Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Jan. 03, 2015
Mar. 04, 2015
Jun. 27, 2014
Document Information [Line Items]      
Entity Registrant Name Synalloy Corporation    
Entity Central Index Key 0000095953    
Current Fiscal Year End Date --01-03    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Accelerated Filer    
Entity Public Float     $ 135.6dei_EntityPublicFloat
Entity Common Stock, Shares Outstanding   8,710,302dei_EntityCommonStockSharesOutstanding  
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jan. 03, 2015