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Intangible Assets and Goodwill
 12 Months Ended
Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets and Goodwill Intangible Assets and Goodwill
Net amounts excluding fully amortized intangible assets, consist of the following (in millions):
March 31, 2025
Gross AmountAccumulated AmortizationNet Amount
Core and developed technology$7,149.9 $(4,981.6)$2,168.3 
Customer-related199.5 (152.8)46.7 
In-process research and development50.8 — 50.8 
Software licenses259.3 (136.1)123.2 
Total$7,659.5 $(5,270.5)$2,389.0 

March 31, 2024
Gross AmountAccumulated AmortizationNet Amount
Core and developed technology$7,221.3 $(4,590.9)$2,630.4 
Customer-related196.7 (140.8)55.9 
Software licenses230.7 (135.2)95.5 
Total$7,648.7 $(4,866.9)$2,781.8 

During the twelve months ended March 31, 2025, due to acquisitions, the Company acquired $50.8 million of in-process research and development, $2.8 million of customer-related intangible assets, and $1.1 million of software licenses intangible assets. 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 
The Company amortizes intangible assets over their expected useful lives, which range between 1 and 15 years. Amortization expense attributed to intangible assets are assigned to cost of sales and operating expenses as follows (in millions):
Fiscal Year Ended March 31,
202520242023
Amortization expense charged to cost of sales$18.5 $12.2 $15.8 
Amortization expense charged to operating expense565.8 676.9 737.9 
Total amortization expense$584.3 $689.1 $753.7 

Goodwill activity by segment was as follows (in millions):
 Semiconductor Products Reporting UnitTechnology Licensing Reporting Unit
Balance at March 31, 2023$6,654.4 $19.2 
Additions1.8 — 
Balance at March 31, 2024$6,656.2 $19.2 
Additions9.4 — 
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.