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Commitments, contingencies and other (Narrative) (Details) (BELGIUM, Foreign Tax Authority [Member], EUR €) In Thousands, unless otherwise specified | 0 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended
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Jan. 30, 2013 | Jan. 31, 2012 Two Thousand and Eight [Member] | Dec. 28, 2012 Two Thousand and Five [Member] | Dec. 28, 2012 Two Thousand and Nine [Member] | Dec. 31, 2013 Two Thousand and Six [Member] | Dec. 31, 2013 Two Thousand and Seven [Member] | Dec. 31, 2013 Two Thousand and Ten [Member]
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Assessment received from Belgian tax authority (in euros) |  | € 23,789 | € 46,135 | € 35,567 | € 38,817 | € 39,635 | € 43,117
Interest Tax Examination, Refund, Interest Income | € 1,583 |  |  |  |  |  |

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