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Goodwill and Intangible Assets
 12 Months Ended
Sep. 29, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND INTANGIBLE ASSETS .     GOODWILL AND INTANGIBLE ASSETS
The Company’s goodwill balance was $2,176.7 million as of each of September 29, 2023, and September 30, 2022. The Company performed an impairment test of its goodwill and its indefinite-lived intangible assets as of the first day of the fourth fiscal quarter in accordance with its regularly scheduled testing. The results of these tests indicated that the Company’s goodwill and indefinite-lived intangible assets were not impaired. There were no indicators of impairment noted during the fiscal year ended September 29, 2023.

Intangible assets consist of the following (in millions):
As ofAs of

Weighted
average
amortization
period (years)
September 29, 2023September 30, 2022
 
 
 
Gross
carrying
amount

Accumulated
amortization
Net
carrying
amount
Gross
carrying
amount

Accumulated
amortization
Net
carrying
amount
Customer relationships and backlog2.3$154.6 $(154.6)$— $154.6 $(122.3)$32.3 
Developed technology and other6.11,290.4 (379.4)911.0 1,280.9 (209.2)1,071.7 
Technology licenses 2.875.8 (36.0)39.8 105.1 (45.2)59.9 
In-process research and development271.3 — 271.3 280.8 — 280.8 
Total intangible assets$1,792.1 $(570.0)$1,222.1 $1,821.4 $(376.7)$1,444.7 

Fully amortized intangible assets are eliminated from both the gross and accumulated amortization amounts in the first quarter of each fiscal year. During fiscal 2023 and fiscal 2022, $9.5 million and $293.5 million, respectively, of IPR&D assets were transferred to definite-lived intangible assets, and are being amortized over their useful lives of 12 years. Amortization expense related to definite-lived intangible assets was $225.9 million, $288.4 million, and $86.8 million for the fiscal years ended September 29, 2023, September 30, 2022, and October 1, 2021, respectively.
Annual amortization expense for the next five fiscal years related to definite-lived intangible assets, excluding IPR&D, is expected to be as follows (in millions):
20242025202620272028Thereafter
Amortization expense$179.1 $155.7 $127.8 $112.6 $89.9 $285.7