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Segment reporting (Summary of segment information) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 30, 2013 segment | Mar. 31, 2012 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 1,486,815 | $ 1,409,035 |
Intersegment sales | (24,875) | (21,194) |
Operating income (loss) | 86,842 | 71,976 |
Assets | 7,261,845 |  | 6,303,684
Number of reporting segments | 3 |  |
Mohawk [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 695,334 | 699,880 |
Operating income (loss) | 25,238 | 25,282 |
Assets | 1,802,241 |  | 1,721,214
Dal-Tile [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 411,881 | 392,925 |
Operating income (loss) | 29,976 | 26,028 |
Assets | 1,795,828 |  | 1,731,258
Unilin [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 404,475 | 337,424 |
Operating income (loss) | 38,693 | 27,146 |
Assets | 2,469,264 |  | 2,672,389
Corporate and Intersegment Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating income (loss) | (7,065) | (6,480) |
Assets | $ 1,194,512 |  | $ 178,823

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