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Goodwill by Reporting Segment (Details) $ in Millions | 3 Months Ended
--- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 unit
Goodwill By Reporting Segment [Line Items] |  |
Number of reporting units | unit |  | 2
Goodwill [Roll Forward] |  |
Goodwill | $ 2,299.0 |
Goodwill | 7,273.2 |
Semiconductor products |  |
Goodwill [Roll Forward] |  |
Goodwill | 2,279.8 |
Goodwill | 7,254.0 |
Technology licensing |  |
Goodwill [Roll Forward] |  |
Goodwill | 19.2 |
Goodwill | 19.2 |
Microsemi Corporation | Semiconductor products |  |
Goodwill [Roll Forward] |  |
Additions due to the acquisition of Microsemi | 4,974.2 |
Microsemi Corporation | Technology licensing |  |
Goodwill [Roll Forward] |  |
Additions due to the acquisition of Microsemi | $ 0.0 |

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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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- 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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- Definition Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment. + References No definition available. + Details
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- Details
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- Details
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