PGT Innovations (PGTI) 10-Q 13 May 21 2021 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Apr. 03, 2021	Apr. 30, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Apr. 3, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Trading Symbol	PGTI
Entity Registrant Name	PGT Innovations, Inc.
Entity Central Index Key	0001354327
Current Fiscal Year End Date	--01-01
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity File Number	001-37971
Entity Tax Identification Number	20-0634715
Entity Address, Address Line One	1070 Technology Drive
Entity Address, City or Town	North Venice
Entity Address, State or Province	FL
Entity Address, Postal Zip Code	34275
City Area Code	941
Local Phone Number	480-1600
Entity Common Stock, Shares Outstanding		59,544,807
Title of 12(b) Security	Common stock, par value $0.01 per share
Security Exchange Name	NYSE
Entity Interactive Data Current	Yes
Entity Incorporation, State or Country Code	DE
Document Quarterly Report	true
Document Transition Report	false

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 03, 2021	Apr. 04, 2020
Income Statement [Abstract]
Net sales	$ 271,092	$ 220,204
Cost of sales	177,130	139,077
Gross profit	93,962	81,127
Selling, general and administrative expenses	69,766	54,220
Income from operations	24,196	26,907
Interest expense, net	7,457	7,169
Income before income taxes	16,739	19,738
Income tax expense	3,944	4,138
Net income	12,795	15,600
Less: Net income attributable to redeemable non-controlling interest	411
Net income attributable to the Company	12,384	15,600
Change in redemption value of redeemable non-controlling interest	0	0
Net income attributable to common shareholders	$ 12,384	$ 15,600
Net income per common share attributable to common shareholders:
Basic	$ 0.21	$ 0.27
Diluted	$ 0.21	$ 0.26
Weighted average number of common shares outstanding:
Basic	59,286	58,668
Diluted	59,894	59,121

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Apr. 04, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 12,795	$ 15,600
Other comprehensive income (loss) before tax:
Change in fair value of derivatives	8,288	(5,213)
Reclassification to earnings	(1,775)	612
Other comprehensive income (loss) before tax	6,513	(4,601)
Income tax expense (benefit) related to other comprehensive income	1,618	(1,151)
Other comprehensive income (loss), net of tax	4,895	(3,450)
Comprehensive income	17,690	12,150
Less: Comprehensive income attributable to redeemable non-controlling interest	411
Comprehensive income attributable to the Company	$ 17,279	$ 12,150

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Apr. 03, 2021	Jan. 02, 2021
Current assets:
Cash and cash equivalents	$ 58,979	$ 100,320
Accounts receivable, net	117,239	92,844
Inventories	72,352	60,317
Contract assets, net	49,225	28,723
Prepaid expenses	10,627	8,357
Other current assets	17,916	11,111
Total current assets	326,338	301,672
Property, plant and equipment, net	160,129	135,155
Operating lease right-of-use asset, net	65,763	38,567
Intangible assets, net	324,458	256,507
Goodwill	359,746	329,695
Other assets, net	3,224	925
Total assets	1,239,658	1,062,521
Current liabilities:
Accounts payable and accrued liabilities	111,892	84,344
Current portion of operating lease liability	8,682	6,132
Total current liabilities	120,574	90,476
Long-term debt	474,265	412,098
Operating lease liability, less current portion	60,140	35,130
Deferred income taxes	29,947	28,329
Other liabilities	10,971	11,354
Total liabilities	695,897	577,387
Redeemable non-controlling interest	34,495
Shareholders' equity:
Preferred stock; par value $.01 per share; 10,000 shares authorized; no shares outstanding
Common stock; par value $.01 per share; 200,000 shares authorized; 63,106 and 62,542 shares issued and 59,461 and 58,999 shares outstanding at April 3, 2021 and January 2, 2021, respectively	631	625
Additional paid-in-capital	427,210	420,202
Accumulated other comprehensive income	7,615	2,720
Retained earnings	92,119	79,896
Treasury stock at cost	(18,309)	(18,309)
Total shareholders' equity	509,266	485,134
Total liabilities, redeemable non-controlling interest and shareholders' equity	$ 1,239,658	$ 1,062,521

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Apr. 03, 2021	Jan. 02, 2021
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, Shares authorized	10,000,000	10,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, Shares authorized	200,000,000	200,000,000
Common stock, shares issued	63,106,000	62,542,000
Common stock, shares outstanding	59,461,000	58,999,000

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Apr. 04, 2020
Cash flows from operating activities:
Net income	$ 12,795	$ 15,600
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation	6,697	5,186
Amortization	4,749	4,742
Provision for allowance for doubtful accounts	2,411	646
Stock-based compensation	1,750	1,530
Amortization of deferred financing costs, debt discount and premium	230	311
Loss (gain) on sales of assets	67	(82)
Change in operating assets and liabilities (net of effects of acquisition):
Accounts receivable	(24,980)	(17,857)
Inventories	(4,307)	(4,039)
Contract assets, net, prepaid expenses, other current and other assets	(20,898)	(1,029)
Accounts payable, accrued and other liabilities	20,039	5,916
Net cash (used in) provided by operating activities	(1,447)	10,924
Cash flows from investing activities:
Purchases of property, plant and equipment	(6,512)	(2,327)
Investment in and acquisition of businesses	(94,321)	(90,145)
Proceeds from sales of assets	7	82
Net cash used in investing activities	(100,826)	(92,390)
Cash flows from financing activities:
Proceeds from issuance of senior notes	63,300	53,188
Payments of financing costs	(1,363)	(1,266)
Purchases of common stock relating to tax withholdings on employee equity awards	(1,005)	(815)
Proceeds from exercise of stock options		549
Proceeds from issuance of common stock under employee stock purchase plan (ESPP)		119
Net cash provided by financing activities	60,932	51,775
Net decrease in cash and cash equivalents	(41,341)	(29,691)
Cash and cash equivalents at beginning of period	100,320	97,243
Cash and cash equivalents at end of period	58,979	67,552
Non-cash activity:
Issuance of common stock in Eco Acquisition	6,108
Establish right-of-use asset	29,490	14,605
Establish operating lease liability	(29,490)	(14,605)
Property, plant and equipment additions in accounts payable	$ 1,022	$ 119

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 28, 2019	$ 431,548	$ 619	$ 414,688	$ (238)	$ 34,788	$ (18,309)
Beginning Balance, Shares at Dec. 28, 2019		58,504,734
Vesting of restricted stock, Shares		175,824
Grants of restricted stock		$ 6	(6)
Forfeitures of restricted stock		$ (1)	1
Purchases of treasury stock	(815)					(815)
Purchases of treasury stock, Shares		(51,479)
Retirement of treasury stock		$ (1)	(814)			815
Stock-based compensation	1,530		1,530
Change in redemption value of redeemable non-controlling interest	0
Exercise of stock options	549	$ 3	546
Exercise of stock options, Shares		274,353
Common stock issued under ESPP	119		119
Common stock issued under ESPP, Shares		15,191
Net income attributable to the Company	15,600				15,600
Other comprehensive income (loss)	(3,450)			(3,450)
Ending Balance at Apr. 04, 2020	445,081	$ 626	416,064	(3,688)	50,388	(18,309)
Ending Balance, Shares at Apr. 04, 2020		58,918,623
Beginning Balance at Jan. 02, 2021	485,134	$ 625	420,202	2,720	79,896	(18,309)
Beginning Balance, Shares at Jan. 02, 2021		58,998,711
Vesting of restricted stock, Shares		147,106
Grants of restricted stock		$ 3	(3)
Forfeitures of restricted stock		$ (1)	1
Purchases of treasury stock	(1,005)					(1,005)
Purchases of treasury stock, Shares		(42,414)
Retirement of treasury stock			(844)		(161)	1,005
Stock-based compensation	1,750		1,750
Issuance in acquisition of Eco	6,108	$ 4	6,104
Issuance in acquisition of Eco, Shares		357,797
Change in redemption value of redeemable non-controlling interest	0
Net income attributable to the Company	12,384				12,384
Other comprehensive income (loss)	4,895			4,895
Ending Balance at Apr. 03, 2021	$ 509,266	$ 631	$ 427,210	$ 7,615	$ 92,119	$ (18,309)
Ending Balance, Shares at Apr. 03, 2021		59,461,200

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Apr. 04, 2020
Statement Of Stockholders Equity [Abstract]
Income tax (benefit) expense related to components of other comprehensive income (loss)	$ 1,618	$ (1,151)

Description of Business and Bas

Description of Business and Basis of Presentation	3 Months Ended
	Apr. 03, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Description of Business and Basis of Presentation	NOTE 1. DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION About PGT Innovations, Inc. The accompanying unaudited condensed consolidated financial statements include the accounts of PGT Innovations, Inc. and its direct and indirect wholly-owned subsidiaries, including, PGT Industries, Inc., CGI Window and Door Holdings, Inc. (“CGI”), CGI Commercial, Inc. (“CGIC”), WinDoor, Incorporated, Coyote Acquisition Co., WWS Acquisition LLC (formerly known as GEF WW Parent LLC) (“WWS”), and with their acquisition by PGT Innovations, Inc. effective on February 1, 2020, NewSouth Window Solutions LLC, and NewSouth Window Solutions of Orlando LLC (“NewSouth”), as well as, as of and for the period from February 1, 2021 through April 3, 2021, the accounts of Eco Enterprises, LLC (formerly New Eco Windows Holding, LLC), and its subsidiaries Eco Windows Systems, LLC, Eco Glass Production, LLC, and Unity Windows, LLC (together “Eco”), relating to our acquisition of a 75% PGT Innovations, Inc. (“PGTI,” “we,” or the “Company”), formerly named PGT, Inc., manufactures and supplies premium windows and doors. Our highly-engineered products can withstand some of the toughest weather conditions on earth and unify indoor/outdoor living spaces. We are also the nation’s largest manufacturer of impact-resistant windows and doors. Our family of brands include CGI®, PGT® Custom Windows & Doors, WinDoor®, Western Window Systems®, CGI Commercial®, Eze-Breeze®, NewSouth Window Solutions®, and Eco Windows Systems®. Our products other than NewSouth products are sold through an authorized dealer and distributor network. Our NewSouth products are sold directly to the end-user consumer through store-front locations throughout Florida, and through direct-to-homeowner door-to-door sales. We are also opening NewSouth store-front locations in other states as part of our strategy of expanding NewSouth’s geographic presence, including new locations opened in 2020 in Charleston, South Carolina, Pensacola, Florida, and Houston, Texas. The majority of our sales are to customers in the state of Florida, which further increased with our acquisition of Eco, but we sell products to customers in many states, including the western United States through WWS. We also have sales in the Caribbean, Canada, and in South and Central America. See Note 6 for a discussion of the Eco Acquisition. We were incorporated in the state of Delaware on December 16, 2003, as JLL Window Holdings, Inc., with primary operations in North Venice, Florida. On February 15, 2006, our Company was renamed PGT, Inc. On December 14, 2016, we announced that we changed our name to PGT Innovations, Inc. and, effective on December 28, 2016, the listing of our common stock was transferred to the New York Stock Exchange (“NYSE”) from the NASDAQ Global Market (NASDAQ), and began trading on the NYSE under its existing ticker symbol of “PGTI”. We have six window manufacturing operations in Florida, and one in Arizona. Our manufacturing facilities in Florida include one in North Venice, four in the greater Miami area, which includes two as a result of our investment in Eco, and one in Tampa with the acquisition of NewSouth. Our Arizona operations are in Phoenix. Regarding glass processing, we have two glass tempering and laminating plants and one insulation glass plant, all located in North Venice. Our Eco investment also has a glass processing facility in the greater Miami, Florida area. All references to PGTI or our Company apply to the consolidated financial statements of PGT Innovations, Inc. unless otherwise noted. COVID-19 Pandemic During March 2020, a global pandemic (the “Pandemic”) was declared by the World Health Organization related to the rapidly growing outbreak of a novel strain of coronavirus (“COVID-19”). The Pandemic has resulted in a significant number of infections, hospitalizations and deaths in several of our key markets, including Arizona, California, Florida and Texas. The Pandemic has significantly affected economic conditions in those markets, and in the United States in general, and internationally, including due to federal, state and local governments and employers reacting to the public health crisis with mitigation measures, and also due to the general fear and uncertainty created by the Pandemic, all of which has resulted in workforce, supply chain and production disruptions, along with reduced demand and spending in many industries and markets, including in our core markets in the western United States (“U.S.”), creating significant uncertainties in the U.S. economy. Although many of the government-mandated restrictions on economic and social activities that were put in place as part of the initial response to the Pandemic have been lifted, and vaccines with high degrees of efficacy have been approved, with others pending approval, by the United States Food and Drug Administration, or when the nation-wide program of vaccination will result in herd immunity to the coronavirus in the United States or globally, which is being impacted by several factors, including vaccine hesitancy or resistance, it is still currently unclear when, or if, social, business, occupational, educational and economic conditions will return to pre-Pandemic conditions. The extent to which the continuing circumstances around the Pandemic could affect our future business, operations and financial results will depend upon numerous evolving factors that we are not able to accurately predict, including the timing of any relief that may come from the current program of nationwide vaccinations and its effect on the duration of the continuing economic and market disruptions related to the Pandemic, and whether such vaccines are effective against any new variants of coronavirus, and the nature, amounts and duration of any additional government stimulus measures designed to bolster the economy. As such, we continue to be unable to accurately predict the impact the Pandemic and the challenges it has created for the U.S. and global economies, will have on our financial performance and operations going forward due to numerous uncertainties, including the severity of the disease, the duration of the outbreak, when or if herd immunity is achieved in the United States, especially in our key markets, actions that may be taken by governmental authorities to attempt to control the Pandemic, the impact to our customers’ and suppliers’ businesses and other factors identified in Part I, Item 1A “Risk Factors” in our Annual Report on Form 10-K, filed with the United States Securities and Exchange Commission on March 2, 2021. We will continue to evaluate the nature and extent of the impact of the Pandemic to our business, consolidated results of operations, and financial condition. Basis of Presentation These condensed consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and do not include all the information and footnotes required by United States Generally Accepted Accounting Principles (“GAAP”) for complete financial statements. In the opinion of management, all adjustments (consisting only of normal recurring adjustments) considered necessary for a fair presentation have been included. Operating results for the interim period are not necessarily indicative of the results that may be expected for the remainder of the current year or for any future periods. The Company’s fiscal first quarter in 2021 ended April 3, 2021, consisted of 13 weeks, and our fiscal first quarter in 2020 ended April 4, 2020, consisted of 14 weeks. The condensed consolidated balance sheet as of January 2, 2021, is derived from the audited consolidated financial statements, but does not include all disclosures required by GAAP. The condensed consolidated balance sheet as of January 2, 2021, and the unaudited condensed consolidated financial statements as of and for the periods ended April 3, 2021 and April 4, 2020, should be read in conjunction with the more detailed audited consolidated financial statements for the year ended January 2, 2021, included in the Company’s most recent Annual Report on Form 10-K. The accounting policies used in the preparation of these unaudited condensed consolidated financial statements are consistent with the accounting policies described in the Notes to Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K. The preparation of financial statements in conformity with GAAP requires management 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, and the reported amounts of revenues and expenses during the reporting period. Actual results could materially differ from those estimates. As described above, the extent to which the COVID-19 pandemic and resulting measures that may be taken by the Company and/or its customers or suppliers and/or by governmental entities will impact the Company's business will depend on future developments, which are highly uncertain and cannot be precisely predicted at this time. Management's estimates and assumptions are highly dependent on estimates of future developments and may change significantly in the future due to unforeseen direct and indirect impacts of the COVID-19 pandemic. We have two reportable segments: the Southeast segment and the Western segment. The Southeast reporting segment, which is also an operating segment, is composed of sales from our facilities in Florida. The Western reporting segment, also an operating segment, is composed of sales from our facility in Arizona. See Note 16 for segment disclosures. Recently Adopted Accounting Pronouncements Accounting for Income Taxes In December 2019, the FASB issued ASU 2019-12, “Simplifying the Accounting for Income Taxes.” ASU 2019-12 simplifies the accounting for income taxes by removing certain exceptions to the general principles and also clarifies and amends existing guidance. This standard is effective beginning January 1, 2021, with early adoption permitted. The adoption of this standard did not have any impact on our consolidated financial statements. Recently Issued Accounting Pronouncements Reference Rate Reform In March 2020, the FASB issued ASU 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting” and in March 2021, subsequent amendment to the initial guidance, ASU 2021-01, “Reference Rate Reform (Topic 848): Scope” (collectively, “Topic 848”). Topic 848 provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The amendments apply only to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. The guidance generally can be applied from March 12, 2020 through December 31, 2022. We are currently assessing the impacts of the practical expedients provided in Topic 848 and which, if any, we will adopt.

