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Fair Value Measurements | 6 Months Ended
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Mar. 31, 2025
Fair Value Disclosures [Abstract] |
Fair Value Measurements | FAIR VALUE MEASUREMENTS ASC 820, "Fair Value Measurement," defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. ASC 820 also establishes a three-level fair value hierarchy that prioritizes information used in developing assumptions when pricing an asset or liability as follows: Level 1: Observable inputs such as quoted prices in active markets for identical assets or liabilities; Level 2: Quoted prices in active markets for similar assets or liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or inputs, other than quoted prices in active markets, that are observable either directly or indirectly; and Level 3: Unobservable inputs where there is little or no market data, which requires the reporting entity to develop its own assumptions. ASC 820 requires the use of observable market data, when available, in making fair value measurements. When inputs used to measure fair value fall within different levels of the hierarchy, the level within which the fair value measurement is categorized is based on the lowest level input that is significant to the fair value measurement. Recurring Fair Value Measurements The following tables present the Company’s fair value hierarchy for those assets and liabilities measured at fair value (in millions):
| Fair Value Measurements Using:
| Total as of March 31, 2025 |  | Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Other current assets |  |  |  |  |  |  |
Foreign currency exchange derivatives | $ | 22 |  |  | $ | — |  |  | $ | 22 |  |  | $ | — |
Commodity derivatives | 4 |  |  | — |  |  | 4 |  |  | — |
Other noncurrent assets |  |  |  |  |  |  |
Deferred compensation plan assets | 55 |  |  | 55 |  |  | — |  |  | — |
Exchange traded funds (fixed income)(1) | 77 |  |  | 77 |  |  | — |  |  | — |
Exchange traded funds (equity)(1) | 185 |  |  | 185 |  |  | — |  |  | — |
Total assets | $ | 343 |  |  | $ | 317 |  |  | $ | 26 |  |  | $ | — |
Other current liabilities |  |  |  |  |  |  |
Foreign currency exchange derivatives | $ | 36 |  |  | $ | — |  |  | $ | 36 |  |  | $ | — |
Contingent earn-out liabilities | 27 |  |  | — |  |  | — |  |  | 27 |
Total liabilities | $ | 63 |  |  | $ | — |  |  | $ | 36 |  |  | $ | 27 |
(1) Classified as restricted investments for payment of asbestos liabilities. See Note 18, "Commitments and Contingencies," of the notes to the consolidated financial statements for further details.
| Fair Value Measurements Using:
| Total as of September 30, 2024 |  | Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Other current assets |  |  |  |  |  |  |
Foreign currency exchange derivatives | $ | 20 |  |  | $ | — |  |  | $ | 20 |  |  | $ | — |
Commodity derivatives | 2 |  |  | — |  |  | 2 |  |  | — |
Other noncurrent assets |  |  |  |  |  |  |
Deferred compensation plan assets | 56 |  |  | 56 |  |  | — |  |  | — |
Exchange traded funds (fixed income)(1) | 81 |  |  | 81 |  |  | — |  |  | — |
Exchange traded funds (equity)(1) | 200 |  |  | 200 |  |  | — |  |  | — |
Total assets | $ | 359 |  |  | $ | 337 |  |  | $ | 22 |  |  | $ | — |
Other current liabilities |  |  |  |  |  |  |
Foreign currency exchange derivatives | $ | 25 |  |  | $ | — |  |  | $ | 25 |  |  | $ | — |
Commodity derivatives | 1 |  |  | — |  |  | 1 |  |  | — |
Contingent earn-out liabilities | 14 |  |  | — |  |  | — |  |  | 14 |
Other noncurrent liabilities |  |  |  |  |  |  |
Contingent earn-out liabilities | 14 |  |  | — |  |  | — |  |  | 14 |
Total liabilities | $ | 54 |  |  | $ | — |  |  | $ | 26 |  |  | $ | 28 |
(1) Classified as restricted investments for payment of asbestos liabilities. See Note 18, "Commitments and Contingencies," of the notes to the consolidated financial statements for further details. Valuation Methods Commodity derivatives: The commodity derivatives are valued under a market approach using publicized prices, where available, or dealer quotes. Contingent earn-out liabilities: The contingent earn-out liabilities were established using a Monte Carlo simulation based on the forecasted operating results and the earn-out formula specified in the purchase agreements. Deferred compensation plan assets: Assets held in the deferred compensation plans will be used to pay benefits under certain of the Company's non-qualified deferred compensation plans. The investments primarily consist of mutual funds which are publicly traded on stock exchanges and are valued using a market approach based on the quoted market prices. Unrealized gains (losses) on the deferred compensation plan assets are recognized in the consolidated statements of income where they offset unrealized gains and losses on the related deferred compensation plan liability. Exchange traded funds: Investments in exchange traded funds are valued using a market approach based on quoted market prices, where available, or broker/dealer quotes of identical or comparable instruments. Refer to Note 18, "Commitments and Contingencies," of the notes to the consolidated financial statements for further information. Foreign currency exchange derivatives: The foreign currency exchange derivatives are valued under a market approach using publicized spot and forward prices. The following table presents the portion of unrealized gains (losses) recognized in the consolidated statements of income that relate to equity securities still held at March 31, 2025 and 2024 (in millions):
|  | Three Months Ended March 31, |  | Six Months Ended March 31,
| 2025 |  | 2024 |  | 2025 |  | 2024
Deferred compensation plan assets |  | $ | (1) |  |  | $ | 3 |  |  | $ | (2) |  |  | $ | 7 |
Investments in exchange traded funds |  | (7) |  |  | 17 |  |  | (8) |  |  | 39 |
The fair values of cash and cash equivalents, accounts receivable, short-term debt and accounts payable approximate their carrying values. The fair value of long-term debt at March 31, 2025 and September 30, 2024 was as follows (in billions):
|  | March 31, |  | September 30, |
| 2025 |  | 2024 |
Public debt |  | $ | 8.0 |  |  | $ | 8.1 |  |
Other long-term debt |  | 0.3 |  |  | 0.2 |  |
Total fair value of long-term debt |  | $ | 8.3 |  |  | $ | 8.3 |  |
The fair value of public debt was determined primarily using market quotes which are classified as Level 1 inputs within the ASC 820 fair value hierarchy. The fair value of other long-term debt was determined using quoted market prices for similar instruments and are classified as Level 2 inputs within the ASC 820 fair value hierarchy.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 107 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-107 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 940 -SubTopic 820 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478119/940-820-50-1 + Details
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