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Intangible Assets and Goodwill (Tables) | 6 Months Ended
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Sep. 30, 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):
|  | September 30, 2025
|  | Gross Amount |  | Accumulated Amortization |  | Net Amount
Core and developed technology |  | $ | 7,199.9 |  |  | $ | (5,172.1) |  |  | $ | 2,027.8 |
Customer-related |  | 202.5 |  |  | (159.0) |  |  | 43.5 |
Software licenses |  | 258.1 |  |  | (159.9) |  |  | 98.2 |
Total |  | $ | 7,660.5 |  |  | $ | (5,491.0) |  |  | $ | 2,169.5 |
|  | 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 |
Schedule of Indefinite Lived Intangible Assets | Net amounts excluding fully amortized intangible assets, consist of the following (in millions):
|  | September 30, 2025
|  | Gross Amount |  | Accumulated Amortization |  | Net Amount
Core and developed technology |  | $ | 7,199.9 |  |  | $ | (5,172.1) |  |  | $ | 2,027.8 |
Customer-related |  | 202.5 |  |  | (159.0) |  |  | 43.5 |
Software licenses |  | 258.1 |  |  | (159.9) |  |  | 98.2 |
Total |  | $ | 7,660.5 |  |  | $ | (5,491.0) |  |  | $ | 2,169.5 |
|  | 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 |
Schedule of Projected Amortization Expense | The following is an expected amortization schedule for the intangible assets for the remainder of fiscal 2026 through fiscal 2030, absent any future acquisitions or impairment charges (in millions):
Fiscal Year Ending March 31, |  | Amortization Expense
2026 |  | $ | 262.0 |
2027 |  | $ | 424.6 |
2028 |  | $ | 317.9 |
2029 |  | $ | 243.2 |
2030 |  | $ | 238.0 |
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):
|  |  | Three Months Ended September 30, |  | Six Months Ended September 30,
|  |  |  |  |  |  | 2025 |  | 2024 |  | 2025 |  | 2024
Amortization expense charged to cost of sales |  |  |  |  |  |  | $ | 5.0 |  |  | $ | 3.9 |  |  | $ | 10.2 |  |  | $ | 7.6 |
Amortization expense charged to operating expense |  |  |  |  |  |  | 128.7 |  |  | 142.5 |  |  | 255.1 |  |  | 284.5 |
Total amortization expense |  |  |  |  |  |  | $ | 133.7 |  |  | $ | 146.4 |  |  | $ | 265.3 |  |  | $ | 292.1 |
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, 2025 | $ | 6,665.6 |  |  | $ | 19.2 |
Additions due to acquisition | 10.7 |  |  | — |
Balance at September 30, 2025 | $ | 6,676.3 |  |  | $ | 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 September 30, 2025, the Company has never recorded a goodwill impairment charge.

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