Revenue Recognition and Contrac

Revenue Recognition and Contracts with Customers	3 Months Ended
	Apr. 03, 2021
Revenue From Contract With Customer [Abstract]
Revenue Recognition and Contracts with Customers	NOTE 2. REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS Revenue Recognition Accounting Policy The Company primarily manufactures fully customized windows and doors based on design specifications, measurements, colors, finishes, framing materials, glass-types, and other options selected by the customer at the point in time an order is received. The Company has an enforceable right to payment at the time an order is received and accepted at the agreed-upon sales prices contained in our agreements with our customers for all manufacturing efforts expended on behalf of its customers. Due to the customized build-to-order nature of these products, the Company’s assessment is that the substantial portion of its finished goods and certain unused glass components have no alternative use, and that control of these products and components passes to the customer over time during the manufacturing of the products in an order, or upon our receipt of certain pre-cut glass components from our supplier attributed to specific customer orders. Based on these factors, the Company recognizes a substantial portion of revenue over time during the manufacturing process once customization begins, and for certain unused glass components on hand, at the end of a reporting period. Revenue on work-in-process at the end of a reporting period is recognized in proportion to costs incurred to total estimated cost of the product being manufactured. Except for the Western segment’s volume products, discussed in the section titled Disaggregation of Revenue from Contracts with Customers below, revenue recognized at a point in time is immaterial. Disaggregation of Revenue from Contracts with Customers As discussed in Note 1, we have two reportable segments: our Southeast segment and our Western segment. See Note 16 for more information. The following tables provide information about our net sales by reporting segment, product category and market for the three months ended April 3, 2021 and April 4, 2020 (dollars in millions): Three Months Ended April 3, April 4, Disaggregation of revenue (in millions) : 2021 2020 Reporting segment: Southeast $ 233.6 $ 183.6 Western 37.5 36.6 Total net sales $ 271.1 $ 220.2 Product category: Impact-resistant window and door products $ 191.4 $ 153.6 Non-impact window and door products 79.7 66.6 Total net sales $ 271.1 $ 220.2 Market: New construction $ 120.0 $ 109.1 Repair and remodel 151.1 111.1 Total net sales $ 271.1 $ 220.2 The Company’s Western segment includes both custom and volume products. This segment’s volume products are not made-to-order and are of standardized sizes and design specifications. Therefore, the Company’s assessment is that the Western segment’s volume products have alternative uses, and that control of these products passes to the customer at a point in time, which is typically when the product has been delivered to the customer. For the three months ended April 3, 2021 and April 4, 2020, the Western segment’s net sales of its volume products were $19.6 million and $15.2 million, respectively. Contract Balances Contract assets represent sales recognized in excess of billings related to finished goods not yet shipped and certain unused glass components not yet placed into the production process for which revenue is recognized over time as noted above. Contract liabilities relate to customer deposits at the end of reporting periods. At April 3, 2021 and January 2, 2021, those contract liabilities totaled $34.0 $22.8 $27.8 $18.1 $6.2 $4.6 $49.2 $28.7 Because of the short-term nature of our performance obligations, as discussed below, substantially all of our performance obligations are satisfied within the quarter following the end of a reporting period. As such, substantially all of the contract liabilities at January 2, 2021 were satisfied in the first quarter of 2021, and contract assets at January 2, 2021 were transferred to accounts receivable in the first quarter of 2021. Contract liabilities at April 3, 2021 represents cash received during the three-month period ended April 3, 2021, excluding amounts recognized as revenue during that period. Contract assets at April 3, 2021 represents revenue recognized during the three-month period ended April 3, 2021, excluding amounts transferred to accounts receivable during that period. Performance Obligations A performance obligation is a promise in a contract to transfer a distinct good or service to the customer and is defined as the unit of account. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue as the performance obligation is satisfied. Our contracts with our customers generally represent an approved purchase order together with our standard terms and conditions. Our custom product contracts include distinct goods that are substantially the same and have the same pattern of transfer to the customer over time, and therefore represent a series of distinct goods accounted for as a single performance obligation. For volume products, we allocate the contract’s transaction price to each distinct performance obligation based on the estimated relative standalone selling price of each distinct good. Observable standalone sales are used to determine the standalone selling price. Certain customers are eligible for rebates based on their volume or purchases during an annual period. Rebates are recorded as a reduction to sales and were immaterial in all periods presented. Performance obligations are satisfied over time, generally for our custom products, and as of a point in time for our volume products. Performance obligations are supported by contracts with customers, and we have elected not to disclose our unsatisfied performance obligations as of April 3, 2021 under the short-term contract exemption as we expect such performance obligations will be satisfied within the quarter following the end of a reporting period. On February 1, 2021, we completed our investment in Eco. Eco’s contracts with customers include the manufacturing of goods and installation services related to those goods. Both the manufacturing of goods and installation services represent distinct and separate performance obligations of Eco. As the goods are custom in nature, and Eco ensures its ability to collect payment from the customer by collecting a substantial portion of the contract price before production begins, the performance obligations are satisfied over time, as opposed to a point in time. The contract transaction price is allocated to each performance obligation based on an estimate of stand-alone selling price. Because installation is performed shortly after completion of production, revenue on the total contract is recognized over a relatively short period of time. Policies Regarding Shipping and Handling Costs and Commissions on Contract Assets The Company has made a policy election to continue to recognize shipping and handling costs as a fulfillment activity. Treating shipping and handling as a fulfillment activity requires estimated shipping and handling costs for undelivered products and certain glass components on which we have recognized revenue and created a contract asset, to be accrued to match this cost with the recognized revenue. Sales taxes collected from customers are recorded on a net basis. The Company utilizes the practical expedient which permits expensing of costs to obtain a contract when the expected amortization period is one year or less, which typically results in expensing commissions paid to employees. We expense sales commissions paid to employees as sales are recognized, including sales from the creation of contract assets, as the expected amortization period is less than one year. Allowance for Doubtful Accounts In the ordinary course of business, we extend credit to qualified dealers and distributors, generally on a non-collateralized basis. The Company maintains an allowance for doubtful accounts which is based on management’s assessments of the amount which may become uncollectible in the future and is determined through consideration of our write-off history, specific identification of uncollectible accounts based in part on the customer’s past due balance (based on contractual terms), and consideration of prevailing economic and industry conditions, and may include anticipated unfavorable impacts of the COVID-19 pandemic on the businesses of our customers, such as dealers and distributors. Uncollectible accounts are written off after repeated attempts to collect from the customer have been unsuccessful. As of April 3, 2021 and January 2, 2021, the allowance for doubtful accounts was million and million, respectively.

Warranty

Warranty	3 Months Ended
	Apr. 03, 2021
Guarantees And Product Warranties [Abstract]
Warranty	NOTE 3. WARRANTY Most of our manufactured products are sold with warranties. Warranty periods, which vary by product components, generally range from 1 to 10 years; however, the warranty period for a limited number of specifically identified components in certain applications is a lifetime. The majority of the products sold have warranties on components which range from 1 to 3 years. The amount charged to expense for warranties is based on management’s assessment of the cost per service call and the number of service calls expected to be incurred to satisfy warranty obligations on the current net sales. During the three months ended April 3, 2021, we recorded warranty expense at a rate of approximately 2.6% 1.7% The following table summarizes current period charges, adjustments to previous estimates, if necessary, as well as settlements, which represent actual costs incurred during the period for the three months ended April 3, 2021 and April 4, 2020. The reserve is determined through specific identification and assessing Company history. Expected future obligations are discounted to a current value using a risk-free rate for obligations with similar maturities. Of the accrued warranty reserve of $9.6 $7.8 $8.0 $6.5 Beginning Acquisition- Charged End of Accrued Warranty of Period Related to Expense Adjustments Settlements Period (in thousands) Three months ended April 3, 2021 $ 8,001 $ — $ 6,966 $ 389 $ (5,713 ) $ 9,643 Three months ended April 4, 2020 $ 6,244 $ 1,592 $ 3,841 $ (20 ) $ (4,269 ) $ 7,388

Inventories

Inventories	3 Months Ended
	Apr. 03, 2021
Inventory Disclosure [Abstract]
Inventories	NOTE 4. INVENTORIES Inventories consist principally of raw materials purchased for the manufacture of our products. We have limited finished goods inventory since the substantial majority of our products are custom, made-to-order and the revenue on these products, as well as the related cost, has been fully recognized upon completion of the manufacturing process. Finished goods inventory and work-in-progress costs include direct materials, direct labor, and overhead. All inventories are stated at the lower of cost (first-in, first-out method) or net realizable value. Inventories consisted of the following: April 3, January 2, 2021 2021 (in thousands) Raw materials $ 66,179 $ 55,916 Work-in-progress 5,718 4,058 Finished goods 455 343 $ 72,352 $ 60,317

Stock Based Compensation

Stock Based Compensation	3 Months Ended
	Apr. 03, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Based Compensation	NOTE 5. STOCK BASED-COMPENSATION We record stock compensation expense over an equity award’s vesting period based on the award’s fair value at the date of grant. We recorded compensation expense for stock-based awards of $1.8 $1.5 $11.2 Of the $1.8 $1.5 $1.5 $1.4

Acquisitions

Acquisitions	3 Months Ended
	Apr. 03, 2021
Business Combinations [Abstract]
Acquisitions	NOTE 6. ACQUISITIONS ECO WINDOW SYSTEMS On February 1, 2021, we completed an acquisition of a 75% $100.4 $94.3 $5.6 $6.1 $60.0 105.5% $3.3 $31.0 The common stock portion of the purchase price was represented by the issuance of 357,797 $21.34 $7.6 25% three-year 20% $34.1 $134.5 25% 5% The estimated fair value of assets acquired, and liabilities assumed as of the closing date, are as follows: Preliminary Allocation Accounts receivable $ 5,031 Inventories 7,728 Contract assets, net 4,312 Prepaid expenses and other assets 1,706 Property and equipment 24,009 Operating lease right-of-use asset 27,864 Intangible assets 72,700 Goodwill 30,051 Total assets acquired 173,401 Accounts payable (6,809 ) Accrued and other liabilities, including customer deposits (4,215 ) Operating lease liability (27,864 ) Total liabilities assumed (38,888 ) Net assets acquired 134,513 Redeemable non-controlling interest (34,084 ) Fair value of consideration transferred $ 100,429 Consideration: Cash $ 94,321 PGTI common stock 6,108 Fair value of consideration transferred $ 100,429 The fair value of certain working capital related items, including Eco’s accounts receivable, prepaid and other expenses, and accounts payable and accrued liabilities, approximated their book values at the date of the Eco Acquisition. Subsequent to our initial allocation, we adjusted the fair value of certain acquired commercial receivable accounts based on a further post-acquisition assessment of their collectability. The fair value of inventory was estimated by major category, at net realizable value, which we believe approximates the price a market participant could achieve in a current sale. Substantially all of inventories at the acquisition date was composed of raw materials. The fair value of property and equipment is being estimated with the assistance of a third-party valuation firm, using the indirect cost approach, which we consider to be Level 3 in the fair value hierarchy. Valuations of the intangible assets have been estimated using income and royalty relief approaches based on projections, which we consider to be Level 3 inputs, with the assistance of a third-party valuation firm. We incurred acquisition costs totaling $1.7 which includes $1.0 million in the fourth quarter of 2020, and $0.7 million in first quarter of 2021, The remaining consideration, after identified intangible assets and the net assets and liabilities recorded at fair value, has currently been estimated to be $30.1 75% As of April 3, 2021, the purchase price allocation is still preliminary, and its finalization may result in changes to the preliminary estimate of goodwill. Goodwill represents the strengthening of our supply chain for glass through faster glass production, as well as diversification and expansion of product offerings in the high-growth commercial market, and an expansion of our dealer network with minimal overlap with our existing deal network. Valuation of Identified Intangible Assets The valuation of the identifiable intangible assets acquired in the Eco Acquisition and our estimate of their respective useful lives are as follows: Initial Preliminary Useful Life Valuation (in years) (in thousands) Trade name $ 36,000 indefinite Customer relationships 36,700 5 - 15 Intangible assets, net $ 72,700 Pro Forma Financial Information The following unaudited pro forma financial information assumes the Eco Acquisition had occurred at the beginning of the earliest period presented that does not include Eco’s actual results for the entire period. Pro forma results have been prepared by adjusting our historical results to include the results of Eco adjusted for the following: amortization expense related to the estimated intangible assets arising from the acquisition and interest expense to reflect the Second Additional Senior Notes. The unaudited pro forma results below do not necessarily reflect the results of operations that would have resulted had the acquisition been completed at the beginning of the earliest periods presented, nor does it indicate the results of operations in future periods. The unaudited pro forma results do not include the impact of synergies, nor any potential impacts on current or future market conditions which could alter the following unaudited pro forma results. Three Months Ended April 3, April 4, 2021 2020 (unaudited) Net sales $ 279,044 $ 231,353 Net income attributable to PGTI stockholders: $ 12,542 $ 15,297 Net income per common share attributable to PGTI stockholders: Basic $ 0.21 $ 0.26 Diluted $ 0.21 $ 0.26 Net sales of Eco included in the condensed consolidated statement of operations for the three months ended April 3, 2021, was nearly $16 million. The net income of Eco in the condensed consolidated statement of operations for the three months ended April 3, 2021, after allocation of interest expense and other corporate costs to Eco, was $1.6 million, including the portion attributable to the redeemable non-controlling interest of $411 thousand. NEWSOUTH WINDOW SOLUTIONS On February 1, 2020 The estimated fair value of assets acquired, and liabilities assumed as of the closing date, were as follows: Final Allocation Accounts receivable $ 8,434 Inventories 2,936 Contract assets, net 4,413 Prepaid expenses and other assets 1,756 Property and equipment 7,433 Operating lease right-of-use asset 10,578 Intangible assets 27,370 Goodwill 52,094 Accounts payable (6,621 ) Accrued and other liabilities (7,447 ) Operating lease liability (10,578 ) Purchase price $ 90,368 Consideration: Cash $ 90,368 Total fair value of consideration $ 90,368 The fair value of certain working capital related items, including NewSouth’s retail accounts receivable, prepaid expenses, and accounts payable and accrued liabilities, approximated their book values at the date of the NewSouth Acquisition. Subsequent to our initial allocation, we adjusted the fair value of certain acquired commercial receivable accounts based on a further post-acquisition assessment of their collectability. The fair value of inventory was estimated by major category, at net realizable value. The substantial majority of inventories at the acquisition date was composed of raw materials. The fair value of property and equipment and remaining useful lives were estimated by management, with the assistance of a third-party valuation firm, using the cost approach. Valuations of the intangible assets were done using income and royalty relief approaches based on projections provided by management, which we consider to be Level 3 inputs, with the assistance of a third-party valuations firm. We incurred acquisition costs totaling $2.4 which includes $0.9 million in 2020, and $1.5 million in 2019. Of the expenses in 2020, $0.5 million were incurred in the first quarter of 2020, and The remaining consideration, after identified intangible assets and the net assets and liabilities recorded at fair value, has been determined to be $52.1 Valuation of Identified Intangible Assets The valuation of the identifiable intangible assets acquired in the NewSouth Acquisition and our estimate of their respective useful lives are as follows: Initial Final Useful Life Valuation (in years) (in thousands) Trade name $ 22,200 15 Non-compete agreements 1,670 5 Developed technology 2,600 6 Customer-related intangible 900 <1 Intangible assets, net $ 27,370 Pro Forma Financial Information The following unaudited pro forma financial information assumes the acquisition had occurred at the beginning of the earliest period presented that does not include NewSouth’s actual results for the entire period. Pro forma results have been prepared by adjusting our historical results to include the results of NewSouth adjusted for the following: amortization expense related to the intangible assets arising from the acquisition and interest expense to reflect the First Additional Senior Notes. The unaudited pro forma results below do not necessarily reflect the results of operations that would have resulted had the acquisition been completed at the beginning of the earliest periods presented, nor does it indicate the results of operations in future periods. The unaudited pro forma results do not include the impact of synergies, nor any potential impacts on current or future market conditions which could alter the following unaudited pro forma results. Three Months Ended April 4, 2020 (unaudited) Net sales 227,956 Net income 15,830 Net income per common share: Basic $ 0.27 Diluted $ 0.27

