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Commitments and contingencies (Details) - Belgium - Foreign tax authority € in Thousands |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | ---
Dec. 28, 2012 EUR (€) | Nov. 30, 2014 yr | Dec. 31, 2013 EUR (€) | Jan. 31, 2012 EUR (€) | Jun. 28, 2014 EUR (€) | Sep. 29, 2012 EUR (€)
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Interest income earned on deposits related to tax assessment (in euros) |  |  |  |  |  | € 1,583
Number of years of assessments appealed | yr |  | 4 |  |  |  |
2008 |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Assessment received from Belgian tax authority (in euros) |  |  |  | € 23,789 | € 30,131 |
2005 |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Assessment received from Belgian tax authority (in euros) | € 46,135 |  |  |  |  |
2009 |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Assessment received from Belgian tax authority (in euros) | € 35,567 |  |  |  |  |
2006 |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Assessment received from Belgian tax authority (in euros) |  |  | € 38,817 |  |  |
2007 |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Assessment received from Belgian tax authority (in euros) |  |  | 39,635 |  |  |
2010 |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Assessment received from Belgian tax authority (in euros) |  |  | € 43,117 |  |  |

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