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Cover - shares
 9 Months Ended
Sep. 27, 2020
Nov. 08, 2020
Cover [Abstract]    
Entity Registrant Name BT BRANDS, INC.  
Entity Central Index Key 0001718224  
Document Type 10-Q  
Amendment Flag false  
Current Fiscal Year End Date --01-03  
Entity Small Business true  
Entity Shell Company false  
Entity Emerging Growth Company true  
Entity Current Reporting Status Yes  
Document Period End Date Sep. 27, 2020  
Entity Filer Category Non-accelerated Filer  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2020  
Entity Ex Transition Period false  
Entity Common Stock Shares Outstanding   8,095,004
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes