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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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