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Goodwill and intangible assets - Schedule of intangible assets subject to amortization (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Apr. 02, 2016 | Apr. 04, 2015 | Dec. 31, 2015
Finite-lived Intangible Assets [Roll Forward] |  |  |
Intangible assets subject to amortization, beginning balance | $ 838,764 |  |
Intangible assets recognized or adjusted during the period | 0 |  |
Currency translation during the period | 23,611 |  |
Intangible assets subject to amortization, ending balance | 862,375 |  |
Accumulated amortization, beginning balance | 534,572 |  |
Amortization during the period | 9,564 | $ 5,106 |
Currency translation during the period | 16,366 |  |
Accumulated amortization, ending balance | 560,502 |  |
Intangible assets subject to amortization, net | 301,873 |  | $ 304,192
Customer Relationships [Member] |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Intangible assets subject to amortization, beginning balance | 588,716 |  |
Intangible assets recognized or adjusted during the period | 0 |  |
Currency translation during the period | 13,825 |  |
Intangible assets subject to amortization, ending balance | 602,541 |  |
Accumulated amortization, beginning balance | 317,593 |  |
Amortization during the period | 6,744 |  |
Currency translation during the period | 7,225 |  |
Accumulated amortization, ending balance | 331,562 |  |
Intangible assets subject to amortization, net | 270,979 |  |
Patents [Member] |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Intangible assets subject to amortization, beginning balance | 243,258 |  |
Intangible assets recognized or adjusted during the period | 0 |  |
Currency translation during the period | 10,217 |  |
Intangible assets subject to amortization, ending balance | 253,475 |  |
Accumulated amortization, beginning balance | 216,273 |  |
Amortization during the period | 2,810 |  |
Currency translation during the period | 9,165 |  |
Accumulated amortization, ending balance | 228,248 |  |
Intangible assets subject to amortization, net | 25,227 |  |
Other [Member] |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Intangible assets subject to amortization, beginning balance | 6,790 |  |
Intangible assets recognized or adjusted during the period | 0 |  |
Currency translation during the period | (431) |  |
Intangible assets subject to amortization, ending balance | 6,359 |  |
Accumulated amortization, beginning balance | 706 |  |
Amortization during the period | 10 |  |
Currency translation during the period | (24) |  |
Accumulated amortization, ending balance | 692 |  |
Intangible assets subject to amortization, net | $ 5,667 |  |

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- Definition Finite-Lived Intangible Assets, Accumulated Amortization, Translation Adjustments + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of increase (decrease) to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for foreign currency translation adjustments and purchase accounting adjustments. + References No definition available. + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination. + References No definition available. + Details
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