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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

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