Goodwill and Intangible Assets

12 Months Ended

Sep. 30, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Note F. Goodwill and Intangible Assets

The carrying amount of goodwill attributable to each reportable segment with goodwill balances and the changes in those balances during the fiscal years ended September 30, 2025 and 2024 are as follows:


	Reinforcement Materials			Performance Chemicals			Total
	(In millions)
Balance at September 30, 2023	$	51		$	83		$	134
Foreign currency impact		(3	)		2			(1	)
Balance at September 30, 2024		48			85			133
Foreign currency impact		2			(1	)		1
Balance at September 30, 2025	$	50		$	84		$	134

The following table provides information regarding the Company’s intangible assets with finite lives:


	September 30, 2025							September 30, 2024
	Gross Carrying Value		Accumulated Amortization			Net Intangible Assets		Gross Carrying Value		Accumulated Amortization			Net Intangible Assets
	(In millions)
Developed technologies(1)	$	41	$	(14	)	$	27	$	34	$	(12	)	$	22
Trademarks		2		(1	)	$	1		2		(1	)		1
Customer relationships		63		(36	)		27		60		(30	)		30
Total intangible assets	$	106	$	(51	)	$	55	$	96	$	(43	)	$	53

(1)

Included within Developed technologies as of September 30, 2025 is $8 million of intangible assets acquired during the first quarter of fiscal 2025 as discussed in Note C above.

Intangible assets are amortized over their estimated useful lives, which range between ten and twenty-five years, with a weighted average amortization period of sixteen years. Amortization expense for each of fiscal 2025, 2024 and 2023 was $6 million and is included in Cost of sales, Selling and administrative expenses and Research and technical expenses in the Consolidated Statements of Operations. Total amortization expense is estimated to be approximately $7 million each year for the next five fiscal years.