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Income (Loss) Per Share - Distributed and Undistributed Earnings (Detail) (USD $) | 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
Basic earnings per share attributable to Interface, Inc. common shareholders |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share from continuing operations | $ 0.11 | $ 0.17 | $ 0.16 | $ (0.10) | $ 0.08 | $ 0.18 | $ 0.19 | $ 0.14 | $ 0.35 | $ 0.59 | $ 0.14
Diluted earnings per share attributable to Interface, Inc. common shareholders |  |  |  |  |  |  |  |  |  |  |
Diluted earnings per share from continuing operations | $ 0.11 | $ 0.17 | $ 0.16 | $ (0.10) | $ 0.08 | $ 0.18 | $ 0.19 | $ 0.14 | $ 0.35 | $ 0.58 | $ 0.14
Basic earnings (loss) per share attributable to Interface, Inc. common shareholders |  |  |  |  |  |  |  |  |  |  |
Basic earnings (loss) per share from discontinued operations | $ 0.00 | $ (0.26) | $ 0.00 | $ 0.00 | $ (0.02) | $ 0.01 | $ 0.01 | $ 0.01 | $ (0.26) | $ 0.01 | $ (0.01)
Diluted earnings (loss) per share attributable to Interface, Inc. common shareholders |  |  |  |  |  |  |  |  |  |  |
Diluted earnings (loss) per share from discontinued operations | $ 0.00 | $ (0.26) | $ 0.00 | $ 0.00 | $ (0.02) | $ 0.01 | $ 0.01 | $ 0.01 | $ (0.26) | $ 0.01 | $ (0.01)
Basic earnings per share attributable to Interface, Inc. common shareholders | $ 0.11 | $ (0.09) | $ 0.16 | $ (0.09) | $ 0.06 | $ 0.19 | $ 0.20 | $ 0.15 | $ 0.09 | $ 0.59 | $ 0.13
Diluted earnings per share attributable to Interface, Inc. common shareholders | $ 0.11 | $ (0.09) | $ 0.16 | $ (0.09) | $ 0.06 | $ 0.19 | $ 0.20 | $ 0.15 | $ 0.09 | $ 0.59 | $ 0.13
Distributed earnings [Member] |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share attributable to Interface, Inc. common shareholders |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share from continuing operations |  |  |  |  |  |  |  |  | $ 0.09 | $ 0.08 | $ 0.04
Diluted earnings per share attributable to Interface, Inc. common shareholders |  |  |  |  |  |  |  |  |  |  |
Diluted earnings per share from continuing operations |  |  |  |  |  |  |  |  | $ 0.09 | $ 0.08 | $ 0.04
Basic earnings (loss) per share attributable to Interface, Inc. common shareholders |  |  |  |  |  |  |  |  |  |  |
Basic earnings (loss) per share from discontinued operations |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0
Diluted earnings (loss) per share attributable to Interface, Inc. common shareholders |  |  |  |  |  |  |  |  |  |  |
Diluted earnings (loss) per share from discontinued operations |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0
Undistributed earnings [Member] |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share attributable to Interface, Inc. common shareholders |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share from continuing operations |  |  |  |  |  |  |  |  | $ 0.26 | $ 0.51 | $ 0.10
Diluted earnings per share attributable to Interface, Inc. common shareholders |  |  |  |  |  |  |  |  |  |  |
Diluted earnings per share from continuing operations |  |  |  |  |  |  |  |  | $ 0.26 | $ 0.50 | $ 0.10
Basic earnings (loss) per share attributable to Interface, Inc. common shareholders |  |  |  |  |  |  |  |  |  |  |
Basic earnings (loss) per share from discontinued operations |  |  |  |  |  |  |  |  | $ (0.26) | $ 0.01 | $ (0.01)
Diluted earnings (loss) per share attributable to Interface, Inc. common shareholders |  |  |  |  |  |  |  |  |  |  |
Diluted earnings (loss) per share from discontinued operations |  |  |  |  |  |  |  |  | $ (0.26) | $ 0.01 | $ (0.01)

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