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Financial Instruments and Fair Value Measurements | 12 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Financial Instruments and Fair Value Measurements | Note I. Financial Instruments and Fair Value Measurements The FASB authoritative guidance on fair value measurements defines fair value, provides a framework for measuring fair value, and requires certain disclosures about fair value measurements. The required disclosures focus on the inputs used to measure fair value. The guidance establishes the following hierarchy for categorizing these inputs:
Level 1 | — | Quoted market prices in active markets for identical assets or liabilities
Level 2 | — | Significant other observable inputs (e.g., quoted prices for similar items in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable such as interest rate and yield curves, and market-corroborated inputs)
Level 3 | — | Significant unobservable inputs
There were no transfers of financial assets or liabilities measured at fair value between Level 1 and Level 2, and there were no Level 3 investments during fiscal 2025 or 2024. At both September 30, 2025 and 2024, the fair values of cash and cash equivalents, accounts and notes receivable, accounts payable and accrued liabilities, and short-term borrowings and variable rate debt approximated their carrying values due to the short-term nature of these instruments. Cash and cash equivalents are classified as Level 1 within the fair value hierarchy. At both September 30, 2025 and 2024, Cabot had derivatives relating to foreign currency risks carried at fair value. The Company uses standard models with market-based inputs, which take into account the present value of estimated future cash flows and the ability of Cabot or the financial counterparty to perform. For interest rate and cross-currency swaps, the significant inputs to these models are interest rate curves for discounting future cash flows and are adjusted for credit risk. For forward foreign currency contracts, the significant inputs are interest rate curves for discounting future cash flows, and exchange rate curves of the foreign currency for translating future cash flows. These derivatives are classified as Level 2 instruments within the fair value hierarchy as the fair value determination was based on observable inputs. At September 30, 2025 and 2024, the fair value of Guaranteed investment contracts, included in Other assets on the Consolidated Balance Sheets was $9 million and $8 million, respectively. Guaranteed investment contracts were classified as Level 2 instruments within the fair value hierarchy as the fair value determination was based on other observable inputs. The carrying value and fair value of the long-term fixed rate debt were each $1.09 billion as of September 30, 2025 and each $1.08 billion as of September 30, 2024. The carrying amounts of Cabot’s floating rate long-term debt approximates the fair value. All such measurements are based on observable inputs and are classified as Level 2 within the fair value hierarchy.

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- Definition The entire disclosure for financial instruments. This disclosure includes, but is not limited to, fair value measurements of short and long term marketable securities, international currencies forward contracts, and auction rate securities. Financial instruments may include hedging and non-hedging currency exchange instruments, derivatives, securitizations and securities available for sale at fair value. Also included are investment results, realized and unrealized gains and losses as well as impairments and risk management disclosures. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/825/tableOfContent + Details
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