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Intangible Assets and Goodwill - Intangible Assets (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
May 29, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2018
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Gross Amount |  | $ 8,147.7 |  | $ 8,147.7 |  | $ 2,683.1
Accumulated Amortization |  | (1,321.8) |  | (1,321.8) |  | (1,021.1)
Net Amount |  | 6,825.9 |  | 6,825.9 |  | 1,662.0
In-process technology reaching technological feasibility and reclassified |  |  |  | 4.4 |  |
Amortization of intangible assets |  | 173.8 | $ 122.7 | 308.6 | $ 245.5 |
Impairment of intangible assets |  | 1.2 |  | 3.1 | 0.2 |
Projected Amortization Expense |  |  |  |  |  |
2019 |  | 393.9 |  | 393.9 |  |
2020 |  | 991.9 |  | 991.9 |  |
2021 |  | 926.6 |  | 926.6 |  |
2022 |  | 852.0 |  | 852.0 |  |
2023 |  | 660.4 |  | 660.4 |  |
Core and developed technology |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Gross Amount |  | 6,266.4 |  | 6,266.4 |  | 1,952.3
Accumulated Amortization |  | (844.9) |  | (844.9) |  | (644.4)
Net Amount |  | 5,421.5 |  | 5,421.5 |  | 1,307.9
Customer-related |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Gross Amount |  | 1,043.9 |  | 1,043.9 |  | 716.9
Accumulated Amortization |  | (464.0) |  | (464.0) |  | (375.9)
Net Amount |  | 579.9 |  | 579.9 |  | 341.0
Backlog |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Gross Amount |  | 27.9 |  | 27.9 |  |
Accumulated Amortization |  | (11.2) |  | (11.2) |  |
Net Amount |  | 16.7 |  | 16.7 |  |
In-process research and development |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Gross Amount |  | 801.9 |  | 801.9 |  | 12.1
Accumulated Amortization |  | 0.0 |  | 0.0 |  | 0.0
Net Amount |  | 801.9 |  | 801.9 |  | 12.1
Distribution rights |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Gross Amount |  | 0.4 |  | 0.4 |  | 0.3
Accumulated Amortization |  | (0.2) |  | (0.2) |  | (0.1)
Net Amount |  | 0.2 |  | 0.2 |  | 0.2
Other |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Gross Amount |  | 7.2 |  | 7.2 |  | 1.5
Accumulated Amortization |  | (1.5) |  | (1.5) |  | (0.7)
Net Amount |  | 5.7 |  | $ 5.7 |  | $ 0.8
Minimum |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Useful life (in years) |  |  |  | 1 year |  |
Maximum |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Useful life (in years) |  |  |  | 15 years |  |
Cost of sales |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Amortization of intangible assets |  | 2.1 | 3.1 | $ 1.9 | 3.9 |
Operating expense |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Amortization of intangible assets |  | $ 171.7 | $ 305.5 | $ 120.8 | $ 241.6 |
Microsemi Corporation |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Useful life (in years) | 9 years |  |  |  |  |
Purchased intangible assets | $ 5,466.9 |  |  |  |  |
Microsemi Corporation | Core and developed technology |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Useful life (in years) | 15 years | 15 years |  |  |  |
Purchased intangible assets | $ 4,312.1 | $ 4,310.0 |  |  |  |
Microsemi Corporation | Customer-related |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Useful life (in years) |  | 12 years |  |  |  |
Purchased intangible assets |  | $ 326.9 |  |  |  |
Microsemi Corporation | Backlog |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Useful life (in years) | 1 year | 1 year |  |  |  |
Purchased intangible assets | $ 27.9 | $ 27.9 |  |  |  |
Microsemi Corporation | In-process research and development |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Purchased intangible assets |  | $ 794.2 |  |  |  |
Microsemi Corporation | Other |  |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |  |
Useful life (in years) | 4 years |  |  |  |  |
Purchased intangible assets | $ 5.8 |  |  |  |  |

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