Net Income Per Common Share

Net Income Per Common Share	3 Months Ended
	Apr. 03, 2021
Earnings Per Share [Abstract]
Net Income Per Common Share	NOTE 7. NET INCOME PER COMMON SHARE Basic earnings per share (“EPS”) is computed by dividing net income available to common shareholders by the weighted-average number of common shares outstanding during the period. Diluted EPS reflects the dilutive effect of potential common shares from securities such as stock options and unvested stock awards. There were no anti-dilutive securities excluded from the calculation of weighted average shares outstanding for the three months ended April 3, 2021, and 586 The table below presents the calculation of EPS and a reconciliation of weighted average common shares used in the calculation of basic and diluted EPS : Three Months Ended April 3, April 4, 2021 2020 (in thousands, except per share amounts) Net income $ 12,795 $ 15,600 Less: Net income attributable to redeemable non-controlling interest 411 — Net income attributable to the Company 12,384 15,600 Change in redemption value of redeemable non-controlling interest — — Net income attributable to common shareholders $ 12,384 $ 15,600 Weighted-average common shares - Basic 59,286 58,668 Add: Dilutive shares from equity plans 608 453 Weighted-average common shares - Diluted 59,894 59,121 Net income per common share attributable to common shareholders: Basic $ 0.21 $ 0.27 Diluted $ 0.21 $ 0.26

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	3 Months Ended
	Apr. 03, 2021
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	NOTE 8. GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill and intangible assets are as follows: Initial April 3, January 2, Useful Life 2021 2021 (in years) (in thousands) Goodwill $ 359,746 $ 329,695 indefinite Other intangible assets: Trade names (indefinite-lived) $ 176,841 $ 140,841 indefinite Customer relationships and customer-related assets 238,247 201,547 <1-15 Trade name (amortizable) 22,200 22,200 15 Developed technology 5,600 5,600 6-10 Non-compete agreement 3,338 3,338 2-5 Software license 590 590 2 Less: Accumulated amortization (122,358 ) (117,609 ) Subtotal 147,617 115,666 Other intangible assets, net $ 324,458 $ 256,507 Goodwill at January 2, 2021 $ 329,695 Increase in goodwill from our investment in Eco 30,051 Goodwill at April 3, 2021 $ 359,746 Trade names at January 2, 2021 $ 140,841 Increase in trade names from our investment in Eco 36,000 Trade names at April 3, 2021 $ 176,841 Estimated amortization of our amortizable intangible assets for future years is as follows: (in thousands) Total Remainder of 2021 $ 15,247 2022 19,342 2023 17,181 2024 17,135 2025 16,896 Thereafter 61,816 Total $ 147,617 Amortization expense relating to amortizable intangible assets for the three months ended April 3, 2021 and April 4, 2020, was $4.7 $4.7 We perform our annual goodwill and indefinite-lived intangible asset impairment testing on the first day of our fiscal fourth quarter of each year, and at interim periods if needed based on occurrence of triggering events. During the three months ended April 3, 2021, we did not identify any events which we believe would trigger the need for tests for impairments of our indefinite-lived intangibles assets. As of April 3, 2021 and January 2, 2021, the carrying value of our Southeast reporting unit goodwill is $231.3 $201.3 $128.4 $128.4

Long-Term Debt

Long-Term Debt	3 Months Ended
	Apr. 03, 2021
Debt Disclosure [Abstract]
Long-Term Debt	NOTE 9. LONG-TERM DEBT April 3, January 2, 2021 2021 (in thousands) 2018 Senior Notes due 2026, maturing in August 2026 $ 425,000 $ 365,000 2016 Credit Agreement due 2022, maturing in October 2022 54,000 54,000 Long-term debt 479,000 419,000 Fees, costs, discount and premium (4,735 ) (6,902 ) Long-term debt, net $ 474,265 $ 412,098 2018 Senior Notes due 2026 On August 10, 2018, we completed the issuance of $315.0 On January 24, 2020, we completed an add-on issuance of $50.0 $3.2 $90.4 On January 25, 2021, we completed a second add-on issuance of $60.0 105.5% $3.3 $31.0 million in cash on hand, to pay the $94.3 $100.4 357,797 $21.34 20% The 2018 Senior Notes due 2026 mature on August 10, 2026. Interest on the 2018 Senior Notes due 2026 is payable semi-annually, in arrears, beginning on February 16, 2019, with interest accruing at a rate of 6.75% per annum from August 10, 2018. We incurred financing costs relating to bank fees and professional services costs relating to the offering and issuance of the 2018 Senior Notes due 2026 totaling $10.4 $1.3 $3.2 $1.4 $3.3 As of April 3, 2021, the face value of debt outstanding under the 2018 Senior Notes due 2026 was $425.0 $4.9 The indenture for the 2018 Senior Notes due 2026 gives us the option to redeem some or all of the 2018 Senior Notes due 2026 at the redemption prices and on the terms specified in the indenture governing the 2018 Senior Notes due 2026. The indenture governing the 2018 Senior Notes due 2026 does not require us to make any mandatory redemptions or sinking fund payments. However, upon the occurrence of a change of control, as defined in the indenture, the Company is required to offer to repurchase the notes at 101% of the aggregate principal amount thereof, plus accrued and unpaid interest, if any, to the date of purchase. The indenture for the 2018 Senior Notes due 2026 includes certain covenants limiting the ability of the Company and any guarantors to, (i) incur additional indebtedness; (ii) pay dividends on or make distributions in respect of capital stock or make certain other restricted payments or investments; (iii) enter into agreements that restrict distributions from restricted subsidiaries; (iv) sell or otherwise dispose of assets; (v) enter into transactions with affiliates; (vi) create or incur liens; merge, consolidate or sell all or substantially all of the Company’s assets; (vii) place restrictions on the ability of subsidiaries to pay dividends or make other payments to the Company; and (viii) designate the Company’s subsidiaries as unrestricted subsidiaries. These covenants are subject to a number of important exceptions and qualifications. 2016 Credit Agreement due 2022 On February 16, 2016, we entered into the 2016 Credit Agreement due 2022, among us, the lending institutions identified in the 2016 Credit Agreement due 2022, and Truist Financial Corporation (formerly known as SunTrust Bank), as Administrative Agent and Collateral Agent. The 2016 Credit Agreement due 2022 establishes senior secured credit facilities in an aggregate amount of $310.0 million, consisting of a $270.0 million Term B term loan facility originally maturing in February 2022 that amortizes on a basis of 1% annually during its six-year On March 16, 2018, we entered into an amendment of our 2016 Credit Agreement due 2022 (the “Second Amendment”). The Second Amendment, among other things, decreases the applicable interest rate margins for the Initial Term Loans (as defined in the 2016 Credit Agreement due 2022) from (i) 3.75% to 2.50%, in the case of the Base Rate Loans (as defined in the 2016 Credit Agreement due 2022), and (ii) 4.75% to 3.50%, in the case of the Eurodollar Loans (as defined in the 2016 Credit Agreement due 2022). On February 17, 2017, we entered into the first amendment to our 2016 Credit Agreement due 2022, which also resulted in decreases in the applicable margins, but which, unlike the Second Amendment, did not include any changes in lender positions. On October 31, 2019, we entered into an amendment of our 2016 Credit Agreement due 2022 (“Third Amendment”). The Third Amendment provides for, among other things, (i) a three-year $64.0 five-year Pursuant to the Third Amendment, interest on all loans under the 2016 Credit Agreement is payable either quarterly or at the expiration of any LIBOR interest period applicable thereto. The Third Amendment decreases the applicable interest rate margins for the Initial Term Loan A from (i) 2.50% to a spread of 1.00% to 1.75% based on our first lien net leverage ratio, in the case of the Base Rate Loans (with a floor of 100 basis points), and (ii) 3.50% to a spread ranging from 2.00% to 2.75% based on our first lien leverage ratio, in the case of the Eurodollar Loans (with a floor of zero basis points). Also, in connection with the Third Amendment, we will pay quarterly fees on the unused portion of the revolving credit facility equal to a percentage spread (ranging from 0.25% to 0.35%) based on our first lien net leverage ratio. The Third Amendment also modifies the springing financial covenant under the 2016 Credit Agreement to provide that such financial covenant will not be tested until the Initial Term A Loan is paid in full. As of April 3, 2021, there were $5.8 mill $74.2 Fees and costs relating to the Third Amendment were $0.9 $1.5 $10.0 $54.0 $16 The weighted average all-in interest rate for borrowings under the term-loan portion of the 2016 Credit Agreement due 2022 was 2.14% 2.15% Pursuant to the Third Amendment, the 2016 Credit Agreement due 2022 contains a springing financial covenant that would apply if we draw in excess of thirty-five percent (35%) of the revolving facility commitment (excluding $7.5 million of undrawn letters of credit and letters of credit and draws thereunder that are cash collateralized at 103% of the stated amount thereof from such availability test). To the extent in effect, the springing financial covenant would prohibit us from exceeding a maximum first lien net leverage ratio (based on the ratio of total first lien (less unrestricted cash) debt to EBITDA) as of the last day of each applicable fiscal quarter. To the extent the springing financial covenant is in effect, the first lien net leverage ratio currently cannot exceed 4.00:1.00 (4.50:1.00 during a significant acquisition period, as defined, which we are in as of April 3, 2021). We have not been required to test our first lien net leverage ratio because we have not exceeded 35% of our revolving capacity. The 2016 Credit Agreement due 2022 also contains a number of affirmative and restrictive covenants, including limitations on the incurrence of additional debt, liens on property, acquisitions and investments, loans and guarantees, mergers, consolidations, liquidations and dissolutions, asset sales, dividends and other payments in respect of our capital stock, entry into restrictive agreements, prepayments of certain debt and transactions with affiliates, in each case, subject to exceptions and qualifications. The 2016 Credit Agreement due 2022 also contains customary events of default. Upon the occurrence of an event of default, the amounts outstanding under the 2016 Credit Agreement due 2022 may be accelerated and may become immediately due and payable. Deferred Financing Costs The activity relating to third-party fees and costs, lender fees, discount and premiums for the three months ended April 3, 2021, are as follows. All debt-related fees, costs, discount and premiums are classified as a reduction of the carrying value of long-term debt: (in thousands) Total At beginning of year $ 6,902 Add: Deferred financing costs from the issuance of Second Additional Senior Notes 1,363 Less: Premium on the Second Additional Senior Notes (3,300 ) Less: Amortization expense (230 ) At end of period $ 4,735 Estimated amortization expense relating to third-party fees and costs, lender fees, discount and premiums for the years indicated as of April 3, 2021, is as follows: (in thousands) Total Remainder of 2021 $ 657 2022 905 2023 844 2024 889 2025 861 Thereafter 579 Total $ 4,735 As a result of prepayments of the 2016 Credit Agreement due 2022 totaling $214.0 (in thousands) Remainder of 2021 $ — 2022 54,000 2023 — 2024 — 2025 — Thereafter 425,000 Total $ 479,000

Leases

Leases	3 Months Ended
	Apr. 03, 2021
Leases [Abstract]
Leases	NOTE 10. LEASES We lease certain of our manufacturing facilities under operating leases. We also lease production equipment, vehicles, computer equipment, storage units and office equipment under operating leases. Our leases have remaining lease terms of 1 year to 9 years, some of which may include options to extend the leases for up to 5 years, and some of which may include options to terminate the leases within 1 year. All of our leases are operating leases. We did not recognize right-of-use assets or lease liabilities for certain short-term leases that are month-to-month leases. The lease expense relating to these leases is not significant. The components of lease expense for the three months ended April 3, 2021 and April 4, 2020, are as follows. Certain amounts in the prior year period have been reclassified to conform to the current presentation (in thousands): Three Months Ended April 3, April 4, 2021 2020 Operating lease cost $ 2,879 $ 2,104 Variable lease cost 2,200 786 Total lease cost $ 5,079 $ 2,890 Other information relating to leases for the three months ended April 3, 2021 and April 4, 2020, are as follows (in thousands, except years and percentages): Three Months Ended April 3, April 4, 2021 2020 Supplemental cash flows information Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows relating to operating leases $ (2,764 ) $ (2,009 ) Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 29,490 $ 14,605 Weighted average remaining lease term in years Operating leases 7.23 7.27 Weighted average discount rate Operating leases 5.6 % 5.9 % Future maturities under operating leases were as follows at April 3, 2021 and January 2, 2021 (in thousands): April 3, January 2, 2021 2021 Remainder of 2021 $ 9,278 $ 8,327 2022 11,830 7,626 2023 11,557 7,149 2024 11,286 6,748 2025 10,871 6,253 Thereafter 28,847 13,800 Total future minimum lease payments 83,669 49,903 Less: Imputed interest (14,847 ) (8,641 ) Operating lease liability - total $ 68,822 $ 41,262 Reported as of April 3, 2021 and January 2, 2021: Current portion of operating lease liability $ 8,682 $ 6,132 Operating lease liability, less current portion 60,140 35,130 Operating lease liability - total $ 68,822 $ 41,262 As of April 3, 2021, we had no additional operating or finance leases that have not yet commenced. Our operating leases expire at various times through 2030. Lease expense was $5.1 $2.9 $5.1 $2.2 $2.9 $1.5 The $29.5 $27.9

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Apr. 03, 2021
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	NOTE 11. COMMITMENTS AND CONTINGENCIES Legal Proceedings Our Company is a party to various legal proceedings in the ordinary course of business. Although the ultimate disposition of those proceedings cannot be predicted with certainty, management believes the outcome of any claim that is pending or threatened, either individually or in the aggregate, will not have a material adverse effect on our operations, financial position or cash flows.

