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Net Sales (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 1,432.5	$ 2,644.9
Distributors
Disaggregation of Revenue [Line Items]
Revenues	712.4	1,358.0
Direct customers
Disaggregation of Revenue [Line Items]
Revenues	681.9	1,222.0
Licensees
Disaggregation of Revenue [Line Items]
Revenues	38.2	64.9
Microcontrollers
Disaggregation of Revenue [Line Items]
Revenues	778.6	1,500.9
Analog, interface, mixed signal and timing products
Disaggregation of Revenue [Line Items]
Revenues	419.2	751.1
Memory products
Disaggregation of Revenue [Line Items]
Revenues	48.1	98.1
Field-programmable gate array products
Disaggregation of Revenue [Line Items]
Revenues	70.8	108.7
Technology licensing
Disaggregation of Revenue [Line Items]
Revenues	38.2	64.9
Multi-market and other
Disaggregation of Revenue [Line Items]
Revenues	$ 77.6	$ 121.2

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-Name Accounting Standards Codification
-Topic 606
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