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Goodwill and Intangible Assets | 12 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | 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 millio n 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.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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