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Document And Entity Information - shares
 9 Months Ended
Oct. 04, 2015
Nov. 06, 2015
Entity Registrant Name INTERFACE INC  
Entity Central Index Key 0000715787  
Trading Symbol tile  
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)   65,850,558
Document Type 10-Q  
Document Period End Date Oct. 04, 2015  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q3  
Amendment Flag false