Quarterly Data and Share Information - Consolidated Financial Data (Detail) (USD $) In Thousands, except Per Share data, 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
Schedule Of Quarterly Financial Data [Line Items]
Net sales	$ 249,595	$ 242,863	$ 229,546	$ 210,016	$ 244,478	$ 248,721	$ 240,566	$ 219,280	$ 932,020	$ 953,045	$ 862,314
Gross profit	85,098	82,861	78,702	70,518	79,875	87,185	87,677	80,005	317,179	334,742	313,130
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
Income (loss) from discontinued operations	0	(16,840)	(233)	117	(1,095)	476	583	487	(16,956)	451	(963)
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
Basic income (loss) per share:
Income (loss) 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
Income (loss) 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)
Net income	$ 0.11	$ (0.09)	$ 0.16	$ (0.09)	$ 0.06	$ 0.19	$ 0.20	$ 0.15	$ 0.09	$ 0.59	$ 0.13
Diluted income (loss) per share:
Income (loss) 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
Income (loss) 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)
Net income	$ 0.11	$ (0.09)	$ 0.16	$ (0.09)	$ 0.06	$ 0.19	$ 0.20	$ 0.15	$ 0.09	$ 0.59	$ 0.13
Maximum [Member]
Share prices
Share prices	$ 16.37	$ 14.79	$ 14.89	$ 14.08	$ 14.38	$ 20.48	$ 20.23	$ 18.49	$ 16.37	$ 14.38
Minimum [Member]
Share prices
Share prices	$ 12.94	$ 11.62	$ 11.14	$ 10.76	$ 9.75	$ 11.02	$ 17.16	$ 15.20	$ 12.94	$ 9.75

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