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Leases - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Lessee Lease Description [Line Items] |  |  |
Short term lease costs | $ 7 | $ 7 | $ 7
Variable lease cost | $ 1 | $ 2 | $ 2
Minimum [Member] |  |  |
Lessee Lease Description [Line Items] |  |  |
Lease term | 1 year |  |
Maximum [Member] |  |  |
Lessee Lease Description [Line Items] |  |  |
Lease term | 12 years |  |
Lease extension period | 15 years |  |
Maximum [Member] | Land [Member] |  |  |
Lessee Lease Description [Line Items] |  |  |
Lease term | 77 years |  |

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- Definition Amount of short-term lease cost, excluding expense for lease with term of one month or less. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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