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Special Charges and Other, Net - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |
Employee separation costs | $ 12.1 | $ 0.3 | $ 57.2 | $ 1.4
Contract exit costs | $ 4.0 | 19.6 | (3.0) | 20.2
Supply commitment, period | 10 years |  |  |
Gain on sale of assets | $ 0.0 | 0.0 | 0.0 | $ 4.4
Contract termination |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Incurred cost |  | 19.5 |  |
Contract termination fee, period | 5 years |  |  |
Semiconductor products |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Employee separation costs | $ 12.1 |  |  |
Contract exit costs | 4.0 |  |  |
Semiconductor products | Contract termination |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs incurred to date | 42.5 |  | 42.5 |
Semiconductor products | Employee Separation Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs incurred to date | $ 107.1 |  | $ 107.1 |
Micrel Incorporated |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Proceeds from sale of property, plant, and equipment |  | 10.0 |  |
San Jose Facility | Micrel Incorporated |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Gain on sale of assets |  | $ 4.4 |  |

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