Income Taxes

Income Taxes	3 Months Ended
	Apr. 03, 2021
Income Tax Disclosure [Abstract]
Income Taxes	NOTE 12. INCOME TAXES Our income tax expense was $3.9 million for the three months ended April 3, 2021, compared with income tax expense of $4.1 million for the three months ended April 4, 2020. Our effective tax rate for the three months ended April 3, 2021, was an expense rate of 23.6%, and was an expense rate of 21.0% for the three months ended April 4, 2020. Our income tax expense for the three months ended April 3, 2021 includes $305 Income tax expense in the three months ended April 3, 2021 included a minor discrete item of income tax benefit. The three months ended April 4, 2020 included excess tax benefits relating to exercises of stock options and lapses of restrictions on stock awards totaling $766 24.1% 24.8% We estimate that our annual effective tax rate for 2021, excluding discrete items, will approximate our current combined statutory federal and state rate of 24.7%. We made no payments of estimated Federal or state income taxes during either of the three-month periods ended April 3, 2021 and April 4, 2020.

Fair Value

Fair Value	3 Months Ended
	Apr. 03, 2021
Fair Value Disclosures [Abstract]
Fair Value	NOTE 13. FAIR VALUE Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. A three-tier fair value hierarchy is used to prioritize the inputs used in measuring fair value. The hierarchy gives the highest priority to unadjusted quoted market prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. A financial instrument’s level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. The three levels of the fair value hierarchy are as follows: Level 1 Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. Level 2 Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. Level 3 Prices or valuations that require inputs that are both significant to the fair value measurement and unobservable. The accounting guidance concerning fair value allows us to elect to measure financial instruments at fair value and report the changes in fair value through earnings. This election can only be made at certain specified dates and is irrevocable once made. We do not have a policy regarding specific assets or liabilities to elect to measure at fair value, but rather we make the election on an instrument-by-instrument basis as they are acquired or incurred. During the three months ended April 3, 2021 or April 4, 2020, we did not make any transfers between Level 2 and Level 3 financial assets. We conduct reviews on a quarterly basis to verify pricing, assess liquidity, and determine if significant inputs have changed that would impact the fair value hierarchy disclosure. Fair Value of Financial Instruments Our financial instruments include cash and cash equivalents, accounts and notes receivable, and accounts payable and accrued liabilities, whose carrying amounts approximate their fair values due to their short-term nature. Our financial instruments also include borrowings under our 2016 Credit Agreement due 2022, as well as the 2018 Senior Notes due 2026, both classified as long-term debt. The fair value of borrowings under the 2016 Credit Agreement due 2022 approximates its carrying value due to its variable-rate nature, and was approximately $54.0 million as of April 3, 2021, compared to a principal outstanding value of $54.0 million, and fair value of $54.0 $54.0 $387.8 $365.0 Items Measured at Fair Value on a Recurring Basis The following are measured in the condensed consolidated financial statements at fair value on a recurring basis and are categorized in the table below based upon the lowest level of significant input to the valuation (in thousands): Fair Value Measurements Assets (Liabilities) Quoted Significant Prices in Other Significant Active Observable Unobservable April 3, Markets Inputs Inputs 2021 (Level 1) (Level 2) (Level 3) Description Aluminum contracts $ 5,885 $ — $ 5,885 $ — MTP contracts 4,239 — 4,239 — $ 10,124 $ — $ 10,124 $ — Fair Value Measurements Assets (Liabilities) Quoted Significant Prices in Other Significant Active Observable Unobservable January 2, Markets Inputs Inputs 2021 (Level 1) (Level 2) (Level 3) Description Aluminum contracts $ 3,190 $ — $ 3,190 $ — MTP contracts 421 — 421 — $ 3,611 $ — $ 3,611 $ — See Note 14 for a description of the methods and assumptions used in the determination of the fair values of our aluminum forward and Midwest Transaction Premium (“MTP”) contracts, as well as the basis for classifying these assets and liabilities as Level 2.

Derivatives

Derivatives	3 Months Ended
	Apr. 03, 2021
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivatives	NOTE 14. DERIVATIVES Aluminum Contracts and Midwest Transaction Premium We enter into aluminum forward contracts to hedge the fluctuations in the purchase price of aluminum extrusion we use in production. Beginning late in the first quarter of 2020, we began entering into forward contracts to hedge the fluctuations in the price of the delivery component of our aluminum extrusion purchases, known as the Midwest Transaction Premium, or MTP. Our contracts are designated as cash flow hedges since they are highly effective in offsetting changes in the cash flows attributable to forecasted purchases of aluminum and the related MTP. We record our aluminium hedge contracts at fair value, based on trading values for aluminum forward contracts. Aluminum forward contracts identical to those held by us trade on the London Metal Exchange (“LME”). The LME provides a transparent forum and is the world’s largest center for the trading of futures contracts for non-ferrous metals. The prices are used by the metals industry worldwide as the basis for contracts for the movement of physical material throughout the production cycle. Based on this high degree of volume and liquidity in the LME, we believe the valuation price at any measurement date for contracts with identical terms as to prompt date, trade date and trade price as those we hold at any time represents a contract’s exit price to be used for purposes of determining fair value. We record our MTP hedge contracts at fair value based on the Platts MW US Transaction price per pound assessment, which has been a benchmark for decades in the North American aluminium industry. Platts surveys the North American market daily to capture trades, bids and offers on a delivered Midwest basis. Data is normalized to reflect the typical price per pound between the largest number of market participants, for delivery within 7 to 30 days from date of publication, net-30-day payment terms, for typical order quantities, chemistries and freight allowances. The survey is extensive and encompasses both domestic and offshore producers, traders and brokers that are varied in scope. Based on the extensive nature of this pricing mechanism, we believe the Platts MW US Transaction price at any time represents a contract’s exit price to be used for purposes of determining fair value. Guidance under the Financial Instruments Topic 825 of the Codification requires us to record our hedge contracts at fair value and consider our credit risk for contracts in a liability position, and our counter-party’s credit risk for contracts in an asset position, in determining fair value. We assess our counter-party’s risk of non-performance when measuring the fair value of financial instruments in an asset position by evaluating their financial position, including cash on hand, as well as their credit ratings. We assess our risk of non-performance when measuring the fair value of our financial instruments in a liability position by evaluating our credit ratings, our current liquidity including cash on hand and availability under our revolving credit facility as compared to the maturities of the financial liabilities. We do not offset the estimated fair value amounts recognized for derivatives executed with the same counterparty under the same master netting arrangement. At April 3, 2021, the fair value of our aluminum forward contracts was in a asset position of $5.9 million. We had 25 33.7 $0.84 one fifteen $4.2 29 56.1 $0.12 one twenty-one We assess the effectiveness of our aluminum forward and MTP contracts by comparing the change in the fair value of the forward contract to the change in the expected cash to be paid for the hedged item. The effective portion of the gain or loss on our aluminum forward contracts is reported as a component of accumulated other comprehensive income (loss) and is reclassified into earnings in the same line item in the income statement as the hedged item in the same period or periods during which the transaction affects earnings. The amount of income, net, recognized in the “accumulated other comprehensive income (loss)” line item in the accompanying condensed consolidated balance sheet as of April 3, 2021, that we expect will be reclassified to earnings within the next twelve months, is approximately $8.7 million. The fair values of our aluminum hedges and MTP contracts are classified in the accompanying condensed consolidated balance sheets at April 3, 2021 and January 2, 2021, as follows (in thousands): Derivative Assets Derivative Liabilities April 3, 2021 April 3, 2021 Derivatives designated as hedging instruments under Subtopic 815-20: Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivative instruments: Aluminum contracts Other current assets $ 5,714 Accrued liabilities $ — MTP contracts Other current assets 3,010 Accrued liabilities — Aluminum contracts Other assets 171 Other liabilities — MTP contracts Other assets 1,229 Other liabilities — Total derivative instruments Total derivative assets $ 10,124 Total derivative liabilities $ — Derivative Assets Derivative Liabilities January 2, 2021 January 2, 2021 Derivatives designated as hedging instruments under Subtopic 815-20: Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivative instruments: Aluminum contracts Other current assets $ 3,243 Accrued liabilities $ (28 ) MTP contracts Other current assets 423 Accrued liabilities (24 ) Aluminum contracts Other assets — Other liabilities (25 ) MTP contracts Other assets 26 Other liabilities (4 ) Total derivative instruments Total derivative assets $ 3,692 Total derivative liabilities $ (81 ) The ending accumulated balance for the aluminum forward and MTP contracts included in accumulated other comprehensive income (losses), net of tax, was an accumulated other comprehensive income of $7.6 $2.7 The following represents the gains (losses) on derivative financial instruments, and their classifications within the accompanying condensed consolidated financial statements, for the three months ended April 3, 2021 and April 4, 2020 (in thousands): Derivatives in Cash Flow Hedging Relationships Amount of Gain or (Loss) Recognized in OCI(L) on Derivatives Location of Gain or (Loss) Reclassified from Accumulated OCI(L) into Income Amount of Gain or (Loss) Reclassified from Accumulated OCI(L) into Income Three Months Ended Three Months Ended April 3, April 4, April 3, April 4, 2021 2020 2021 2020 Aluminum contracts $ 4,083 $ (5,160 ) Cost of sales $ 1,388 $ (612 ) MTP contracts $ 4,205 $ (53 ) Cost of sales $ 387 $ —

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	3 Months Ended
	Apr. 03, 2021
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	NOTE 15. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) The following table shows the components of accumulated other comprehensive income (loss) for the three months ended April 3, 2021 and April 4, 2020 (in thousands): Three months ended April 3, 2021 Aluminum MTP (in thousands) Contracts Contracts Total Balance at January 2, 2021 $ 2,403 $ 317 $ 2,720 Change in fair value of derivatives 4,083 4,205 8,288 Amounts reclassified from other comprehensive loss (1,388 ) (387 ) (1,775 ) Tax effect (670 ) (948 ) (1,618 ) Net current-period other comprehensive income 2,025 2,870 4,895 Balance at April 3, 2021 $ 4,428 $ 3,187 $ 7,615 Three months ended April 4, 2020 Aluminum MTP (in thousands) Contracts Contracts Total Balance at December 28, 2019 $ (238 ) $ - $ (238 ) Change in fair value of derivatives (5,160 ) (53 ) (5,213 ) Amounts reclassified from other comprehensive loss 612 — 612 Tax effect 1,138 13 1,151 Net current-period other comprehensive income (3,410 ) (40 ) (3,450 ) Balance at April 4, 2020 $ (3,648 ) $ (40 ) $ (3,688 )

Segments

Segments	3 Months Ended
	Apr. 03, 2021
Segment Reporting [Abstract]
Segments	NOTE 16. SEGMENTS We have two reportable segments: the Southeast segment and the Western segment. The Southeast reporting segment, which is also an operating segment, is composed of sales from our facilities in Florida, including the net sales of our recent investment in Eco. The Western reporting segment, also an operating segment. Results of the Western segment are composed of the results of WWS. Centralized financial and operational oversight, including resource allocation and assessment of performance on an income (loss) from operations basis, is performed by our CEO, whom we have determined to be our chief operating decision maker (“CODM”), with oversight by the Board of Directors. Total asset information by segment is not included herein as asset information by segment is not presented to or reviewed by the CODM. The following table represents summary financial data attributable to our operating segments for the three months ended April 3, 2021 and April 4, 2020 (in thousands): Three Months Ended April 3, April 4, 2021 2020 Net sales: Southeast segment $ 233,638 $ 183,641 Western segment 37,454 36,563 Total net sales $ 271,092 $ 220,204 Income from operations: Southeast segment $ 18,743 $ 25,821 Western segment 5,453 1,086 Total income from operations 24,196 26,907 Interest expense, net 7,457 7,169 Total income before income taxes $ 16,739 $ 19,738

Reedemable Non-Controlling Inte

Reedemable Non-Controlling Interest	3 Months Ended
	Apr. 03, 2021
Noncontrolling Interest [Abstract]
Reedemable Non-Controlling Interest	NOTE 17. REEDEMABLE NON-CONTROLLING INTEREST On February 1, 2021, we completed an acquisition of a 75% 25% The agreement between PGT Innovations, Inc. and the seller provides the Company with a call right for seller’s equity interest which the Company may exercise during the three-years The Company calculates the redemption value of the non-controlling interest on a quarterly basis using a 10-multiple of TTM EBITDA as determined in accordance with the agreement as described above. After giving effect to the change from the net income (loss) attributable to the redeemable non-controlling interest, the redeemable non-controlling interest is adjusted to be reported at its currently calculated redemption value. Any resulting change in the redemption value of the redeemable non-controlling interest is offset against retained earnings and impacts earnings used in the calculation of earnings per share attributable to common shareholders. For the three months ended April 3, 2021, based on the formula for determining the value of the seller’s put option in the operating agreement governing this transaction, the redemption value of the redeemable non-controlling interest was estimated to be less than $34.5 The following table presents the changes in the Company’s redeemable non-controlling interest for the period presented: Three Months Ended April 3, (in thousands) 2021 Balance at beginning of period $ — Redeemable non-controlling interest in Eco at initially estimated fair value 34,084 Net income attributable to redeemable non-controlling interest 411 Change in value of redeemable non-controlling interest — Balance at end of period $ 34,495

