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End date of current fiscal year in the format --MM-DD.

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The type of document being provided (such as 10-K, 10-Q, N-1A, etc). The document type is limited to the same value as the supporting SEC submission type, minus any "/A" suffix. The acceptable values are as follows: S-1, S-3, S-4, S-11, F-1, F-3, F-4, F-9, F-10, 6-K, 8-K, 10, 10-K, 10-Q, 20-F, 40-F, N-1A, 485BPOS, 497, NCSR, N-CSR, N-CSRS, N-Q, 10-KT, 10-QT, 20-FT, and Other.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Document and Entity Information (USD $)	6 Months Ended
Document and Entity Information (USD $)	Jul. 03, 2011	Jul. 02, 2010	Aug. 05, 2011 Common Class A	Aug. 05, 2011 Common Class B
Entity Registrant Name	INTERFACE INC
Entity Central Index Key	0000715787
Document Type	10-Q
Document Period End Date	Jul. 03, 2011
Amendment Flag	false
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--01-01
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float		$ 607,508,423
Entity Common Stock, Shares Outstanding			58,579,758	6,895,457