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Note 4 - Goodwill and Other Intangible Assets - Amounts for Goodwill and Changes in Carrying Value by Operating Segment (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Mar. 25, 2016 | Dec. 30, 2017 | Dec. 31, 2016
Balance |  |  | $ 403,544 |  | $ 189,767 |
Additions |  |  | 36,716 | [1] | 232,934 | [2]
Impairments | [3] |  |  |  | (8,794) |
Adjustments | [4] |  |  |  | (10,363) |
Adjustments | [5] |  | 13,154 |  |  |
Balance |  |  | 453,414 |  | 403,544 |
Electronics [Member] |  |  |  |  |  |
Balance |  |  | 215,765 |  | 58,246 |
Additions |  | $ 103,800 | 36,716 | [1] | 162,172 | [2]
Impairments | [3] |  |  |  |  |
Adjustments | [4] |  |  |  | (4,653) |
Adjustments | [5] |  | 26,478 |  |  |
Balance |  |  | 278,959 |  | 215,765 |
Automotive [Member] |  |  |  |  |  |
Balance |  |  | 144,585 |  | 80,262 |
Additions |  | $ 61,300 |  | [1] | 70,762 | [2]
Impairments | [3] |  |  |  |  |
Adjustments | [4] |  |  |  | (6,439) |
Adjustments | [5] |  | (8,756) |  |  |
Balance |  |  | 135,829 |  | 144,585 |
Industrial [Member] |  |  |  |  |  |
Balance |  |  | 43,194 |  | 51,259 |
Additions |  |  |  | [1] |  | [2]
Impairments |  |  |  |  | (8,794) |
Adjustments | [4] |  |  |  | 729 |
Adjustments | [5] |  | (4,568) |  |  |
Balance |  |  | $ 38,626 |  | $ 43,194 |
[1] | The 2017 additions resulted from the acquisitions of U.S. Sensor and Monolith.
[2] | The 2016 additions resulted primarily from the acquisitions of PolySwitch, ON and Menber's.
[3] | The 2016 impairments in the Industrial segment was due to the $8.8 million impairment of Custom Products reporting unit goodwill.
[4] | Adjustments in 2016 reflect the impact of changes in foreign exchange rates.
[5] | Adjustments in 2017 reflect adjustments to correct goodwill by segment as well as the impact of changes in foreign exchange rates. The impact of the corrections was an increase in goodwill to the Electronics segment of $21.6 million and a decrease of goodwill of $16.8 million and $4.8 million to the Automotive segment and the Industrial segment, respectively.

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- Definition Amount of increase (decrease) from foreign currency translation adjustments, purchase accounting adjustments and error correction adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References No definition available. + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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