repurchase (in shares)		1.5
Cumulative total authorized shares available for repurchase (in shares)		2.6
Ultra
Subsequent Event
Percentage of stock purchase (as a percent)	100.00%
Purchase Price	$ 26.8