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Net Sales (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 1,374.7 | $ 994.2 | $ 4,019.7 | $ 2,978.5
Distributors |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 686.3 |  | 2,044.4 |
Direct customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 645.0 |  | 1,867.0 |
Licensees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 43.4 |  | 108.3 |
Microcontrollers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 716.9 |  | 2,218.0 |
Analog, interface, mixed signal and timing products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 396.6 |  | 1,147.7 |
Memory products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 44.0 |  | 142.0 |
Field-programmable gate array products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 97.7 |  | 206.4 |
Technology licensing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 43.4 |  | 108.3 |
Multi-market and other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 76.1 |  | $ 197.3 |

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