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Intangible Assets and Goodwill (Tables) | 12 Months Ended
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Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets | Net amounts excluding fully amortized intangible assets, consist of the following (in millions):
|  | March 31, 2025
|  | Gross Amount |  | Accumulated Amortization |  | Net Amount
Core and developed technology |  | $ | 7,149.9 |  |  | $ | (4,981.6) |  |  | $ | 2,168.3 |
Customer-related |  | 199.5 |  |  | (152.8) |  |  | 46.7 |
In-process research and development |  | 50.8 |  |  | — |  |  | 50.8 |
Software licenses |  | 259.3 |  |  | (136.1) |  |  | 123.2 |
Total |  | $ | 7,659.5 |  |  | $ | (5,270.5) |  |  | $ | 2,389.0 |
|  | March 31, 2024
|  | Gross Amount |  | Accumulated Amortization |  | Net Amount
Core and developed technology |  | $ | 7,221.3 |  |  | $ | (4,590.9) |  |  | $ | 2,630.4 |
Customer-related |  | 196.7 |  |  | (140.8) |  |  | 55.9 |
Software licenses |  | 230.7 |  |  | (135.2) |  |  | 95.5 |
Total |  | $ | 7,648.7 |  |  | $ | (4,866.9) |  |  | $ | 2,781.8 |
Schedule of Indefinite Lived Intangible Assets | Net amounts excluding fully amortized intangible assets, consist of the following (in millions):
|  | March 31, 2025
|  | Gross Amount |  | Accumulated Amortization |  | Net Amount
Core and developed technology |  | $ | 7,149.9 |  |  | $ | (4,981.6) |  |  | $ | 2,168.3 |
Customer-related |  | 199.5 |  |  | (152.8) |  |  | 46.7 |
In-process research and development |  | 50.8 |  |  | — |  |  | 50.8 |
Software licenses |  | 259.3 |  |  | (136.1) |  |  | 123.2 |
Total |  | $ | 7,659.5 |  |  | $ | (5,270.5) |  |  | $ | 2,389.0 |
|  | March 31, 2024
|  | Gross Amount |  | Accumulated Amortization |  | Net Amount
Core and developed technology |  | $ | 7,221.3 |  |  | $ | (4,590.9) |  |  | $ | 2,630.4 |
Customer-related |  | 196.7 |  |  | (140.8) |  |  | 55.9 |
Software licenses |  | 230.7 |  |  | (135.2) |  |  | 95.5 |
Total |  | $ | 7,648.7 |  |  | $ | (4,866.9) |  |  | $ | 2,781.8 |
Schedule of Projected Amortization Expense | The following is an expected amortization schedule for the intangible assets for the fiscal 2026 through fiscal 2030, absent any future acquisitions or impairment charges (in millions):
Fiscal Year Ending March 31, |  | Amortization Expense
2026 |  | $ | 520.8 |
2027 |  | $ | 423.7 |
2028 |  | $ | 313.9 |
2029 |  | $ | 240.4 |
2030 |  | $ | 236.7 |
Schedule of Amortization Expense by Intangible Asset Class | Amortization expense attributed to intangible assets are assigned to cost of sales and operating expenses as follows (in millions):
| Fiscal Year Ended March 31, |  |  |  |
| 2025 |  | 2024 |  | 2023 |  |  |  |  |  |  |  |
Amortization expense charged to cost of sales | $ | 18.5 |  |  | $ | 12.2 |  |  | $ | 15.8 |  |  |  |  |  |  |  |  |
Amortization expense charged to operating expense | 565.8 |  |  | 676.9 |  |  | 737.9 |  |  |  |  |  |  |  |  |
Total amortization expense | $ | 584.3 |  |  | $ | 689.1 |  |  | $ | 753.7 |  |  |  |  |  |  |  |  |
Schedule of Goodwill Activity | Goodwill activity by segment was as follows (in millions):
| Semiconductor Products Reporting Unit |  | Technology Licensing Reporting Unit
Balance at March 31, 2023 | $ | 6,654.4 |  |  | $ | 19.2 |
Additions | 1.8 |  |  | — |
Balance at March 31, 2024 | $ | 6,656.2 |  |  | $ | 19.2 |
Additions | 9.4 |  |  | — |
Balance at March 31, 2025 | $ | 6,665.6 |  |  | $ | 19.2 |
At March 31, 2025, the Company applied a qualitative goodwill impairment test to its two reporting units, and concluded that goodwill was not impaired. Through March 31, 2025, the Company has never recorded a goodwill impairment charge.

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