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Document And Entity Information - shares
 6 Months Ended
Jul. 05, 2015
Aug. 04, 2015
Entity Registrant Name INTERFACE INC  
Entity Central Index Key 0000715787  
Current Fiscal Year End Date --01-03  
Entity Filer Category Large Accelerated Filer  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Well-known Seasoned Issuer Yes  
Entity Common Stock, Shares Outstanding (in shares)   65,854,724
Document Type 10-Q  
Document Period End Date Jul. 05, 2015  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q2  
Amendment Flag false