XML 12 R1.htm IDEA: XBRL DOCUMENT v3.5.0.2
Document And Entity Information - shares
 9 Months Ended
Oct. 02, 2016
Nov. 04, 2016
Document Information [Line Items]    
Entity Registrant Name INTERFACE INC  
Entity Central Index Key 0000715787  
Trading Symbol tile  
Current Fiscal Year End Date --01-01  
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)   64,790,912
Document Type 10-Q  
Document Period End Date Oct. 02, 2016  
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q3  
Amendment Flag false