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Intangible Assets and Goodwill - Goodwill by Reporting Segment (Details) $ in Millions | 12 Months Ended
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Mar. 31, 2020 USD ($) | Mar. 31, 2020 reporting_unit | Mar. 31, 2020 unit | Mar. 31, 2019 USD ($)
Goodwill [Roll Forward] |  |  |  |
Goodwill, beginning balance | $ 6,663.9 |  |  |
Goodwill, ending balance | 6,664.8 |  |  | $ 6,663.9
Number of reporting units |  | 2 | 2 |
Semiconductor Products Reporting Unit |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, beginning balance | 6,644.7 |  |  | 2,279.8
Additions | 0.9 |  |  |
Goodwill, ending balance | 6,645.6 |  |  | 6,644.7
Technology Licensing Reporting Unit |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, beginning balance | 19.2 |  |  | 19.2
Additions | 0.0 |  |  |
Goodwill, ending balance | $ 19.2 |  |  | 19.2
Microsemi Corporation | Semiconductor Products Reporting Unit |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Additions |  |  |  | 4,364.9
Microsemi Corporation | Technology Licensing Reporting Unit |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Additions |  |  |  | $ 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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + 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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