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Restructuring (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended | 48 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Gain on sale of assets |  | $ 4.4 | $ 0.0 | $ 0.0 |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Restructuring Reserve, Beginning Balance | $ 40.2 | 40.2 | 0.1 |  |
Restructuring Charges |  | 1.9 | 83.2 |  |
Payments for Restructuring |  | (15.1) | (45.9) |  |
Restructuring Reserve, Settled without Cash |  | 0.8 | (2.8) |  |
Restructuring Reserve, Foreign Currency Translation Gain (Loss) |  | 0.3 | (0.7) |  |
Restructuring Reserve, Ending Balance |  | $ 28.1 | 40.2 | 0.1 | $ 28.1
Supply Commitment, Period |  | 10 years |  |  |
Employee separation costs |  | $ 1.2 | 39.1 | 9.6 |
Contract exit costs |  | 0.7 | 44.1 | 0.7 |
Contract Termination |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Incurred Cost |  | $ 19.5 |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Contract Termination Fee, Period |  | 5 years |  |  |
Employee Severance |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Restructuring Reserve, Beginning Balance | 5.4 | $ 5.4 | 0.1 |  |
Restructuring Charges |  | 1.2 | 39.1 |  |
Payments for Restructuring |  | (5.9) | (38.9) |  |
Restructuring Reserve, Settled without Cash |  | (0.2) | (0.5) |  |
Restructuring Reserve, Foreign Currency Translation Gain (Loss) |  | 0.3 | (0.7) |  |
Restructuring Reserve, Ending Balance |  | 0.8 | 5.4 | 0.1 | 0.8
Facility Closing |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Restructuring Reserve, Beginning Balance | 34.8 | 34.8 | 0.0 |  |
Restructuring Charges |  | 0.7 | 44.1 |  |
Payments for Restructuring |  | (9.2) | (7.0) |  |
Restructuring Reserve, Settled without Cash |  | 1.0 | (2.3) |  |
Restructuring Reserve, Foreign Currency Translation Gain (Loss) |  | 0.0 | 0.0 |  |
Restructuring Reserve, Ending Balance |  | 27.3 | 34.8 | 0.0 | 27.3
Atmel Corporation |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Restructuring Reserve, Accrual Adjustment |  |  | 6.3 |  |
Employee separation costs |  | 1.2 |  |  |
Atmel Corporation | Employee Severance |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Restructuring Reserve, Accrual Adjustment |  |  | 6.3 |  |
Atmel Corporation | Facility Closing |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Restructuring Reserve, Accrual Adjustment |  |  | 0.0 |  |
Micrel Incorporated |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Proceeds from sale of property and assets | 10.0 |  |  |  |
Accrued Liabilities |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Current |  | 11.9 |  |  | 11.9
Other Noncurrent Liabilities |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Non-current |  | 16.2 |  |  | 16.2
Semiconductor products |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Employee separation costs |  | 1.2 | 39.1 | 9.6 | 52.2
Contract exit costs |  | $ 0.7 | $ 44.1 | $ 0.7 | $ 45.3
San Jose Facility | Micrel Incorporated |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Gain on sale of assets | 4.4 |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Proceeds from sale of property and assets | $ 10.0 |  |  |  |

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