Description of Business and B_2

Description of Business and Basis of Presentation (Policies)	3 Months Ended
	Apr. 03, 2021
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation These condensed consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and do not include all the information and footnotes required by United States Generally Accepted Accounting Principles (“GAAP”) for complete financial statements. In the opinion of management, all adjustments (consisting only of normal recurring adjustments) considered necessary for a fair presentation have been included. Operating results for the interim period are not necessarily indicative of the results that may be expected for the remainder of the current year or for any future periods. The Company’s fiscal first quarter in 2021 ended April 3, 2021, consisted of 13 weeks, and our fiscal first quarter in 2020 ended April 4, 2020, consisted of 14 weeks. The condensed consolidated balance sheet as of January 2, 2021, is derived from the audited consolidated financial statements, but does not include all disclosures required by GAAP. The condensed consolidated balance sheet as of January 2, 2021, and the unaudited condensed consolidated financial statements as of and for the periods ended April 3, 2021 and April 4, 2020, should be read in conjunction with the more detailed audited consolidated financial statements for the year ended January 2, 2021, included in the Company’s most recent Annual Report on Form 10-K. The accounting policies used in the preparation of these unaudited condensed consolidated financial statements are consistent with the accounting policies described in the Notes to Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K. The preparation of financial statements in conformity with GAAP requires management 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, and the reported amounts of revenues and expenses during the reporting period. Actual results could materially differ from those estimates. As described above, the extent to which the COVID-19 pandemic and resulting measures that may be taken by the Company and/or its customers or suppliers and/or by governmental entities will impact the Company's business will depend on future developments, which are highly uncertain and cannot be precisely predicted at this time. Management's estimates and assumptions are highly dependent on estimates of future developments and may change significantly in the future due to unforeseen direct and indirect impacts of the COVID-19 pandemic. We have two reportable segments: the Southeast segment and the Western segment. The Southeast reporting segment, which is also an operating segment, is composed of sales from our facilities in Florida. The Western reporting segment, also an operating segment, is composed of sales from our facility in Arizona. See Note 16 for segment disclosures.
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements Accounting for Income Taxes In December 2019, the FASB issued ASU 2019-12, “Simplifying the Accounting for Income Taxes.” ASU 2019-12 simplifies the accounting for income taxes by removing certain exceptions to the general principles and also clarifies and amends existing guidance. This standard is effective beginning January 1, 2021, with early adoption permitted. The adoption of this standard did not have any impact on our consolidated financial statements. Recently Issued Accounting Pronouncements Reference Rate Reform In March 2020, the FASB issued ASU 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting” and in March 2021, subsequent amendment to the initial guidance, ASU 2021-01, “Reference Rate Reform (Topic 848): Scope” (collectively, “Topic 848”). Topic 848 provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The amendments apply only to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. The guidance generally can be applied from March 12, 2020 through December 31, 2022. We are currently assessing the impacts of the practical expedients provided in Topic 848 and which, if any, we will adopt.
Revenue Recognition Accounting Policy	Revenue Recognition Accounting Policy The Company primarily manufactures fully customized windows and doors based on design specifications, measurements, colors, finishes, framing materials, glass-types, and other options selected by the customer at the point in time an order is received. The Company has an enforceable right to payment at the time an order is received and accepted at the agreed-upon sales prices contained in our agreements with our customers for all manufacturing efforts expended on behalf of its customers. Due to the customized build-to-order nature of these products, the Company’s assessment is that the substantial portion of its finished goods and certain unused glass components have no alternative use, and that control of these products and components passes to the customer over time during the manufacturing of the products in an order, or upon our receipt of certain pre-cut glass components from our supplier attributed to specific customer orders. Based on these factors, the Company recognizes a substantial portion of revenue over time during the manufacturing process once customization begins, and for certain unused glass components on hand, at the end of a reporting period. Revenue on work-in-process at the end of a reporting period is recognized in proportion to costs incurred to total estimated cost of the product being manufactured. Except for the Western segment’s volume products, discussed in the section titled Disaggregation of Revenue from Contracts with Customers below, revenue recognized at a point in time is immaterial.
Shipping and Handling Cost and Commissions on Contract Assets	Policies Regarding Shipping and Handling Costs and Commissions on Contract Assets The Company has made a policy election to continue to recognize shipping and handling costs as a fulfillment activity. Treating shipping and handling as a fulfillment activity requires estimated shipping and handling costs for undelivered products and certain glass components on which we have recognized revenue and created a contract asset, to be accrued to match this cost with the recognized revenue. Sales taxes collected from customers are recorded on a net basis. The Company utilizes the practical expedient which permits expensing of costs to obtain a contract when the expected amortization period is one year or less, which typically results in expensing commissions paid to employees. We expense sales commissions paid to employees as sales are recognized, including sales from the creation of contract assets, as the expected amortization period is less than one year.

Revenue Recognition and Contr_2

Revenue Recognition and Contracts with Customers (Tables)	3 Months Ended
	Apr. 03, 2021
Revenue From Contract With Customer [Abstract]
Net Sales by Reporting Segment, Product Category and Market	The following tables provide information about our net sales by reporting segment, product category and market for the three months ended April 3, 2021 and April 4, 2020 (dollars in millions): Three Months Ended April 3, April 4, Disaggregation of revenue (in millions) : 2021 2020 Reporting segment: Southeast $ 233.6 $ 183.6 Western 37.5 36.6 Total net sales $ 271.1 $ 220.2 Product category: Impact-resistant window and door products $ 191.4 $ 153.6 Non-impact window and door products 79.7 66.6 Total net sales $ 271.1 $ 220.2 Market: New construction $ 120.0 $ 109.1 Repair and remodel 151.1 111.1 Total net sales $ 271.1 $ 220.2

Warranty (Tables)

Warranty (Tables)	3 Months Ended
	Apr. 03, 2021
Guarantees And Product Warranties [Abstract]
Summary of Current Period Charges, Adjustments to Previous Estimates, Settlements representing Actual Costs Incurred with regard to Accrued Warranty	The following table summarizes current period charges, adjustments to previous estimates, if necessary, as well as settlements, which represent actual costs incurred during the period for the three months ended April 3, 2021 and April 4, 2020. Beginning Acquisition- Charged End of Accrued Warranty of Period Related to Expense Adjustments Settlements Period (in thousands) Three months ended April 3, 2021 $ 8,001 $ — $ 6,966 $ 389 $ (5,713 ) $ 9,643 Three months ended April 4, 2020 $ 6,244 $ 1,592 $ 3,841 $ (20 ) $ (4,269 ) $ 7,388

Inventories (Tables)

Inventories (Tables)	3 Months Ended
	Apr. 03, 2021
Inventory Disclosure [Abstract]
Summary of Inventories	Inventories consisted of the following: April 3, January 2, 2021 2021 (in thousands) Raw materials $ 66,179 $ 55,916 Work-in-progress 5,718 4,058 Finished goods 455 343 $ 72,352 $ 60,317

Acquisitions (Tables)

Acquisitions (Tables)	3 Months Ended
	Apr. 03, 2021
ECO [Member]
Business Acquisition [Line Items]
Schedule of Fair Value of Assets and Liabilities Assumed	The estimated fair value of assets acquired, and liabilities assumed as of the closing date, are as follows: Preliminary Allocation Accounts receivable $ 5,031 Inventories 7,728 Contract assets, net 4,312 Prepaid expenses and other assets 1,706 Property and equipment 24,009 Operating lease right-of-use asset 27,864 Intangible assets 72,700 Goodwill 30,051 Total assets acquired 173,401 Accounts payable (6,809 ) Accrued and other liabilities, including customer deposits (4,215 ) Operating lease liability (27,864 ) Total liabilities assumed (38,888 ) Net assets acquired 134,513 Redeemable non-controlling interest (34,084 ) Fair value of consideration transferred $ 100,429 Consideration: Cash $ 94,321 PGTI common stock 6,108 Fair value of consideration transferred $ 100,429
Schedule for Valuation of Identifiable Intangible Assets Acquired and Estimate of Useful Lives	The valuation of the identifiable intangible assets acquired in the Eco Acquisition and our estimate of their respective useful lives are as follows: Initial Preliminary Useful Life Valuation (in years) (in thousands) Trade name $ 36,000 indefinite Customer relationships 36,700 5 - 15 Intangible assets, net $ 72,700
Summary of Unaudited Proforma Results	The unaudited pro forma results do not include the impact of synergies, nor any potential impacts on current or future market conditions which could alter the following unaudited pro forma results. Three Months Ended April 3, April 4, 2021 2020 (unaudited) Net sales $ 279,044 $ 231,353 Net income attributable to PGTI stockholders: $ 12,542 $ 15,297 Net income per common share attributable to PGTI stockholders: Basic $ 0.21 $ 0.26 Diluted $ 0.21 $ 0.26
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member]
Business Acquisition [Line Items]
Schedule of Fair Value of Assets and Liabilities Assumed	The estimated fair value of assets acquired, and liabilities assumed as of the closing date, were as follows: Final Allocation Accounts receivable $ 8,434 Inventories 2,936 Contract assets, net 4,413 Prepaid expenses and other assets 1,756 Property and equipment 7,433 Operating lease right-of-use asset 10,578 Intangible assets 27,370 Goodwill 52,094 Accounts payable (6,621 ) Accrued and other liabilities (7,447 ) Operating lease liability (10,578 ) Purchase price $ 90,368 Consideration: Cash $ 90,368 Total fair value of consideration $ 90,368
Schedule for Valuation of Identifiable Intangible Assets Acquired and Estimate of Useful Lives	The valuation of the identifiable intangible assets acquired in the NewSouth Acquisition and our estimate of their respective useful lives are as follows: Initial Final Useful Life Valuation (in years) (in thousands) Trade name $ 22,200 15 Non-compete agreements 1,670 5 Developed technology 2,600 6 Customer-related intangible 900 <1 Intangible assets, net $ 27,370
Summary of Unaudited Proforma Results	The unaudited pro forma results do not include the impact of synergies, nor any potential impacts on current or future market conditions which could alter the following unaudited pro forma results. Three Months Ended April 4, 2020 (unaudited) Net sales 227,956 Net income 15,830 Net income per common share: Basic $ 0.27 Diluted $ 0.27

Net Income Per Common Share (Ta

Net Income Per Common Share (Tables)	3 Months Ended
	Apr. 03, 2021
Earnings Per Share [Abstract]
Calculation of EPS and Reconciliation of Weighted Average Common Shares Used in Calculation of Basic and Diluted EPS	The table below presents the calculation of EPS and a reconciliation of weighted average common shares used in the calculation of basic and diluted EPS : Three Months Ended April 3, April 4, 2021 2020 (in thousands, except per share amounts) Net income $ 12,795 $ 15,600 Less: Net income attributable to redeemable non-controlling interest 411 — Net income attributable to the Company 12,384 15,600 Change in redemption value of redeemable non-controlling interest — — Net income attributable to common shareholders $ 12,384 $ 15,600 Weighted-average common shares - Basic 59,286 58,668 Add: Dilutive shares from equity plans 608 453 Weighted-average common shares - Diluted 59,894 59,121 Net income per common share attributable to common shareholders: Basic $ 0.21 $ 0.27 Diluted $ 0.21 $ 0.26

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Apr. 03, 2021
Goodwill And Intangible Assets Disclosure [Abstract]
Schedule of Goodwill and Intangible Assets Net	Goodwill and intangible assets are as follows: Initial April 3, January 2, Useful Life 2021 2021 (in years) (in thousands) Goodwill $ 359,746 $ 329,695 indefinite Other intangible assets: Trade names (indefinite-lived) $ 176,841 $ 140,841 indefinite Customer relationships and customer-related assets 238,247 201,547 <1-15 Trade name (amortizable) 22,200 22,200 15 Developed technology 5,600 5,600 6-10 Non-compete agreement 3,338 3,338 2-5 Software license 590 590 2 Less: Accumulated amortization (122,358 ) (117,609 ) Subtotal 147,617 115,666 Other intangible assets, net $ 324,458 $ 256,507 Goodwill at January 2, 2021 $ 329,695 Increase in goodwill from our investment in Eco 30,051 Goodwill at April 3, 2021 $ 359,746 Trade names at January 2, 2021 $ 140,841 Increase in trade names from our investment in Eco 36,000 Trade names at April 3, 2021 $ 176,841
Estimated Amortization for Future Fiscal Year	Estimated amortization of our amortizable intangible assets for future years is as follows: (in thousands) Total Remainder of 2021 $ 15,247 2022 19,342 2023 17,181 2024 17,135 2025 16,896 Thereafter 61,816 Total $ 147,617

Long-Term Debt (Tables)

Long-Term Debt (Tables)	3 Months Ended
	Apr. 03, 2021
Debt Disclosure [Abstract]
Schedule of Long-term Debt	April 3, January 2, 2021 2021 (in thousands) 2018 Senior Notes due 2026, maturing in August 2026 $ 425,000 $ 365,000 2016 Credit Agreement due 2022, maturing in October 2022 54,000 54,000 Long-term debt 479,000 419,000 Fees, costs, discount and premium (4,735 ) (6,902 ) Long-term debt, net $ 474,265 $ 412,098
Activity Relating to Third-Party Fees and Costs, Lender Fees, Discount and Premiums	The activity relating to third-party fees and costs, lender fees, discount and premiums for the three months ended April 3, 2021, are as follows. All debt-related fees, costs, discount and premiums are classified as a reduction of the carrying value of long-term debt: (in thousands) Total At beginning of year $ 6,902 Add: Deferred financing costs from the issuance of Second Additional Senior Notes 1,363 Less: Premium on the Second Additional Senior Notes (3,300 ) Less: Amortization expense (230 ) At end of period $ 4,735
Estimated Amortization Expense Relating to Third-Party Fees and Costs, Lender Fees, Discount and Premiums	Estimated amortization expense relating to third-party fees and costs, lender fees, discount and premiums for the years indicated as of April 3, 2021, is as follows: (in thousands) Total Remainder of 2021 $ 657 2022 905 2023 844 2024 889 2025 861 Thereafter 579 Total $ 4,735
Contractual Future Maturities of Long-Term Debt Outstanding	As a result of prepayments of the 2016 Credit Agreement due 2022 totaling $214.0 (in thousands) Remainder of 2021 $ — 2022 54,000 2023 — 2024 — 2025 — Thereafter 425,000 Total $ 479,000

Leases (Tables)

