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Segment reporting (Summary of segment information) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 27, 2014 | Sep. 28, 2013 | Sep. 27, 2014 segment | Sep. 28, 2013 | Dec. 31, 2013
Segment Reporting [Abstract] |  |  |  |  |
Number of reporting segments |  |  | 3 |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | $ 1,990,658 | $ 1,961,536 | $ 5,852,000 | $ 5,424,650 |
Intersegment sales | (30,607) | (28,943) | (85,582) | (79,535) |
Operating income (loss) | 213,693 | 175,903 | 566,676 | 395,943 |
Assets | 8,701,460 |  | 8,701,460 |  | 8,494,177
Carpet Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 778,849 | 772,751 | 2,234,083 | 2,238,953 |
Operating income (loss) | 74,082 | 68,836 | 171,179 | 148,936 |
Assets | 2,016,109 |  | 2,016,109 |  | 1,786,085
Ceramic Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 779,842 | 767,005 | 2,271,660 | 1,939,054 |
Operating income (loss) | 101,254 | 75,908 | 268,320 | 152,188 |
Assets | 3,788,164 |  | 3,788,164 |  | 3,787,785
Laminate and Wood Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 462,574 | 450,723 | 1,431,839 | 1,326,178 |
Operating income (loss) | 44,768 | 39,020 | 149,730 | 119,075 |
Assets | 2,672,599 |  | 2,672,599 |  | 2,716,759
Corporate and Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income (loss) | (6,411) | (7,861) | (22,553) | (24,256) |
Assets | $ 224,588 |  | $ 224,588 |  | $ 203,548

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