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Intangible Assets and Goodwill (Tables) | 3 Months Ended
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Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible assets | Intangible assets consist of the following (in millions):
|  | June 30, 2018
|  | Gross Amount |  | Accumulated Amortization |  | Net Amount
Core and developed technology |  | $ | 5,754.9 |  |  | $ | (737.6 | ) |  | $ | 5,017.3 |
Customer-related |  | 1,165.1 |  |  | (416.0 | ) |  | 749.1 |
Backlog |  | 36.9 |  |  | (0.4 | ) |  | 36.5 |
In-process research and development |  | 445.1 |  |  | — |  |  | 445.1 |
Distribution rights |  | 0.3 |  |  | (0.1 | ) |  | 0.2 |
Other |  | 1.5 |  |  | (0.8 | ) |  | 0.7 |
Total |  | $ | 7,403.8 |  |  | $ | (1,154.9 | ) |  | $ | 6,248.9 |
|  | 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 |
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 | $855.5
2020 | $1,045.1
2021 | $983.7
2022 | $704.3
2023 | $612.1
Goodwill activity | Goodwill activity for the three months ended June 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 | 4,974.2 |  |  | — |
Balance at June 30, 2018 | $ | 7,254.0 |  |  | $ | 19.2 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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