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Intangible Assets and Goodwill (Tables) | 6 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of intangible assets | Intangible assets consist of the following (in millions):
|  | September 30, 2018
|  | Gross Amount |  | Accumulated Amortization |  | Net Amount
Core and developed technology |  | $ | 6,266.4 |  |  | $ | (844.9 | ) |  | $ | 5,421.5 |
Customer-related |  | 1,043.9 |  |  | (464.0 | ) |  | 579.9 |
Backlog |  | 27.9 |  |  | (11.2 | ) |  | 16.7 |
In-process research and development |  | 801.9 |  |  | — |  |  | 801.9 |
Distribution rights |  | 0.4 |  |  | (0.2 | ) |  | 0.2 |
Other |  | 7.2 |  |  | (1.5 | ) |  | 5.7 |
Total |  | $ | 8,147.7 |  |  | $ | (1,321.8 | ) |  | $ | 6,825.9 |
|  | March 31, 2018
|  | Gross Amount |  | Accumulated Amortization |  | Net Amount
Core and developed technology |  | $ | 1,952.3 |  |  | $ | (644.4 | ) |  | $ | 1,307.9 |
Customer-related |  | 716.9 |  |  | (375.9 | ) |  | 341.0 |
In-process research and development |  | 12.1 |  |  | — |  |  | 12.1 |
Distribution rights |  | 0.3 |  |  | (0.1 | ) |  | 0.2 |
Other |  | 1.5 |  |  | (0.7 | ) |  | 0.8 |
Total |  | $ | 2,683.1 |  |  | $ | (1,021.1 | ) |  | $ | 1,662.0 |
Schedule of projected amortization expense | The following is an expected amortization schedule for the intangible assets for the remainder of fiscal 2019 through fiscal 2023, absent any future acquisitions or impairment charges (in millions):
Fiscal Year Ending March 31, | Projected Amortization Expense
2019 | $393.9
2020 | $991.9
2021 | $926.6
2022 | $852.0
2023 | $660.4
Schedule of goodwill activity | Goodwill activity for the three and six months ended September 30, 2018 was as follows (in millions):
| Semiconductor Products Reporting Unit |  | Technology Licensing Reporting Unit
Balance at March 31, 2018 | $ | 2,279.8 |  |  | $ | 19.2 |
Additions due to the acquisition of Microsemi | 4,488.5 |  |  | — |
Balance at September 30, 2018 | $ | 6,768.3 |  |  | $ | 19.2 |

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