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Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment reporting information [Line Items] |  |  |  |
Net Sales | $ 1,432.5 | $ 1,012.1 | $ 2,644.9 | $ 1,984.3
Gross Profit | 689.3 | 614.1 | 1,331.3 | 1,198.5
Semiconductor products |  |  |  |
Segment reporting information [Line Items] |  |  |  |
Net Sales | 1,394.3 | 986.3 | 2,580.0 | 1,933.5
Gross Profit | 651.1 | 588.3 | 1,266.4 | 1,147.7
Technology licensing |  |  |  |
Segment reporting information [Line Items] |  |  |  |
Net Sales | 38.2 | 25.8 | 64.9 | 50.8
Gross Profit | $ 38.2 | $ 25.8 | $ 64.9 | $ 50.8

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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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