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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)