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Shareholders' Equity - Summary of Shareholders' Equity (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Oct. 03, 2010
Dec. 30, 2012
Jan. 01, 2012
Jan. 02, 2011
Shareholders Equity [Line Items]        
Beginning balance   $ 281,039    
Beginning balance, shares   65,484    
Net income attributable to Interface, Inc.   5,943 38,721 9,334
Stock issuances under employee plans   16    
Stock issuances under employee plans, shares   160    
Other issuances of common stock   58    
Other issuances of common stock, shares   573    
Unamortized stock compensation expense related to restricted stock awards   0    
Cash dividends paid   0    
Forfeitures and compensation expense related to stock awards   (16)    
Forfeitures and compensation expense related to stock awards, shares   (155)    
Pension liability adjustment   771 (5,066) 1,990
Pension liability adjustment, shares   0    
Foreign currency translation adjustment   8,539 (7,614) (1,754)
Dividend to Noncontrolling Interest Partner (7,500)      
Foreign currency translation adjustment, shares   0    
Other   0    
Ending balance   295,702 281,039  
Ending balance, shares   66,062 65,484  
Class A Common Stock [Member]
        
Shareholders Equity [Line Items]        
Beginning balance     5,729 5,649
Beginning balance, shares     57,311 56,521
Net income attributable to Interface, Inc.     0 0
Conversion of common stock     59 16
Conversion of common stock, shares     593 159
Stock issuances under employee plans     50 64
Stock issuances under employee plans, shares     502 631
Other issuances of common stock     0 0
Other issuances of common stock, shares     0 0
Unamortized stock compensation expense related to restricted stock awards     0 0
Cash dividends paid     0 0
Forfeitures and compensation expense related to stock awards     0 0
Pension liability adjustment     0 0
Foreign currency translation adjustment     0 0
Dividend to Noncontrolling Interest Partner       0
Repurchase of Minority Interest       0
Other     0  
Ending balance     5,839 5,729
Ending balance, shares     58,406 57,311
Class B Common Stock [Member]
        
Shareholders Equity [Line Items]        
Beginning balance     716 679
Beginning balance, shares     7,145 6,774
Net income attributable to Interface, Inc.     0 0
Conversion of common stock     (59) (16)
Conversion of common stock, shares     (593) (159)
Stock issuances under employee plans     0 0
Stock issuances under employee plans, shares     0 0
Other issuances of common stock     53 53
Other issuances of common stock, shares     527 530
Unamortized stock compensation expense related to restricted stock awards     0 0
Cash dividends paid     0 0
Forfeitures and compensation expense related to stock awards     0 0
Pension liability adjustment     0 0
Foreign currency translation adjustment     0 0
Dividend to Noncontrolling Interest Partner       0
Repurchase of Minority Interest       0
Other     0  
Ending balance     709 716
Ending balance, shares     7,078 7,145
ADDITIONAL PAID-IN CAPITAL [Member]
        
Shareholders Equity [Line Items]        
Beginning balance   361,400 349,662 343,348
Net income attributable to Interface, Inc.   0 0 0
Conversion of common stock     0 0
Stock issuances under employee plans   2,030 210 2,726
Other issuances of common stock   7,564 11,336 6,418
Unamortized stock compensation expense related to restricted stock awards   (7,610) (11,402) (6,471)
Cash dividends paid   0 0 0
Forfeitures and compensation expense related to stock awards   3,293 11,594 4,540
Pension liability adjustment   0 0 0
Foreign currency translation adjustment   0 0 0
Dividend to Noncontrolling Interest Partner       0
Repurchase of Minority Interest       (899)
Other   0 0  
Ending balance   366,677 361,400 349,662
RETAINED EARNINGS (DEFICIT) [Member]
        
Shareholders Equity [Line Items]        
Beginning balance   (16,764) (49,770) (55,332)
Net income attributable to Interface, Inc.   5,943 38,721 8,283
Conversion of common stock     0 0
Stock issuances under employee plans   0 0 0
Other issuances of common stock   0 0 0
Unamortized stock compensation expense related to restricted stock awards   0 0 0
Cash dividends paid   (5,925) (5,231) (2,721)
Forfeitures and compensation expense related to stock awards   0 0 0
Pension liability adjustment   0 0 0
Foreign currency translation adjustment   0 0 0
Dividend to Noncontrolling Interest Partner       0
Repurchase of Minority Interest       0
Other   0 (484)  
Ending balance   (16,746) (16,764) (49,770)
PENSION LIABILITY [Member]
        
Shareholders Equity [Line Items]        
Beginning balance   (36,262) (31,196) (33,186)
Net income attributable to Interface, Inc.   0 0 0
Conversion of common stock     0 0
Stock issuances under employee plans   0 0 0
Other issuances of common stock   0 0 0
Unamortized stock compensation expense related to restricted stock awards   0 0 0
Cash dividends paid   0 0 0
Forfeitures and compensation expense related to stock awards   0 0 0
Pension liability adjustment   771 (5,066) 1,990
Foreign currency translation adjustment   0 0 0
Dividend to Noncontrolling Interest Partner       0
Repurchase of Minority Interest       0
Other   0 0  
Ending balance   (35,491) (36,262) (31,196)
FOREIGN CURRENCY TRANSLATION ADJUSTMENT [Member]
        
Shareholders Equity [Line Items]        
Beginning balance   (33,883) (26,269) (24,057)
Net income attributable to Interface, Inc.   0 0 0
Conversion of common stock     0 0
Stock issuances under employee plans   0 0 0
Other issuances of common stock   0 0 0
Unamortized stock compensation expense related to restricted stock awards   0 0 0
Cash dividends paid   0 0 0
Forfeitures and compensation expense related to stock awards   0 0 0
Pension liability adjustment   0 0 0
Foreign currency translation adjustment   8,539 (7,614) (2,212)
Dividend to Noncontrolling Interest Partner       0
Repurchase of Minority Interest       0
Other   0 0  
Ending balance   (25,344) (33,883) (26,269)
NON-CONTROLLING INTEREST IN SUBSIDIARY [Member]
        
Shareholders Equity [Line Items]        
Beginning balance       9,080
Net income attributable to Interface, Inc.       1,051
Conversion of common stock       0
Stock issuances under employee plans       0
Other issuances of common stock       0
Unamortized stock compensation expense related to restricted stock awards       0
Cash dividends paid       0
Forfeitures and compensation expense related to stock awards       0
Pension liability adjustment       0
Foreign currency translation adjustment       458
Dividend to Noncontrolling Interest Partner       (7,444)
Repurchase of Minority Interest       (3,145)
Ending balance       $ 0