Leases (Tables)	3 Months Ended
	Apr. 03, 2021
Leases [Abstract]
Components of Lease Expense	The components of lease expense for the three months ended April 3, 2021 and April 4, 2020, are as follows. Certain amounts in the prior year period have been reclassified to conform to the current presentation (in thousands): Three Months Ended April 3, April 4, 2021 2020 Operating lease cost $ 2,879 $ 2,104 Variable lease cost 2,200 786 Total lease cost $ 5,079 $ 2,890
Other Information Relating to Leases	Other information relating to leases for the three months ended April 3, 2021 and April 4, 2020, are as follows (in thousands, except years and percentages): Three Months Ended April 3, April 4, 2021 2020 Supplemental cash flows information Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows relating to operating leases $ (2,764 ) $ (2,009 ) Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 29,490 $ 14,605 Weighted average remaining lease term in years Operating leases 7.23 7.27 Weighted average discount rate Operating leases 5.6 % 5.9 %
Future Maturities under Operating Leases	Future maturities under operating leases were as follows at April 3, 2021 and January 2, 2021 (in thousands): April 3, January 2, 2021 2021 Remainder of 2021 $ 9,278 $ 8,327 2022 11,830 7,626 2023 11,557 7,149 2024 11,286 6,748 2025 10,871 6,253 Thereafter 28,847 13,800 Total future minimum lease payments 83,669 49,903 Less: Imputed interest (14,847 ) (8,641 ) Operating lease liability - total $ 68,822 $ 41,262 Reported as of April 3, 2021 and January 2, 2021: Current portion of operating lease liability $ 8,682 $ 6,132 Operating lease liability, less current portion 60,140 35,130 Operating lease liability - total $ 68,822 $ 41,262

Fair Value (Tables)

Fair Value (Tables)	3 Months Ended
	Apr. 03, 2021
Fair Value Disclosures [Abstract]
Schedule of Fair Value on Recurring Basis	The following are measured in the condensed consolidated financial statements at fair value on a recurring basis and are categorized in the table below based upon the lowest level of significant input to the valuation (in thousands): Fair Value Measurements Assets (Liabilities) Quoted Significant Prices in Other Significant Active Observable Unobservable April 3, Markets Inputs Inputs 2021 (Level 1) (Level 2) (Level 3) Description Aluminum contracts $ 5,885 $ — $ 5,885 $ — MTP contracts 4,239 — 4,239 — $ 10,124 $ — $ 10,124 $ — Fair Value Measurements Assets (Liabilities) Quoted Significant Prices in Other Significant Active Observable Unobservable January 2, Markets Inputs Inputs 2021 (Level 1) (Level 2) (Level 3) Description Aluminum contracts $ 3,190 $ — $ 3,190 $ — MTP contracts 421 — 421 — $ 3,611 $ — $ 3,611 $ —

Derivatives (Tables)

Derivatives (Tables)	3 Months Ended
	Apr. 03, 2021
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Summary of Fair Values of Hedges and MTP Contracts	The fair values of our aluminum hedges and MTP contracts are classified in the accompanying condensed consolidated balance sheets at April 3, 2021 and January 2, 2021, as follows (in thousands): Derivative Assets Derivative Liabilities April 3, 2021 April 3, 2021 Derivatives designated as hedging instruments under Subtopic 815-20: Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivative instruments: Aluminum contracts Other current assets $ 5,714 Accrued liabilities $ — MTP contracts Other current assets 3,010 Accrued liabilities — Aluminum contracts Other assets 171 Other liabilities — MTP contracts Other assets 1,229 Other liabilities — Total derivative instruments Total derivative assets $ 10,124 Total derivative liabilities $ — Derivative Assets Derivative Liabilities January 2, 2021 January 2, 2021 Derivatives designated as hedging instruments under Subtopic 815-20: Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivative instruments: Aluminum contracts Other current assets $ 3,243 Accrued liabilities $ (28 ) MTP contracts Other current assets 423 Accrued liabilities (24 ) Aluminum contracts Other assets — Other liabilities (25 ) MTP contracts Other assets 26 Other liabilities (4 ) Total derivative instruments Total derivative assets $ 3,692 Total derivative liabilities $ (81 )
Gains (Losses) on Derivative Financial Instruments	The following represents the gains (losses) on derivative financial instruments, and their classifications within the accompanying condensed consolidated financial statements, for the three months ended April 3, 2021 and April 4, 2020 (in thousands): Derivatives in Cash Flow Hedging Relationships Amount of Gain or (Loss) Recognized in OCI(L) on Derivatives Location of Gain or (Loss) Reclassified from Accumulated OCI(L) into Income Amount of Gain or (Loss) Reclassified from Accumulated OCI(L) into Income Three Months Ended Three Months Ended April 3, April 4, April 3, April 4, 2021 2020 2021 2020 Aluminum contracts $ 4,083 $ (5,160 ) Cost of sales $ 1,388 $ (612 ) MTP contracts $ 4,205 $ (53 ) Cost of sales $ 387 $ —

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Apr. 03, 2021
Equity [Abstract]
Components of Accumulated Other Comprehensive Income (Loss)	The following table shows the components of accumulated other comprehensive income (loss) for the three months ended April 3, 2021 and April 4, 2020 (in thousands): Three months ended April 3, 2021 Aluminum MTP (in thousands) Contracts Contracts Total Balance at January 2, 2021 $ 2,403 $ 317 $ 2,720 Change in fair value of derivatives 4,083 4,205 8,288 Amounts reclassified from other comprehensive loss (1,388 ) (387 ) (1,775 ) Tax effect (670 ) (948 ) (1,618 ) Net current-period other comprehensive income 2,025 2,870 4,895 Balance at April 3, 2021 $ 4,428 $ 3,187 $ 7,615 Three months ended April 4, 2020 Aluminum MTP (in thousands) Contracts Contracts Total Balance at December 28, 2019 $ (238 ) $ - $ (238 ) Change in fair value of derivatives (5,160 ) (53 ) (5,213 ) Amounts reclassified from other comprehensive loss 612 — 612 Tax effect 1,138 13 1,151 Net current-period other comprehensive income (3,410 ) (40 ) (3,450 ) Balance at April 4, 2020 $ (3,648 ) $ (40 ) $ (3,688 )

Segments (Tables)

Segments (Tables)	3 Months Ended
	Apr. 03, 2021
Segment Reporting [Abstract]
Summary of Financial Data Attributable to Operating Segments	The following table represents summary financial data attributable to our operating segments for the three months ended April 3, 2021 and April 4, 2020 (in thousands): Three Months Ended April 3, April 4, 2021 2020 Net sales: Southeast segment $ 233,638 $ 183,641 Western segment 37,454 36,563 Total net sales $ 271,092 $ 220,204 Income from operations: Southeast segment $ 18,743 $ 25,821 Western segment 5,453 1,086 Total income from operations 24,196 26,907 Interest expense, net 7,457 7,169 Total income before income taxes $ 16,739 $ 19,738

Reedemable Non-Controlling In_2

Reedemable Non-Controlling Interest (Tables)	3 Months Ended
	Apr. 03, 2021
Noncontrolling Interest [Abstract]
Summary of Changes in Redeemable Non-Controlling Interest	The following table presents the changes in the Company’s redeemable non-controlling interest for the period presented: Three Months Ended April 3, (in thousands) 2021 Balance at beginning of period $ — Redeemable non-controlling interest in Eco at initially estimated fair value 34,084 Net income attributable to redeemable non-controlling interest 411 Change in value of redeemable non-controlling interest — Balance at end of period $ 34,495

Description of Business and B_3

Description of Business and Basis of Presentation - Additional Information (Detail)	Feb. 01, 2021	Apr. 03, 2021OperationPlantSegment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of reportable segments | Segment		2
Florida [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of manufacturing operations		6
North Venice, Florida [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of manufacturing operations		1
Greater Miami, Florida [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of manufacturing operations		4
Arizona [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of manufacturing operations		1
Tampa [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of manufacturing operations		1
Glass Tempering and Laminating Plant [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of plants | Plant		2
Glass Tempering and Laminating Plant [Member] | North Venice [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of plants | Plant		2
Insulation Glass Plants [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of plants | Plant		1
Insulation Glass Plants [Member] | North Venice [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of plants | Plant		1
ECO [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Business combination, percentage of ownership stake acquired	75.00%	75.00%
Business combination, effective date of acquisition	Feb. 1, 2021
Number of manufacturing operations		2

Revenue Recognition and Contr_3

Revenue Recognition and Contracts with Customers - Additional Information (Detail) $ in Thousands	3 Months Ended
	Apr. 03, 2021USD ($)Segment	Apr. 04, 2020USD ($)	Jan. 02, 2021USD ($)
Disaggregation Of Revenue [Line Items]
Number of reportable segments | Segment	2
Net sales	$ 271,092	$ 220,204
Contract liabilities	34,000		$ 22,800
Contract assets, net	$ 49,225		28,723
Revenue recognition, practical expedient	true
Allowance for doubtful accounts	$ 4,600		3,700
NewSouth Window Solutions [Member]
Disaggregation Of Revenue [Line Items]
Business combination, effective date of acquisition	Feb. 1, 2021
Accrued Liabilities [Member]
Disaggregation Of Revenue [Line Items]
Contract liabilities	$ 27,800		18,100
Reduction to Contract Assets [Member]
Disaggregation Of Revenue [Line Items]
Contract liabilities	6,200		$ 4,600
Western Segment [Member]
Disaggregation Of Revenue [Line Items]
Net sales	37,454	36,563
Western Segment [Member] | Volume Products [Member] | Passes at Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Net sales	$ 19,600	$ 15,200

Revenue Recognition and Contr_4

Revenue Recognition and Contracts with Customers - Net Sales by Reporting Segment, Product Category and Market (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Apr. 04, 2020
Disaggregation Of Revenue [Line Items]
Net sales	$ 271,092	$ 220,204
Southeast Segment [Member]
Disaggregation Of Revenue [Line Items]
Net sales	233,638	183,641
Western Segment [Member]
Disaggregation Of Revenue [Line Items]
Net sales	37,454	36,563
Impact-Resistant Windows and Door Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	191,400	153,600
Non-Impact Window and Door Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	79,700	66,600
New Construction [Member]
Disaggregation Of Revenue [Line Items]
Net sales	120,000	109,100
Repair and Remodel [Member]
Disaggregation Of Revenue [Line Items]
Net sales	$ 151,100	$ 111,100

Warranty - Additional Informati

Warranty - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Apr. 03, 2021	Apr. 04, 2020	Jan. 02, 2021
Product Warranty Liability [Line Items]
Warranty expense, average rate of sales	2.60%	1.70%
Warranty expense rate description	The increase in our warranty expense rate in the first three months of April 3, 2021 compared to April 4, 2020 is a result of costs associated with the wind-down of the commercial business of NewSouth in the three months ended April 3, 2021, which resulted in warranty costs incremental to those we would incur in the normal course of business.
Accrued warranty reserve	$ 9.6		$ 8
Accrued Expenses [Member]
Product Warranty Liability [Line Items]
Accrued warranty reserve	$ 7.8		$ 6.5
Minimum [Member]
Product Warranty Liability [Line Items]
Warranty periods	1 year
Warranty period of the majority of products sold	1 year
Maximum [Member]
Product Warranty Liability [Line Items]
Warranty periods	10 years
Warranty period of the majority of products sold	3 years

Warranty - Summary of Current P

Warranty - Summary of Current Period Charges, Adjustments to Previous Estimates, Settlements representing Actual Costs Incurred with regard to Accrued Warranty (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Apr. 04, 2020
Guarantees And Product Warranties [Abstract]
Accrued Warranty, Beginning of Period	$ 8,001	$ 6,244
Accrued Warranty, Acquired		1,592
Accrued Warranty, Charged to Expense	6,966	3,841
Accrued Warranty, Adjustments	389	(20)
Accrued Warranty, Settlements	(5,713)	(4,269)
Accrued Warranty, End of Period	$ 9,643	$ 7,388

Inventories - Summary of Invent

Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Apr. 03, 2021	Jan. 02, 2021
Inventory Disclosure [Abstract]
Raw materials	$ 66,179	$ 55,916
Work-in-progress	5,718	4,058
Finished goods	455	343
Inventories	$ 72,352	$ 60,317

Stock Based-Compensation - Addi

Stock Based-Compensation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Apr. 04, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense for stock based awards	$ 1,750	$ 1,530
Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense for stock based awards	1,500	$ 1,400
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation	$ 11,200
Weighted-average period	1 year 10 months 24 days

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail) $ / shares in Units, $ in Thousands	Feb. 01, 2021USD ($)Location$ / sharesshares	Jan. 25, 2021USD ($)	Feb. 01, 2020USD ($)	Jan. 24, 2020USD ($)	Aug. 10, 2018	Apr. 03, 2021USD ($)	Jan. 02, 2021USD ($)	Apr. 04, 2020USD ($)	Jan. 02, 2021USD ($)	Dec. 28, 2019USD ($)
Business Acquisition [Line Items]
Aggregate principal amount issuance						$ 479,000	$ 419,000		$ 419,000
Net sales						271,092		$ 220,204
Net income including portion attributable to non-controlling interest						12,795		15,600
Net income portion attributable to redeemable non-controlling interest						411
Goodwill						359,746	329,695		329,695
Southeast Segment [Member]
Business Acquisition [Line Items]
Net sales						233,638		183,641
Goodwill						231,300	201,300		201,300
Common Stock [Member]
Business Acquisition [Line Items]
Business combination, number of shares issuance | shares	357,797
Sale of stock, price per share | $ / shares	$ 21.34
Percentage of discount in sale of stock price per share for lack of marketability	20.00%
2018 Senior Notes due 2026 [Member]
Business Acquisition [Line Items]
Aggregate principal amount issuance		$ 60,000				$ 425,000
Accrued Interest rate		6.75%		6.75%	6.75%
Percentage of principal amount issued		105.50%		106.375%	100.00%
Debt instrument premium		$ 3,300		$ 3,200
ECO [Member]
Business Acquisition [Line Items]
Business combination, effective date of acquisition	Feb. 1, 2021
Business combination, percentage of ownership stake acquired	75.00%					75.00%
Fair value of consideration	$ 100,429	100,400
Cash payment to acquire business	94,321	94,300
Working capital adjustment	5,600
Issue of common stock value to acquire business	$ 6,108
Sale of stock, price per share | $ / shares	$ 21.34
Business combination, value of shares issuance	$ 7,600
Percentage of holder of redeemable non-controlling interest restricted from selling shares from date of acquisition	25.00%
Period of holder of redeemable non-controlling interest restricted from selling shares from date of acquisition	3 years
Percentage of discount in sale of stock price per share for lack of marketability	20.00%
Estimated fair value of redeemable non-controlling interest	$ 34,084
Fair value of acquisition including non-controlling interest	$ 134,513
Percentage of estimated fair value of entity at acquisition date to calculate fair value of redeemable on controlling interest	25.00%
Percentage of estimated discount for lack of sellers voting control in new entity	5.00%
Number of manufacturing location | Location	3
Net sales						$ 16,000
Net income including portion attributable to non-controlling interest						1,600
Net income portion attributable to redeemable non-controlling interest						411
Goodwill	$ 30,051
ECO [Member] | Southeast Segment [Member]
Business Acquisition [Line Items]
Estimated amount of goodwill deductible for tax purposes						30,100
ECO [Member] | Selling, General and Administrative Expenses [Member]
Business Acquisition [Line Items]
Business combination, acquisition related costs	1,700					$ 700	$ 1,000
ECO [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Issue of common stock value to acquire business	$ 6,100
Business combination, number of shares issuance | shares	357,797
ECO [Member] | 2018 Senior Notes due 2026 [Member]
Business Acquisition [Line Items]
Aggregate principal amount issuance	$ 60,000
Accrued Interest rate	6.75%
Percentage of principal amount issued	105.50%
Debt instrument premium	$ 3,300
ECO [Member] | Cash On Hand [Member]
Business Acquisition [Line Items]
Cash payment to acquire business	$ 94,300	$ 31,000
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member]
Business Acquisition [Line Items]
Business combination, effective date of acquisition			Feb. 1, 2020
Fair value of consideration			$ 90,368
Cash payment to acquire business			90,368
Business combination, acquisition related costs			2,400						$ 900	$ 1,500
Goodwill			52,094
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member] | Selling, General and Administrative Expenses [Member]
Business Acquisition [Line Items]
Business combination, acquisition related costs								$ 500
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member] | 2018 Senior Notes due 2026 [Member]
Business Acquisition [Line Items]
Cash payment to acquire business			53,200
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member] | Cash On Hand [Member]
Business Acquisition [Line Items]
Cash payment to acquire business			37,200
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member] | Add-on Issuance [Member] | 2018 Senior Notes due 2026 [Member]
Business Acquisition [Line Items]
Cash payment to acquire business			50,000
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member] | Premium [Member]
Business Acquisition [Line Items]
Cash payment to acquire business			$ 3,200

