v3.25.2
Cover Page - shares
 6 Months Ended
Jun. 28, 2025
Jul. 25, 2025
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 28, 2025  
Document Transition Report false  
Entity File Number 001-32383  
Entity Registrant Name BlueLinx Holdings Inc.  
Entity Incorporation, State or Country Code DE  
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  
Title of 12(b) Security Common Stock, par value $0.01 per share  
Trading Symbol BXC  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   7,892,416
Entity Central Index Key 0001301787  
Current Fiscal Year Date --01-03  
Amendment Flag false  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2