Consolidated Condensed Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Oct. 02, 2011	Oct. 03, 2010	Oct. 02, 2011	Oct. 03, 2010
Consolidated Condensed Statements of Operations [Abstract]
NET SALES	$ 273,106	$ 252,724	$ 786,148	$ 696,502
Cost of Sales	178,681	163,244	510,020	453,514
GROSS PROFIT ON SALES	94,425	89,480	276,128	242,988
Selling, General and Administrative Expenses	69,087	61,441	203,125	176,597
Restructuring Charge				3,131
OPERATING INCOME	25,338	28,039	73,003	63,260
Interest Expense	6,428	8,409	19,867	25,346
Bond Retirement Expenses				1,085
Other Expense (Income)	(175)	463	(126)	1,008
INCOME BEFORE INCOME TAX EXPENSE	19,085	19,167	53,262	35,821
Income Tax Expense	6,917	6,825	18,456	13,365
NET INCOME	12,168	12,342	34,806	22,456
Income Attributable to Non-Controlling Interest in Subsidiary		(264)		(876)
NET INCOME ATTRIBUTABLE TO INTERFACE, INC.	$ 12,168	$ 12,078	$ 34,806	$ 21,580
Earnings Per Share Attributable to Interface, Inc. Common Shareholders - Basic	$ 0.19	$ 0.19	$ 0.53	$ 0.34
Earnings Per Share Attributable to Interface, Inc. Common Shareholders - Diluted	$ 0.19	$ 0.19	$ 0.53	$ 0.34
Common Shares Outstanding - Basic	65,469	64,025	65,228	63,623
Common Shares Outstanding - Diluted	65,676	64,578	65,457	64,106