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Net Sales (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Net sales | $ 5,349.5 | $ 3,980.8 | $ 3,407.8
Distributors |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 2,719.1 |  |
Direct customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 2,498.0 |  |
Licensees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 132.4 |  |
Microcontrollers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 2,921.9 |  |
Analog, interface, mixed signal and timing products |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 1,530.7 |  |
Field-programmable gate array products |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 303.8 |  |
Memory products |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 184.0 |  |
Technology licensing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 132.4 |  |
Multi-market and other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | $ 276.7 |  |

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