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Intangible Assets, by Major Class (Details) - USD ($) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
May 29, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2018
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Gross Amount |  | $ 7,403.8 |  | $ 2,683.1
Accumulated Amortization |  | (1,154.9) |  | (1,021.1)
Net Amount |  | 6,248.9 |  | 1,662.0
In-process technology reaching technological feasibility and reclassified |  | 1.0 |  |
Amortization of Intangible Assets |  | 134.8 | $ 122.8 |
Impairment of Intangible Assets |  | 2.0 | 0.1 |
Projected Amortization Expense |  |  |  |
2019 |  | 855.5 |  |
2020 |  | 1,045.1 |  |
2021 |  | 983.7 |  |
2022 |  | 704.3 |  |
2023 |  | 612.1 |  |
Core and developed technology |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Gross Amount |  | 5,754.9 |  | 1,952.3
Accumulated Amortization |  | (737.6) |  | (644.4)
Net Amount |  | 5,017.3 |  | 1,307.9
Customer-related |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Gross Amount |  | 1,165.1 |  | 716.9
Accumulated Amortization |  | (416.0) |  | (375.9)
Net Amount |  | 749.1 |  | 341.0
Backlog |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Gross Amount |  | 36.9 |  |
Accumulated Amortization |  | (0.4) |  |
Net Amount |  | 36.5 |  |
In-process technology |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Gross Amount |  | 445.1 |  | 12.1
Accumulated Amortization |  | 0.0 |  | 0.0
Net Amount |  | 445.1 |  | 12.1
Distribution rights |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Gross Amount |  | 0.3 |  | 0.3
Accumulated Amortization |  | (0.1) |  | (0.1)
Net Amount |  | 0.2 |  | 0.2
Other |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Gross Amount |  | 1.5 |  | 1.5
Accumulated Amortization |  | (0.8) |  | (0.7)
Net Amount |  | $ 0.7 |  | $ 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 |  | $ 1.0 | 2.0 |
Operating Expense |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Amortization of Intangible Assets |  | $ 133.8 | $ 120.8 |
Microsemi Corporation |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Useful life (in years) | 9 years |  |  |
Purchased intangible assets | $ 4,722.0 |  |  |
Microsemi Corporation | Core and developed technology |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Useful life (in years) | 10 years | 10 years |  |
Purchased intangible assets | $ 3,803.0 | $ 3,800.0 |  |
Microsemi Corporation | Customer-related |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Useful life (in years) |  | 10 years |  |
Purchased intangible assets |  | $ 448.1 |  |
Microsemi Corporation | Backlog |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Useful life (in years) | 1 year | 1 year |  |
Purchased intangible assets | $ 36.9 | $ 36.9 |  |
Microsemi Corporation | In-process technology |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Purchased intangible assets |  | $ 434.0 |  |

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