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Commitments and contingencies (Details) € in Thousands, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Dec. 28, 2012 EUR (€) | Nov. 30, 2014 yr | Dec. 31, 2013 EUR (€) | Jan. 31, 2012 EUR (€) | Mar. 21, 2011 claim | Jun. 28, 2014 EUR (€) | Sep. 29, 2012 EUR (€) | Jul. 04, 2015 USD ($)
BELGIUM | Foreign Tax Authority [Member] |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Interest income earned on deposits related to tax assessment |  |  |  |  |  |  | € 1,583 |
Number of years of assessments appealed | yr |  | 4 |  |  |  |  |  |
BELGIUM | Foreign Tax Authority [Member] | 2008 [Member] |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Assessment received from Belgian tax authority (in euros) |  |  |  | € 23,789 |  | € 30,131 |  |
BELGIUM | Foreign Tax Authority [Member] | 2005 [Member] |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Assessment received from Belgian tax authority (in euros) | € 46,135 |  |  |  |  |  |  |
BELGIUM | Foreign Tax Authority [Member] | 2009 [Member] |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Assessment received from Belgian tax authority (in euros) | € 35,567 |  |  |  |  |  |  |
BELGIUM | Foreign Tax Authority [Member] | 2006 [Member] |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Assessment received from Belgian tax authority (in euros) |  |  | € 38,817 |  |  |  |  |
BELGIUM | Foreign Tax Authority [Member] | 2007 [Member] |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Assessment received from Belgian tax authority (in euros) |  |  | 39,635 |  |  |  |  |
BELGIUM | Foreign Tax Authority [Member] | 2010 [Member] |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Assessment received from Belgian tax authority (in euros) |  |  | € 43,117 |  |  |  |  |
Selling, general and administrative expenses [Member] |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Amount of legal settlement paid and related expenses | $ |  |  |  |  |  |  |  | $ 125,000
Polyurethane Foam Antitrust Litigation [Member] |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of class action complaints | claim |  |  |  |  | 2 |  |  |

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