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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

X

- 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

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ 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)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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+ References

No definition available.

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