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Special Charges and Other, Net - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |
Supply Commitment, Period |  | 10 years |  |
Non-restructuring contract exit costs and other |  | $ 0.0 | $ 20.0 | $ 0.0
Employee separation costs |  | 65.3 | 1.2 | 39.1
Contract exit costs |  | (4.7) | 0.7 | 44.1
Gain on sale of assets |  | 0.0 | 4.4 | 0.0
Contract Termination |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Non-restructuring contract exit costs and other |  |  | $ 19.5 |
Contract termination fee, period |  |  | 5 years |
Atmel Corporation |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Employee separation costs |  |  | $ 1.2 |
Semiconductor Products | Contract Termination |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, cost incurred to date |  | 40.8 |  |
Contract exit costs |  | (4.7) | $ 0.7 | $ 44.1
Semiconductor Products | Employee Separation |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Employee separation costs |  | 65.3 |  |
Restructuring and related cost, cost incurred to date |  | $ 115.2 |  |
San Jose Facility | Micrel Incorporated |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Proceeds from sale of property and assets | $ 10.0 |  |  |
Gain on sale of assets | $ 4.4 |  |  |

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