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Goodwill and other intangible assets, net - additional information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |  | 3 Months Ended
--- | --- | --- | --- | ---
Sep. 28, 2014 | Sep. 29, 2013 | Sep. 28, 2014 | Sep. 29, 2013 | Sep. 28, 2014 Semprus Technology | Mar. 31, 2013 Axiom In Process Research and Development
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
In-process research and development impairment | $ 0 | $ 3,354,000 | $ 0 | $ 7,848,000 |  | $ 4,500,000
Net assets |  |  |  |  | 41,000,000 |
Amortization expense of intangible assets | $ 15,000,000 | $ 12,500,000 | $ 47,053,000 | $ 37,072,000 |  |

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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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: 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 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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