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Acquisitions
 12 Months Ended
Sep. 30, 2025
Business Combination [Abstract]  
Acquisitions

Note C. Acquisitions

On August 4, 2025, Cabot entered into an agreement with Bridgestone Corporation to purchase its carbon black manufacturing facility, Mexico Carbon Manufacturing, S.A. de C.V., in Tamaulipas, Mexico for approximately $70 million, which will be subject to customary closing adjustments. The acquisition is expected to close in the first half of fiscal 2026, subject to regulatory approval.

In October 2024, the Company completed the purchase of certain assets and licensed related technology, which the Company expects to use to manufacture certain products for its battery materials product line. The Company paid $27 million, which was allocated to the identifiable assets on a relative fair value basis, with $19 million allocated to property, plant and equipment and $8 million to intangible assets.