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Goodwill and Intangible Assets | 9 Months Ended
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Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | C. Goodwill and Intangible Assets The carrying amount of goodwill attributable to each reportable segment and the changes in those balances during the nine months ended June 30, 2024 are as follows:
|  | Reinforcement Materials |  |  | Performance Chemicals |  |  | Total |
|  | (In millions) |
Balance at September 30, 2023 |  | $ | 51 |  |  | $ | 83 |  |  | $ | 134 |
Foreign currency impact |  |  | (2 | ) |  |  | — |  |  |  | (2 | )
Balance at June 30, 2024 |  | $ | 49 |  |  | $ | 83 |  |  | $ | 132 |
The following table provides information regarding the Company’s intangible assets:
|  | June 30, 2024 |  |  | September 30, 2023 |
|  | Gross Carrying Value |  |  | Accumulated Amortization |  |  | Net Intangible Assets |  |  | Gross Carrying Value |  |  | Accumulated Amortization |  |  | Net Intangible Assets |
|  | (In millions) |
Intangible assets with finite lives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Developed technologies |  | $ | 33 |  |  | $ | (11 | ) |  | $ | 22 |  |  | $ | 34 |  |  | $ | (10 | ) |  | $ | 24 |
Trademarks |  |  | 2 |  |  |  | (1 | ) |  |  | 1 |  |  |  | 2 |  |  |  | (1 | ) |  |  | 1 |
Customer relationships |  |  | 63 |  |  |  | (31 | ) |  |  | 32 |  |  |  | 65 |  |  |  | (30 | ) |  |  | 35 |
Total intangible assets |  | $ | 98 |  |  | $ | (43 | ) |  | $ | 55 |  |  | $ | 101 |  |  | $ | (41 | ) |  | $ | 60 |
Intangible assets are amortized over their estimated useful lives, which range betwee n ten and twenty-five years, with a weighted average amortization period of approximately seventeen years. Amortiza tion expense was $1 million for both the three months ended June 30, 2024 and 2023. Amortization expense was $4 million for both the nine months ended June 30, 2024 and 2023. Amortization expense 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 $6 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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