Acquisitions - Schedule of Fair

Acquisitions - Schedule of Fair Value of Assets and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Feb. 01, 2021	Jan. 25, 2021	Feb. 01, 2020	Apr. 03, 2021	Jan. 02, 2021
Business Acquisition [Line Items]
Goodwill				$ 359,746	$ 329,695
ECO [Member]
Business Acquisition [Line Items]
Accounts receivable	$ 5,031
Inventories	7,728
Contract assets, net	4,312
Prepaid expenses and other assets	1,706
Property and equipment	24,009
Operating lease right-of-use asset	27,864			$ 27,900
Intangible assets	72,700
Goodwill	30,051
Total assets acquired	173,401
Accounts payable	(6,809)
Accrued and other liabilities, including customer deposits	(4,215)
Operating lease liability	(27,864)
Total liabilities assumed	(38,888)
Net assets acquired	134,513
Redeemable non-controlling interest	(34,084)
Fair value of consideration transferred	100,429
Cash	94,321	$ 94,300
PGTI common stock	6,108
Fair value of consideration transferred	$ 100,429	$ 100,400
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member]
Business Acquisition [Line Items]
Accounts receivable			$ 8,434
Inventories			2,936
Contract assets, net			4,413
Prepaid expenses and other assets			1,756
Property and equipment			7,433
Operating lease right-of-use asset			10,578
Intangible assets			27,370
Goodwill			52,094
Accounts payable			(6,621)
Accrued and other liabilities			(7,447)
Operating lease liability			(10,578)
Purchase price			90,368
Cash			90,368
Fair value of consideration transferred			$ 90,368

Acquisitions - Schedule for Val

Acquisitions - Schedule for Valuation of Identifiable Intangible Assets Acquired and Estimate of Useful Lives (Detail) - USD ($) $ in Thousands	Feb. 01, 2021	Feb. 01, 2020
ECO [Member]
Business Acquisition [Line Items]
Preliminary/Final Valuation Amount	$ 72,700
ECO [Member] | Customer Relationships
Business Acquisition [Line Items]
Preliminary/Final Valuation Amount	$ 36,700
ECO [Member] | Customer Relationships | Minimum [Member]
Business Acquisition [Line Items]
Useful Life (in years)	5 years
ECO [Member] | Customer Relationships | Maximum [Member]
Business Acquisition [Line Items]
Useful Life (in years)	15 years
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member]
Business Acquisition [Line Items]
Preliminary/Final Valuation Amount		$ 27,370
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member] | Customer Relationships
Business Acquisition [Line Items]
Preliminary/Final Valuation Amount		$ 900
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member] | Customer Relationships | Maximum [Member]
Business Acquisition [Line Items]
Useful Life (in years)		1 year
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member] | Trade Name [Member]
Business Acquisition [Line Items]
Preliminary/Final Valuation Amount		$ 22,200
Useful Life (in years)		15 years
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member] | Noncompete Agreements [Member]
Business Acquisition [Line Items]
Preliminary/Final Valuation Amount		$ 1,670
Useful Life (in years)		5 years
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member] | Developed Technology [Member]
Business Acquisition [Line Items]
Preliminary/Final Valuation Amount		$ 2,600
Useful Life (in years)		6 years
Trade Name [Member] | ECO [Member]
Business Acquisition [Line Items]
Preliminary or Final Valuation Amount	$ 36,000

Acquisitions - Summary of Unaud

Acquisitions - Summary of Unaudited Proforma Results (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Apr. 03, 2021	Apr. 04, 2020
ECO [Member]
Business Acquisition [Line Items]
Net sales	$ 279,044	$ 231,353
Net income	$ 12,542	$ 15,297
Net income per common share:
Basic	$ 0.21	$ 0.26
Diluted	$ 0.21	$ 0.26
New South Window Solutions LLC and New South Window Solutions of Orlando LLC [Member]
Business Acquisition [Line Items]
Net sales		$ 227,956
Net income		$ 15,830
Net income per common share:
Basic		$ 0.27
Diluted		$ 0.27

Net Income Per Common Share - A

Net Income Per Common Share - Additional Information (Detail) - shares	3 Months Ended
	Apr. 03, 2021	Apr. 04, 2020
Earnings Per Share [Abstract]
Anti-dilutive securities excluded from the calculation of weighted average shares outstanding	0	586,000

Net Income Per Common Share - C

Net Income Per Common Share - Calculation of EPS and Reconciliation of Weighted Average Common Shares Used in Calculation of Basic and Diluted EPS (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 03, 2021	Apr. 04, 2020
Earnings Per Share [Abstract]
Net income	$ 12,795	$ 15,600
Less: Net income attributable to redeemable non-controlling interest	411
Net income attributable to the Company	12,384	15,600
Change in redemption value of redeemable non-controlling interest	0	0
Net income attributable to common shareholders	$ 12,384	$ 15,600
Weighted-average common shares - Basic	59,286	58,668
Add: Dilutive shares from equity plans	608	453
Weighted-average common shares - Diluted	59,894	59,121
Net income per common share attributable to common shareholders:
Basic	$ 0.21	$ 0.27
Diluted	$ 0.21	$ 0.26

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Schedule of Goodwill and Intangible Assets Net (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Jan. 02, 2021
Indefinite-lived Intangible Assets [Line Items]
Less: Accumulated amortization	$ (122,358)	$ (117,609)
Subtotal	147,617	115,666
Other intangible assets, net	324,458	256,507
Goodwill at January 2, 2021	329,695
Goodwill at April 3, 2021	359,746
Eco Enterprises, LLC [Member]
Indefinite-lived Intangible Assets [Line Items]
Increase in goodwill from our investment in Eco	30,051
Trade Name [Member]
Indefinite-lived Intangible Assets [Line Items]
Intangible assets	176,841	140,841
Increase in trade names from our investment in Eco	36,000
Customer Relationships and Customer-related Assets [Member]
Indefinite-lived Intangible Assets [Line Items]
Intangible assets	$ 238,247	201,547
Customer Relationships and Customer-related Assets [Member] | Minimum [Member]
Indefinite-lived Intangible Assets [Line Items]
Initial Useful Life (in years)	1 year
Customer Relationships and Customer-related Assets [Member] | Maximum [Member]
Indefinite-lived Intangible Assets [Line Items]
Initial Useful Life (in years)	15 years
Trade Name [Member]
Indefinite-lived Intangible Assets [Line Items]
Intangible assets	$ 22,200	22,200
Initial Useful Life (in years)	15 years
Developed Technology [Member]
Indefinite-lived Intangible Assets [Line Items]
Intangible assets	$ 5,600	5,600
Developed Technology [Member] | Minimum [Member]
Indefinite-lived Intangible Assets [Line Items]
Initial Useful Life (in years)	6 years
Developed Technology [Member] | Maximum [Member]
Indefinite-lived Intangible Assets [Line Items]
Initial Useful Life (in years)	10 years
Noncompete Agreements [Member]
Indefinite-lived Intangible Assets [Line Items]
Intangible assets	$ 3,338	3,338
Noncompete Agreements [Member] | Minimum [Member]
Indefinite-lived Intangible Assets [Line Items]
Initial Useful Life (in years)	2 years
Noncompete Agreements [Member] | Maximum [Member]
Indefinite-lived Intangible Assets [Line Items]
Initial Useful Life (in years)	5 years
Software License [Member]
Indefinite-lived Intangible Assets [Line Items]
Intangible assets	$ 590	$ 590
Initial Useful Life (in years)	2 years

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Estimated Amortization for Future Fiscal Year (Detail) - USD ($) $ in Thousands	Apr. 03, 2021	Jan. 02, 2021
Goodwill And Intangible Assets Disclosure [Abstract]
Remainder of 2021	$ 15,247
2022	19,342
2023	17,181
2024	17,135
2025	16,896
Thereafter	61,816
Subtotal	$ 147,617	$ 115,666

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Apr. 04, 2020	Jan. 02, 2021
Indefinite-lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 4,700	$ 4,700
Goodwill	359,746		$ 329,695
Southeast Segment [Member]
Indefinite-lived Intangible Assets [Line Items]
Goodwill	231,300		201,300
Western Segment [Member]
Indefinite-lived Intangible Assets [Line Items]
Goodwill	$ 128,400		$ 128,400

Long Term Debt - Schedule of Lo

Long Term Debt - Schedule of Long-term Debt (Detail) - USD ($) $ in Thousands	Apr. 03, 2021	Jan. 02, 2021
Debt Instrument [Line Items]
Long-term debt	$ 479,000	$ 419,000
Fees, costs, discount and premium	(4,735)	(6,902)
Long-term debt, net	474,265	412,098
2016 Credit Agreement due 2022, Maturing in October 2022 [Member]
Debt Instrument [Line Items]
Long-term debt	54,000	54,000
2018 Senior Notes due 2026, Maturing in August 2026 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 425,000	$ 365,000

Long-Term Debt - Additional Inf

Long-Term Debt - Additional Information (Detail) - USD ($)

Feb. 01, 2021

Jan. 25, 2021

Jan. 24, 2020

Oct. 31, 2019

Aug. 10, 2018

Mar. 16, 2018

Feb. 16, 2016

Feb. 29, 2016

Apr. 03, 2021

Oct. 03, 2020

Dec. 28, 2019

Apr. 03, 2021

Jan. 02, 2021

Line of Credit Facility [Line Items]

Face value of debt outstanding

$ 479,000,000

$ 479,000,000

$ 419,000,000

Letters of credit outstanding

5,800,000

5,800,000

Fees and cost

4,735,000

4,735,000

2016 Credit Agreement due 2022 [Member]

Line of Credit Facility [Line Items]

Face value of debt outstanding

54,000,000

54,000,000

$ 54,000,000

Accrued interest

$ 16,000

Credit agreement date

Feb. 16, 2016

Total barrowings after making prepayments during period

$ 10,000,000

Prepayment of term loan

$ 214,000,000

Credit agreement inception year month

2016-02

Credit facility maturity date

Oct. 31, 2022

Senior Secured Credit Facilities [Member]

Line of Credit Facility [Line Items]

Amount available under credit facility

$ 310,000,000

Term Loan Facility [Member]

Line of Credit Facility [Line Items]

Amount available under credit facility

$ 270,000,000

Maturity term of credit agreement

6 years

Credit facility amortization percentage

1.00%

Weighted average interest rate

2.14%

2.14%

2.15%

Revolving Credit Facility [Member]

Line of Credit Facility [Line Items]

Amount available under credit facility

$ 40,000,000

Revolving Credit Facility [Member] | Maximum [Member]

Line of Credit Facility [Line Items]

Credit facility amortization percentage

0.35%

Revolving Credit Facility [Member] | Minimum [Member]

Line of Credit Facility [Line Items]

Credit facility amortization percentage

0.25%

Second Amendment [Member]

Line of Credit Facility [Line Items]

Interest rate terms

The Second Amendment, among other things, decreases the applicable interest rate margins for the Initial Term Loans (as defined in the 2016 Credit Agreement due 2022) from (i) 3.75% to 2.50%, in the case of the Base Rate Loans (as defined in the 2016 Credit Agreement due 2022), and (ii) 4.75% to 3.50%, in the case of the Eurodollar Loans (as defined in the 2016 Credit Agreement due 2022).

Second Amendment [Member] | Base Rate [Member]

Line of Credit Facility [Line Items]

Basis spread on LIBOR

2.50%

3.75%

Second Amendment [Member] | Euro Dollar [Member]

Line of Credit Facility [Line Items]

Basis spread on LIBOR

3.50%

4.75%

Third Amendment [Member]

Line of Credit Facility [Line Items]

Face value of debt outstanding

$ 64,000,000

Interest rate terms

The Third Amendment decreases the applicable interest rate margins for the Initial Term Loan A from (i) 2.50% to a spread of 1.00% to 1.75% based on our first lien net leverage ratio, in the case of the Base Rate Loans (with a floor of 100 basis points), and (ii) 3.50% to a spread ranging from 2.00% to 2.75% based on our first lien leverage ratio, in the case of the Eurodollar Loans (with a floor of zero basis points).

Term of credit facility

3 years

Fees and cost

$ 900,000

Expected written-off of deferred financing costs

$ 1,500,000

Maximum net leverage ratio

400.00%

Maximum net leverage ratio thereafter

450.00%

Current first lien net leverage ratio description

We have not been required to test our first lien net leverage ratio because we have not exceeded 35% of our revolving capacity.

