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Segment reporting (Summary of segment information) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 29, 2014 segment | Mar. 30, 2013 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 1,813,095 | $ 1,486,815 |
Intersegment sales | (24,933) | (24,875) |
Operating income (loss) | 130,735 | 86,842 |
Assets | 8,681,488 |  | 8,494,177
Number of reporting segments | 3 |  |
Carpet Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 674,926 | 695,334 |
Operating income (loss) | 34,271 | 25,238 |
Assets | 1,920,937 |  | 1,786,085
Ceramic Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 695,094 | 411,881 |
Operating income (loss) | 60,659 | 29,976 |
Assets | 3,782,006 |  | 3,787,785
Laminate and Wood Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 468,008 | 404,475 |
Operating income (loss) | 44,119 | 38,693 |
Assets | 2,788,839 |  | 2,716,759
Corporate and Intersegment Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating income (loss) | (8,314) | (7,065) |
Assets | $ 189,706 |  | $ 203,548

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