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Intangible Assets and Goodwill - Intangible Assets, by Major Class (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
May 29, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross amount |  | $ 8,345.4 | $ 2,683.1 |
Accumulated amortization |  | (1,659.8) | (1,021.1) |
Net amount |  | 6,685.6 | 1,662.0 |
Projected Amortization Expense |  |  |  |
2020 |  | 1,005.8 |  |
2021 |  | 944.1 |  |
2022 |  | 873.1 |  |
2023 |  | 680.0 |  |
2024 |  | 608.3 |  |
Amortization of acquired intangible assets |  | 695.8 | 492.2 | $ 346.3
Impairment of intangible assets |  | 3.1 | 0.5 | 11.9
Cost of Sales |  |  |  |
Projected Amortization Expense |  |  |  |
Amortization of acquired intangible assets |  | 9.6 | 6.1 | 4.0
Operating Expense |  |  |  |
Projected Amortization Expense |  |  |  |
Amortization of acquired intangible assets |  | $ 686.2 | 486.1 | $ 342.3
Minimum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Useful life (in years) |  | 1 year |  |
Maximum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Useful life (in years) |  | 15 years |  |
Core and developed technology |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross amount |  | $ 7,413.0 | 1,952.3 |
Accumulated amortization |  | (1,112.9) | (644.4) |
Net amount |  | 6,300.1 | 1,307.9 |
Customer-related |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross amount |  | 917.1 | 716.9 |
Accumulated amortization |  | (544.0) | (375.9) |
Net amount |  | 373.1 | 341.0 |
In-process research and development |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross amount |  | 7.7 | 12.1 |
Accumulated amortization |  | 0.0 | 0.0 |
Net amount |  | 7.7 | 12.1 |
Distribution rights |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross amount |  | 0.3 | 0.3 |
Accumulated amortization |  | (0.2) | (0.1) |
Net amount |  | 0.1 | 0.2 |
Other |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross amount |  | 7.3 | 1.5 |
Accumulated amortization |  | (2.7) | (0.7) |
Net amount |  | $ 4.6 | $ 0.8 |
Microsemi Corporation |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Useful life (in years) | 13 years |  |  |
Purchased intangible assets | $ 5,634.5 |  |  |
Microsemi Corporation | Core and developed technology |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Useful life (in years) | 15 years | 15 years |  |
Purchased intangible assets | $ 4,569.1 | $ 4,570.0 |  |
Microsemi Corporation | Customer-related |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Useful life (in years) | 12 years | 12 years |  |
Purchased intangible assets | $ 200.2 | $ 200.2 |  |
Microsemi Corporation | Backlog |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Useful life (in years) | 1 year | 1 year |  |
Purchased intangible assets | $ 12.3 | $ 12.3 |  |
Microsemi Corporation | In-process research and development |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
In-process research and development |  | 847.1 |  |
In-process technology reaching technological feasibility and reclassified |  | $ 851.5 |  |
Microsemi Corporation | Other |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Useful life (in years) | 4 years | 4 years |  |
Purchased intangible assets | $ 5.8 | $ 5.8 |  |

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