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Commitments and contingencies (Details) - Belgium - Foreign tax authority - EUR (€) € in Thousands | 1 Months Ended | 36 Months Ended
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Mar. 30, 2019 | Dec. 31, 2014
2005 |  |
Commitments And Contingencies [Line Items] |  |
Assessment received from Belgian tax authority (in euros) |  | € 46,135
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
2008 |  |
Commitments And Contingencies [Line Items] |  |
Assessment received from Belgian tax authority (in euros) |  | 30,131
2009 |  |
Commitments And Contingencies [Line Items] |  |
Assessment received from Belgian tax authority (in euros) |  | 35,567
2010 |  |
Commitments And Contingencies [Line Items] |  |
Assessment received from Belgian tax authority (in euros) |  | € 43,117
2011 |  |
Commitments And Contingencies [Line Items] |  |
Assessment received from Belgian tax authority (in euros) | € 40,617 |
2012 |  |
Commitments And Contingencies [Line Items] |  |
Assessment received from Belgian tax authority (in euros) | 39,732 |
2013 |  |
Commitments And Contingencies [Line Items] |  |
Assessment received from Belgian tax authority (in euros) | 11,358 |
2014 |  |
Commitments And Contingencies [Line Items] |  |
Assessment received from Belgian tax authority (in euros) | 23,919 |
2015 |  |
Commitments And Contingencies [Line Items] |  |
Assessment received from Belgian tax authority (in euros) | 30,610 |
2016 |  |
Commitments And Contingencies [Line Items] |  |
Assessment received from Belgian tax authority (in euros) | 93,145 |
2017 |  |
Commitments And Contingencies [Line Items] |  |
Assessment received from Belgian tax authority (in euros) | € 79,933 |

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