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Restructuring | 12 Months Ended
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Sep. 30, 2025
Restructuring and Related Activities [Abstract] |
Restructuring | Note N. Restructuring 2025 Reorganizations During fiscal 2025, the Company undertook various actions that it believes have enabled the more efficient operation of the Company and reduced ongoing operational costs. These restructuring actions have resulted in reductions in workforce across business and functional teams. Under this plan, the Company recorded total charges of $10 million, primarily related to severance costs. The Company expects to record additional restructuring charges of $1 million and have cash payments of $7 million related to this plan in fiscal 2026. 2024 Reorganizations During fiscal 2024, the Company initiated restructuring activities in both its Reinforcement Materials segment (“RM Plan”) and its Performance Chemicals segment (“PC Plan”). Under the RM Plan, the Company closed its reinforcing carbons unit at the facility in Tianjin, China that the Company acquired from Tokai Carbon Group in February 2022, consolidating its reinforcing carbons operations and reducing ongoing operational costs. Under the PC Plan, the Company temporarily idled its aerogel manufacturing plant in Frankfurt, Germany and reorganized certain positions within the Performance Chemicals segment to reduce operating costs. The Company anticipates restarting its aerogel manufacturing plant in fiscal 2026. As part of these plans, the Company recorded charges of $1 million and $13 million in fiscal 2025 and 2024, respectively, primarily for severance related costs and accelerated depreciation. The Company expects to have cash payments of $1 million related to these plans in fiscal 2026. Details of the 2024 and 2025 Reorganization restructuring activities and the related reserves are as follows:
|  | Severance and Employee Benefits |  |  | Accelerated Depreciation on Assets |  |  | Other |  |  | Total |
|  | (In millions) |
Reserve at September 30, 2023 |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Charges |  |  | 5 |  |  |  | 6 |  |  |  | 2 |  |  |  | 13 |
Costs charged against assets |  |  | — |  |  |  | (6 | ) |  |  | — |  |  |  | (6 | )
Cash paid |  |  | (5 | ) |  |  | — |  |  |  | (1 | ) |  |  | (6 | )
Reserve at September 30, 2024 |  |  | — |  |  |  | — |  |  |  | 1 |  |  |  | 1 |
Charges |  |  | 10 |  |  |  | — |  |  |  | 1 |  |  |  | 11 |
Cash paid |  |  | (3 | ) |  |  | — |  |  |  | (1 | ) |  |  | (4 | )
Reserve at September 30, 2025 |  | $ | 7 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 8 |
Cabot’s restructuring reserves are reflected in Accounts payable and accrued liabilities on the Company’s Consolidated Balance Sheets. Cabot’s restructuring activities were recorded in the Consolidated Statements of Operations as follows:
|  | Years Ended September 30 |
|  | 2025 |  |  | 2024 |  |  | 2023 |
|  | (In millions) |
Cost of sales |  | $ | 6 |  |  | $ | 12 |  |  | $ | 4 |
Selling and administrative expenses |  |  | 3 |  |  |  | 1 |  |  |  | — |
Research and technical expenses |  |  | 2 |  |  |  | — |  |  |  | — |
Total |  | $ | 11 |  |  | $ | 13 |  |  | $ | 4 |

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- Definition The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/420/tableOfContent Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 + Details
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