| Document And Entity Information | Nov. 13, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Amendment Description | This Current Report on Form 8-K/A amends the Current Report on Form 8-K filed with the Securities and Exchange Commission (“SEC”) on November 19, 2020 (the “Initial Form 8-K”) by PGT Innovations, Inc. (the “Company”) regarding the decision of the Audit Committee of the Company’s Board of Directors (the “Audit Committee”) on November 13, 2020, to dismiss KPMG LLP (“KPMG”) as the Company’s independent registered public accounting firm, effective upon the filing of the Company’s Annual Report on Form 10-K for the fiscal year ended January 2, 2021. On March 2, 2021, the Company filed its Annual Report on Form 10-K for the fiscal year ended January 2, 2021, at which time retention of KPMG as the Company’s independent registered public accounting firm ended. The Company notified KPMG on November 16, 2020 that it would be dismissed as the Company’s independent registered public accounting firm. The decision to dismiss KPMG as the Company’s independent registered public accounting firms was at the direction of and approved by the Audit Committee. |
| Document Period End Date | Nov. 13, 2020 |
| Entity Registrant Name | PGT Innovations, Inc. |
| Entity Central Index Key | 0001354327 |
| Entity Emerging Growth Company | false |
| Entity File Number | 001-37971 |
| Entity Incorporation, State or Country Code | DE |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Security Exchange Name | NYSE |
| Title of each class | Common Stock, Par Value $0.01 Per Share |
| Trading Symbol(s) | PGTI |
