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Goodwill and other intangible assets (Tables) | 12 Months Ended
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Jan. 02, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Other intangible assets |
| January 2, 2016 |  | December 27, 2014
| Cost |  | Accumulated Amortization |  | Net |  | Cost |  | Accumulated Amortization |  | Impairment Loss |  | Net
| (In thousands)
Completed technology | $ | 26,900 |  |  | $ | 11,236 |  |  | $ | 15,664 |  |  | $ | 30,600 |  |  | $ | 9,691 |  |  | $ | 1,788 |  |  | $ | 19,121 |
Research contracts | — |  |  | — |  |  | — |  |  | 100 |  |  | 100 |  |  | — |  |  | — |
Tradename | 100 |  |  | 100 |  |  | — |  |  | 800 |  |  | 775 |  |  | — |  |  | 25 |
Total | $ | 27,000 |  |  | $ | 11,336 |  |  | $ | 15,664 |  |  | $ | 31,500 |  |  | $ | 10,566 |  |  | $ | 1,788 |  |  | $ | 19,146 |
Estimated future amortization expense related to current intangible assets |
| (In thousands)
2016 | $ | 3,457 |
2017 | 3,457 |
2018 | 3,457 |
2019 | 2,818 |
2020 | 900 |
Total | $ | 14,089 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + 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) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + 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) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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