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Commitments, contingencies and other (Narrative) (Details) | 3 Months Ended | 0 Months Ended | 3 Months Ended |  |  | 1 Months Ended | 0 Months Ended
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Mar. 30, 2013 USD ($) | Mar. 30, 2013 Cost of Sales [Member] USD ($) | Mar. 30, 2013 Selling, General and Administrative [Member] USD ($) | Jan. 30, 2013 BELGIUM Foreign Tax Authority [Member] USD ($) | Mar. 31, 2012 BELGIUM Foreign Tax Authority [Member] EUR (€) | Jan. 30, 2013 BELGIUM Foreign Tax Authority [Member] EUR (€) | Dec. 28, 2012 BELGIUM Foreign Tax Authority [Member] EUR (€) | Jan. 31, 2012 BELGIUM Foreign Tax Authority [Member] Two Thousand and Eight [Member] EUR (€) | Dec. 28, 2012 BELGIUM Foreign Tax Authority [Member] Two Thousand and Five [Member] EUR (€) | Dec. 28, 2012 BELGIUM Foreign Tax Authority [Member] Two Thousand and Nine [Member] EUR (€)
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Assessment received from Belgian tax authority (in euros) |  |  |  |  |  |  |  | € 23,789,000 | € 46,135,000 | € 35,567,000
Interest on assessment (in euros) |  |  |  |  | 2,912,000 |  |  |  |  |
Refund of interest deposit |  |  |  |  |  | 2,912,000 | 23,789,000 |  |  |
Interest Tax Examination, Refund, Interest Income |  |  |  | 2,000,000 |  |  |  |  |  |
Pre-tax business restructuring charges | $ 8,222,000 | $ 3,006,000 | $ 5,216,000 |  |  |  |  |  |  |

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- Definition The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Net total Increase or Decrease in the accrual for restructuring costs during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 146 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 95-3 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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