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Document and Entity Information - USD ($)
 12 Months Ended
Jan. 01, 2022
Jan. 02, 2021
Feb. 25, 2022
Jul. 02, 2021
Document Information [Line Items]        
Document Type 10-K/A      
Amendment Flag true      
Amendment Description The purpose of this Amendment No. 1 (the “Amendment”) to the Annual Report on Form 10-K of PGT Innovations, Inc. (the “Company”) for the year ended January 1, 2022, which was filed with the United States Securities and Exchange Commission (“SEC”) on March 1, 2022 (the “Original Form 10-K”) is (i) to provide, pursuant to Public Company Accounting Oversight Board ("PCAOB") Auditing Standards ("AS"), an updated report of our current independent registered public accounting firm, Ernst & Young LLP (PCAOB ID: 42), that includes the introductory language required by PCAOB AS 3101.15, including the section title "Critical Audit Matter," to immediately precede the critical audit matter discussed in its report, which was inadvertently excluded from its report as filed in the Original Form 10-K due to typographical error; and (ii) to provide the report of our predecessor independent registered public accounting firm, KPMG LLP (PCAOB ID: 185) ("Predecessor Auditor") relating to the Predecessor Auditor's audits of the Company's consolidated financial statements for periods prior to the Company's 2021 fiscal year, including the Company's consolidated balance sheet as of January 2, 2021, and the Company's consolidated statements of operations, comprehensive income, cash flows, and shareholders' equity for the two-year period ended January 2, 2021, which was inadvertently excluded from the Original Form 10-K due to miscommunication between the Company and the Predecessor Auditor regarding the inclusion of the Predecessor Auditor's report in subsequent filings with the SEC.Except as otherwise set forth in this Explanatory Note, no other information included in the Original Form 10-K is amended or changed by this Amendment. This Amendment does not reflect events occurring after the date of the filing of the Original Form 10-K or modify or update any of the other disclosures contained therein in any way.      
Document Period End Date Jan. 01, 2022      
Document Fiscal Year Focus 2021      
Document Fiscal Period Focus FY      
Trading Symbol PGTI      
Entity Registrant Name PGT Innovations, Inc.      
Entity Central Index Key 0001354327      
Current Fiscal Year End Date --01-01      
Entity Well-known Seasoned Issuer Yes      
Entity Current Reporting Status Yes      
Entity Voluntary Filers No      
Entity Filer Category Large Accelerated Filer      
Entity Small Business false      
Entity Emerging Growth Company false      
ICFR Auditor Attestation Flag true      
Entity Shell Company false      
Entity Common Stock, Shares Outstanding     59,899,927  
Entity Public Float       $ 1,317,945,678
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      
Title of 12(b) Security Common stock, par value $0.01 per share      
Security Exchange Name NYSE      
Auditor Name Ernst & Young LLP      
Entity Interactive Data Current Yes      
Entity Incorporation, State or Country Code DE      
Document Annual Report true      
Document Transition Report false      
Documents Incorporated by Reference

Portions of the Company’s Proxy Statement for the Company’s 2022 Annual Meeting of Stockholders are incorporated by reference into Part III of this Form 10-K. The Company’s Proxy Statement will be filed with the Securities and Exchange Commission pursuant to Regulation 14A.

      
Auditor Firm ID 42      
Auditor Location Tampa, Florida      
KPMG LLP [Member]        
Document Information [Line Items]        
Auditor Name   KPMG LLP    
Auditor Firm ID   185    
Auditor Location   Tampa, Florida