Third Amendment [Member] | Letter of Credit [Member]

Line of Credit Facility [Line Items]

Excluded unused borrowing capacity from financial covenant leverage

$ 7,500,000

$ 7,500,000

Cash collateralized percentage for borrowings excluded from financial covenant leverage

103.00%

Third Amendment [Member] | Base Rate [Member]

Line of Credit Facility [Line Items]

Basis spread on LIBOR

2.50%

Basis points, floor

1.00%

Third Amendment [Member] | Base Rate [Member] | Maximum [Member]

Line of Credit Facility [Line Items]

Basis spread on LIBOR

1.75%

Third Amendment [Member] | Base Rate [Member] | Minimum [Member]

Line of Credit Facility [Line Items]

Basis spread on LIBOR

1.00%

Third Amendment [Member] | Euro Dollar [Member]

Line of Credit Facility [Line Items]

Basis spread on LIBOR

3.50%

Basis points, floor

0.00%

Third Amendment [Member] | Euro Dollar [Member] | Maximum [Member]

Line of Credit Facility [Line Items]

Basis spread on LIBOR

2.75%

Third Amendment [Member] | Euro Dollar [Member] | Minimum [Member]

Line of Credit Facility [Line Items]

Basis spread on LIBOR

2.00%

Revolving Credit Facility due 2024 [Member]

Line of Credit Facility [Line Items]

Face value of debt outstanding

$ 40,000,000

40,000,000

Term of credit facility

5 years

Credit available under the credit facility

74,200,000

74,200,000

Revolving Credit Facility due 2024 [Member] | Maximum [Member]

Line of Credit Facility [Line Items]

Face value of debt outstanding

$ 80,000,000

Common Stock [Member]

Line of Credit Facility [Line Items]

Business combination, number of shares issuance

357,797

Sale of stock, price per share

$ 21.34

Percentage of discount in sale of stock price per share for lack of marketability

20.00%

ECO [Member]

Line of Credit Facility [Line Items]

Cash payment to acquire business

$ 94,321,000

$ 94,300,000

Fair value of consideration

$ 100,429,000

100,400,000

Sale of stock, price per share

$ 21.34

Percentage of discount in sale of stock price per share for lack of marketability

20.00%

ECO [Member] | Common Stock [Member]

Line of Credit Facility [Line Items]

Business combination, number of shares issuance

357,797

ECO [Member] | Cash On Hand [Member]

Line of Credit Facility [Line Items]

Cash payment to acquire business

$ 94,300,000

$ 31,000,000

2018 Senior Notes due 2026 [Member]

Line of Credit Facility [Line Items]

Long-term debt

$ 50,000,000

$ 315,000,000

Accrued Interest rate

6.75%

6.75%

6.75%

Percentage of principal amount issued

105.50%

106.375%

100.00%

Debt instrument premium

$ 3,300,000

$ 3,200,000

Face value of debt outstanding

60,000,000

425,000,000

$ 425,000,000

Debt instrument, maturity date

Aug. 10, 2026

Accrued interest

$ 4,900,000

Financing Costs

1,300,000

$ 10,400,000

Repurchase notes percentage of aggregate principal amount

101.00%

101.00%

2018 Senior Notes due 2026 [Member] | NewSouth Window Solutions [Member] | Cash On Hand [Member]

Line of Credit Facility [Line Items]

Cash payment to acquire business

$ 90,400,000

2018 Senior Notes due 2026 [Member] | ECO [Member]

Line of Credit Facility [Line Items]

Accrued Interest rate

6.75%

Percentage of principal amount issued

105.50%

Debt instrument premium

$ 3,300,000

Face value of debt outstanding

$ 60,000,000

Second Additional Senior Notes [Member]

Line of Credit Facility [Line Items]

Debt instrument premium

3,300,000

Financing Costs

$ 1,400,000

Long-Term Debt - Activity Relat

Long-Term Debt - Activity Relating to Third-Party Fees and Costs, Lender Fees, Discount and Premiums (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Apr. 04, 2020
Debt Instrument [Line Items]
At beginning of year	$ 6,902
Add: Deferred financing costs from the issuance of Second Additional Senior Notes	1,363	$ 1,266
Less: Amortization expense	(230)
At end of period	4,735
Second Additional Senior Notes [Member]
Debt Instrument [Line Items]
Add: Deferred financing costs from the issuance of Second Additional Senior Notes	1,363
Less: Premium on the Second Additional Senior Notes	$ (3,300)

Long-Term Debt - Estimated Amor

Long-Term Debt - Estimated Amortization Expense Relating to Third-Party Fees and Costs, Lender Fees, Discount and Premiums (Detail) $ in Thousands	Apr. 03, 2021USD ($)
Debt Disclosure [Abstract]
Remainder of 2021	$ 657
2022	905
2023	844
2024	889
2025	861
Thereafter	579
Total	$ 4,735

Long-Term Debt - Contractual Fu

Long-Term Debt - Contractual Future Maturities of Long-Term Debt Outstanding (Detail) - USD ($) $ in Thousands	Apr. 03, 2021	Jan. 02, 2021
Debt Disclosure [Abstract]
Remainder of 2021	$ 0
2022	54,000
2023	0
2024	0
2025	0
Thereafter	425,000
Total	$ 479,000	$ 419,000

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Apr. 04, 2020	Feb. 01, 2021
Lessee Lease Description [Line Items]
Operating lease existence of option to extend	true
Operating lease extension period	5 years
Operating lease existence of option to terminate	true
Operating lease not yet commenced description	no additional operating or finance leases that have not yet commenced
Finance lease not yet commenced description	no additional operating or finance leases that have not yet commenced
Lease expenses	$ 5,100	$ 2,900
Operating lease expire description	Our operating leases expire at various times through 2030.
Operating lease right-of-use assets obtained in exchange for operating lease obligations	$ 29,490	14,605
ECO [Member]
Lessee Lease Description [Line Items]
Operating lease right-of-use asset	27,900		$ 27,864
Cost of Sales [Member]
Lessee Lease Description [Line Items]
Lease expenses	$ 2,200	$ 1,500
Minimum [Member]
Lessee Lease Description [Line Items]
Operating lease term	1 year
Maximum [Member]
Lessee Lease Description [Line Items]
Operating lease term	9 years
Operating lease termination period	1 year

Leases - Components of Lease Ex

Leases - Components of Lease Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Apr. 04, 2020
Leases [Abstract]
Operating lease cost	$ 2,879	$ 2,104
Variable lease cost	2,200	786
Total lease cost	$ 5,079	$ 2,890

Leases - Other Information Rela

Leases - Other Information Relating to Leases (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Apr. 04, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows relating to operating leases	$ (2,764)	$ (2,009)
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$ 29,490	$ 14,605
Weighted average remaining lease term in years
Operating leases	7 years 2 months 23 days	7 years 3 months 7 days
Weighted average discount rate
Operating leases	5.60%	5.90%

Leases - Future Maturities unde

Leases - Future Maturities under Operating Leases (Detail) - USD ($) $ in Thousands	Apr. 03, 2021	Jan. 02, 2021
Leases [Abstract]
Remainder of 2021	$ 9,278
2022	11,830
2023	11,557
2024	11,286
2025	10,871
Thereafter	28,847
Total future minimum lease payments	83,669
Less: Imputed interest	(14,847)	$ (8,641)
Operating lease liability - total	68,822	41,262
Current portion of operating lease liability	8,682	6,132
Operating lease liability, less current portion	$ 60,140	35,130
Remainder of 2021		8,327
2022		7,626
2023		7,149
2024		6,748
2025		6,253
Thereafter		13,800
Total future minimum lease payments		$ 49,903

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	Dec. 22, 2017	Apr. 03, 2021	Apr. 04, 2020	Feb. 01, 2021
Income Taxes [Line Items]
Income tax expense		$ 3,944,000	$ 4,138,000
Effective tax rates	24.70%	23.60%	21.00%
Pre-tax earnings		$ 16,739,000	$ 19,738,000
Excess tax benefits relating to exercises of stock options and lapses of restrictions on stock awards			$ 766,000
Effective tax rates, excluding discrete item		24.10%	24.80%
Payment of estimated federal and state income taxes		$ 0	$ 0
ECO [Member]
Income Taxes [Line Items]
Percentage of ownership stake		75.00%		75.00%
Pre-tax earnings		$ 305,000

Fair Value - Additional Informa

Fair Value - Additional Information (Detail) - USD ($)	3 Months Ended
	Apr. 03, 2021	Apr. 04, 2020	Jan. 02, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of assets, level 2 to level 3 transfers	$ 0	$ 0
Principal outstanding value	479,000,000		$ 419,000,000
2016 Credit Agreement [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of current long-term debt	54,000,000		54,000,000
Principal outstanding value	54,000,000		54,000,000
Second Additional Senior Notes [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of current long-term debt	450,500,000		387,800,000
Principal outstanding value	$ 425,000,000		$ 365,000,000

Fair Value - Schedule of Fair V

Fair Value - Schedule of Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Apr. 03, 2021	Jan. 02, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets (Liabilities)	$ 10,124	$ 3,611
Aluminum Contracts [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets (Liabilities)	5,885	3,190
MTP Contracts [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets (Liabilities)	4,239	421
Significant Other Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets (Liabilities)	10,124	3,611
Significant Other Observable Inputs (Level 2) [Member] | Aluminum Contracts [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets (Liabilities)	5,885	3,190
Significant Other Observable Inputs (Level 2) [Member] | MTP Contracts [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets (Liabilities)	$ 4,239	$ 421

Derivatives - Additional Inform

Derivatives - Additional Information (Detail) $ in Thousands, lb in Millions	3 Months Ended
	Apr. 03, 2021USD ($)ForwardContractlb$ / lb	Jan. 02, 2021USD ($)
Derivative [Line Items]
Derivative assets, net	$ 10,124	$ 3,692
Fair Value of Derivative	$ 8,700
MTP Contracts [Member]
Derivative [Line Items]
Typical order quantities payment terms net	30 days
Derivative assets, net	$ 4,200
Number of outstanding forward contracts | ForwardContract	29
Derivative, amount of hedged item | lb	56.1
Derivative average price | $ / lb	0.12
Maturity period of contract, minimum	1 month
Maturity period of contract, maximum	21 months
Aluminum Contracts [Member]
Derivative [Line Items]
Derivative assets, net	$ 5,900
Number of outstanding forward contracts | ForwardContract	25
Derivative, amount of hedged item | lb	33.7
Derivative average price | $ / lb	0.84
Maturity period of contract, minimum	1 month
Maturity period of contract, maximum	15 months
Aluminum Contracts and MTP Contracts [Member]
Derivative [Line Items]
Accumulated other comprehensive income	$ 7,600	$ 2,700

Derivatives - Summary of Fair V

Derivatives - Summary of Fair Values of Hedges and MTP Contracts (Detail) - USD ($) $ in Thousands	Apr. 03, 2021	Jan. 02, 2021
Derivative Instruments And Hedging Activities [Line Items]
Total derivative instruments Assets	$ 10,124	$ 3,692
Total derivative instruments Liabilities		(81)
Aluminum Contracts [Member] | Other Current Assets [Member]
Derivative Instruments And Hedging Activities [Line Items]
Total derivative instruments Assets	5,714	3,243
Aluminum Contracts [Member] | Other Assets [Member]
Derivative Instruments And Hedging Activities [Line Items]
Total derivative instruments Assets	171
Aluminum Contracts [Member] | Accrued Liabilities [Member]
Derivative Instruments And Hedging Activities [Line Items]
Total derivative instruments Liabilities		(28)
Aluminum Contracts [Member] | Other Liabilities [Member]
Derivative Instruments And Hedging Activities [Line Items]
Total derivative instruments Liabilities		(25)
MTP Contracts [Member] | Other Current Assets [Member]
Derivative Instruments And Hedging Activities [Line Items]
Total derivative instruments Assets	3,010	423
MTP Contracts [Member] | Other Assets [Member]
Derivative Instruments And Hedging Activities [Line Items]
Total derivative instruments Assets	$ 1,229	26
MTP Contracts [Member] | Accrued Liabilities [Member]
Derivative Instruments And Hedging Activities [Line Items]
Total derivative instruments Liabilities		(24)
MTP Contracts [Member] | Other Liabilities [Member]
Derivative Instruments And Hedging Activities [Line Items]
Total derivative instruments Liabilities		$ (4)

Derivatives - Gains (Losses) on

Derivatives - Gains (Losses) on Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Apr. 04, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI(L) on Derivatives	$ 8,288	$ (5,213)
Aluminum Contracts [Member] | Inventory Classified as Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI(L) on Derivatives	4,083	(5,160)
Derivatives in Cash Flow Hedging Relationships	1,388	(612)
MTP Contracts [Member] | Inventory Classified as Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI(L) on Derivatives	4,205	$ (53)
Derivatives in Cash Flow Hedging Relationships	$ 387

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Apr. 04, 2020
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 485,134
Change in fair value of derivatives	8,288	$ (5,213)
Amounts reclassified from other comprehensive loss	(1,775)	612
Tax effect	(1,618)	1,151
Other comprehensive income (loss), net of tax	4,895	(3,450)
Ending Balance	509,266
Accumulated Other Comprehensive Income (Loss) [Member]
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	2,720	(238)
Other comprehensive income (loss), net of tax	4,895	(3,450)
Ending Balance	7,615	(3,688)
Aluminum Contracts [Member]
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Change in fair value of derivatives	4,083	(5,160)
Amounts reclassified from other comprehensive loss	(1,388)	612
Tax effect	(670)	1,138
Other comprehensive income (loss), net of tax	2,025	(3,410)
Aluminum Contracts [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	2,403	(238)
Ending Balance	4,428	(3,648)
MTP Contracts [Member]
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Change in fair value of derivatives	4,205	(53)
Amounts reclassified from other comprehensive loss	(387)
Tax effect	(948)	13
Other comprehensive income (loss), net of tax	2,870	(40)
MTP Contracts [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	317
Ending Balance	$ 3,187	$ (40)

Segments - Additional Informati

Segments - Additional Information (Detail)	3 Months Ended
	Apr. 03, 2021Segment
Segment Reporting [Abstract]
Number of reportable segments	2

Segments - Summary of Financial

Segments - Summary of Financial Data Attributable to Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Apr. 04, 2020
Net sales:
Total net sales	$ 271,092	$ 220,204
Income from operations:
Total income from operations	24,196	26,907
Interest expense, net	7,457	7,169
Total income before income taxes	16,739	19,738
Southeast Segment [Member]
Net sales:
Total net sales	233,638	183,641
Income from operations:
Total income from operations	18,743	25,821
Western Segment [Member]
Net sales:
Total net sales	37,454	36,563
Income from operations:
Total income from operations	$ 5,453	$ 1,086

Reedemable Non-Controlling In_3

Reedemable Non-Controlling Interest - Additional Information (Detail) - USD ($) $ in Thousands	Feb. 01, 2021	Apr. 03, 2021	Apr. 04, 2020
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interest value		$ 34,500
Change in redemption value of redeemable non-controlling interest		$ 0	$ 0
Eco Enterprises, LLC [Member]
Redeemable Noncontrolling Interest [Line Items]
Noncontrolling interest, ownership percentage by parent	75.00%
ECO [Member]
Redeemable Noncontrolling Interest [Line Items]
Sellers equity interest call right exercise period	3 years
Sellers equity interest put right exercise period following call right exercise period	15 days
Sellers equity interest put or call right exercise purchase price description	Upon exercise of the put or call right, the purchase price is calculated based on a 10-multiple of the sum of Eco’s trailing twelve-month earnings before interest, taxes, depreciation and amortization (TTM EBITDA), and certain synergy-related TTM EBITDA which may result from our investment in Eco (both as more specifically defined in the operating agreement).
ECO [Member] | Eco Enterprises, LLC [Member]
Redeemable Noncontrolling Interest [Line Items]
Noncontrolling interest, ownership percentage by non controlling owners	25.00%

Reedemable Non-Controlling In_4

Reedemable Non-Controlling Interest - Summary of Changes in Redeemable Non-Controlling Interest (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Apr. 04, 2020
Noncontrolling Interest [Abstract]
Redeemable non-controlling interest in Eco at initially estimated fair value	$ 34,084
Net income portion attributable to redeemable non-controlling interest	411
Change in value of redeemable non-controlling interest	0	$ 0
Balance at end of period	$ 34,495