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Goodwill by Reporting Segment (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2018 | Apr. 04, 2016
Goodwill [Roll Forward] |  |  |
Goodwill, ending balance | $ 2,299.0 |  |
Goodwill | 2,299.0 | $ 2,299.0 |
Atmel Corporation |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill |  |  | $ 1,286.4
Semiconductor products |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance | 993.5 |  |
Goodwill, ending balance | 2,279.8 |  |
Goodwill | 993.5 | 2,279.8 |
Semiconductor products | Atmel Corporation |  |  |
Goodwill [Roll Forward] |  |  |
Additions due to business combination | 1,286.3 |  |
Technology licensing |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance | 19.2 |  |
Goodwill, ending balance | 19.2 |  |
Goodwill | 19.2 | $ 19.2 |
Technology licensing | Atmel Corporation |  |  |
Goodwill [Roll Forward] |  |  |
Additions due to business combination | $ 0.0 |  |

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + 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 (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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