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Commitments and Contingencies - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Loss Contingencies [Line Items] |  |  |
Raw material purchased | $ 280,000,000 | $ 370,000,000 | $ 512,000,000
Long term purchase commitment related to information technology | $ 31,000,000 |  |
Purchase agreement period | 5 years |  |
Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration] | Accounts payable and accrued liabilities | Accounts payable and accrued liabilities |
Charges for environmental expense | $ 1,000,000 | $ 1,000,000 | $ 1,000,000
Environmental Remediation Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] | Cost of sales | Cost of sales | Cost of sales
Cash payments for environmental reserves | $ 1,000,000 | $ 1,000,000 | $ 2,000,000
Settlement amount | 3,000,000 | 9,000,000 | 11,000,000
(Provision) benefit for income taxes | (111,000,000) | 28,000,000 | (102,000,000)
Respirator Liabilities [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Respirator reserve | $ 35,000,000 | 38,000,000 |
Respirator reserve period | 10 years |  |
Respirator Liabilities [Member] | Selling and Administrative Expenses [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Respirator charge | $ 0 | 8,000,000 | 6,000,000
Environmental Matters [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Reserved for environmental matters | 5,000,000 | 5,000,000 |
Environmental Matters [Member] | Operating and Maintenance Component [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Reserved for environmental matters | 4,000,000 | 3,000,000 |
Per Accident for Auto [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Self-insured liability | 500,000 |  |
Per Occurrence for All Other [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Self-insured liability | 2,000,000 |  |
Per Accident for U.S. Workers' Compensation [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Self-insured liability | 1,000,000 |  |
Maximum [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Retention for medical costs per person per annum | 275,000 |  |
Non-Controlling Interests [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Raw material purchased | 138,000,000 | 192,000,000 | $ 235,000,000
Accounts payable and accrued liabilities | $ 12,000,000 | $ 11,000,000 |

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