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Financial Information by Segment - Financial Information by Reportable Segment (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | $ 854 | $ 705 | $ 2,392 | $ 1,994
Income (loss) from continuing operations before income taxes | 95 | 68 | 16 | 221
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | 822 | 679 | 2,308 | 1,913
Income (loss) from continuing operations before income taxes | 127 | 99 | 367 | 301
Unallocated and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | 32 | 26 | 84 | 81
Income (loss) from continuing operations before income taxes | (32) | (31) | (351) | (80)
Reinforcement Materials [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | 466 | 367 | 1,307 | 1,014
Income (loss) from continuing operations before income taxes | 74 | 51 | 215 | 145
Performance Chemicals [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | 274 | 229 | 771 | 662
Income (loss) from continuing operations before income taxes | 56 | 46 | 160 | 146
Purification Solutions [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | 70 | 71 | 206 | 207
Income (loss) from continuing operations before income taxes | (6) | (2) | (6) | 4
Specialty Fluids [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | 12 | 12 | 24 | 30
Income (loss) from continuing operations before income taxes | $ 3 | $ 4 | $ (2) | $ 6

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