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Income (Loss) Per Share - Income from Continuing Operations and Net Income (Loss) Attributable (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 30, 2012
Sep. 30, 2012
Jul. 01, 2012
Apr. 01, 2012
Jan. 01, 2012
Oct. 02, 2011
Jul. 03, 2011
Apr. 03, 2011
Dec. 30, 2012
Jan. 01, 2012
Jan. 02, 2011
Earnings Per Share [Line Items]                      
Income from continuing operations $ 7,392 $ 11,067 $ 10,491 $ (6,051) $ 5,010 $ 11,692 $ 12,231 $ 9,337 $ 22,899 $ 38,270 $ 10,297
Net Income Attributable to Interface, Inc. 7,392 (5,773) 10,258 (5,934) 3,915 12,168 12,814 9,824 5,943 38,721 8,283
Participating securities [Member]
                      
Earnings Per Share [Line Items]                      
Income from continuing operations                 700 1,000 300
Net Income Attributable to Interface, Inc.                 $ 200 $ 1,000 $ 200