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Financial Information by Segment & Geographic Area - Revenue from External Customers by Geographic Region (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Segment Reporting Information [Line Items] |  |  |
Net sales and other operating revenues | $ 3,994 | $ 3,931 | $ 4,321
Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales and other operating revenues | 3,860 | 3,788 | 4,158
Unallocated and Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales and other operating revenues | 134 | 143 | 163
Reinforcement Materials [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales and other operating revenues | 2,610 | 2,563 | 2,673
Performance Chemicals [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales and other operating revenues | 1,250 | 1,225 | 1,388
Purification Solutions [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales and other operating revenues |  |  | 97
Purification Solutions [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales and other operating revenues |  |  | 97
Americas [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales and other operating revenues | 1,434 | 1,425 | 1,534
Americas [Member] | Reinforcement Materials [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales and other operating revenues | 1,056 | 1,046 | 1,072
Americas [Member] | Performance Chemicals [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales and other operating revenues | 378 | 379 | 419
Americas [Member] | Purification Solutions [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales and other operating revenues |  |  | 43
Asia Pacific [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales and other operating revenues | 1,521 | 1,486 | 1,630
Asia Pacific [Member] | Reinforcement Materials [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales and other operating revenues | 1,015 | 995 | 1,049
Asia Pacific [Member] | Performance Chemicals [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales and other operating revenues | 506 | 491 | 567
Asia Pacific [Member] | Purification Solutions [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales and other operating revenues |  |  | 14
Europe, Middle East and Africa [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales and other operating revenues | 905 | 877 | 994
Europe, Middle East and Africa [Member] | Reinforcement Materials [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales and other operating revenues | 539 | 522 | 552
Europe, Middle East and Africa [Member] | Performance Chemicals [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales and other operating revenues | $ 366 | $ 355 | 402
Europe, Middle East and Africa [Member] | Purification Solutions [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales and other operating revenues |  |  | $ 40

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