| Cover Page | Apr. 21, 2021 | Apr. 02, 2021 |
| Cover [Abstract] | ||
| Document Type | 8-K | |
| Document Period End Date | Apr. 21, 2021 | |
| Entity Registrant Name | BlueLinx Holdings Inc | |
| Entity Incorporation, State or Country Code | DE | |
| Entity File Number | 001-32383 | |
| Entity Tax Identification Number | 77-0627356 | |
| Entity Address, Address Line One | 1950 Spectrum Circle | |
| Entity Address, Address Line Two | Suite 300 | |
| Entity Address, City or Town | Marietta | |
| Entity Address, State or Province | GA | |
| Entity Address, Postal Zip Code | 30067 | |
| City Area Code | 770 | |
| Local Phone Number | 953-7000 | |
| Written Communications | false | |
| Soliciting Material | true | |
| Pre-commencement Tender Offer | false | |
| Pre-commencement Issuer Tender Offer | false | |
| Entity Emerging Growth Company | false | |
| Title of 12(b) Security | Common Stock, par value $0.01 per share | |
| Trading Symbol | BXC | |
| Security Exchange Name | NYSE | |
| Amendment Flag | false | |
| Entity Central Index Key | 0001301787 |
