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Commitments, contingencies and other (Narrative) (Details) | 3 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended | 9 Months Ended
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Sep. 29, 2012 BELGIUM Foreign Tax Authority [Member] EUR (€) | May 20, 2014 BELGIUM Foreign Tax Authority [Member] 2008 [Member] EUR (€) | Jan. 31, 2012 BELGIUM Foreign Tax Authority [Member] 2008 [Member] EUR (€) | Dec. 28, 2012 BELGIUM Foreign Tax Authority [Member] 2005 [Member] EUR (€) | Dec. 28, 2012 BELGIUM Foreign Tax Authority [Member] 2009 [Member] EUR (€) | Dec. 31, 2013 BELGIUM Foreign Tax Authority [Member] 2006 [Member] EUR (€) | Dec. 31, 2013 BELGIUM Foreign Tax Authority [Member] 2007 [Member] EUR (€) | Dec. 31, 2013 BELGIUM Foreign Tax Authority [Member] 2010 [Member] EUR (€) | Mar. 21, 2011 Polyurethane Foam Antitrust Litigation [Member] claim | Sep. 27, 2014 Polyurethane Foam Antitrust Litigation [Member] USD ($)
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of class action complaints |  |  |  |  |  |  |  |  | 2 |
Damages claimed |  |  |  |  |  |  |  |  |  | $ 1,200,000,000
Assessment received from Belgian tax authority (in euros) |  | 30,132,000 | 23,789,000 | 46,135,000 | 35,567,000 | 38,817,000 | 39,635,000 | 43,117,000 |  |
Interest income earned on deposits related to tax assessment | € 1,583,000 |  |  |  |  |  |  |  |  |

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