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Financial Instruments and Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Sep. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Supplier Finance Program, Obligation | $ 111 | $ 94
Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Maturity period of short-term investments at the time of purchase | 3 months |
Payment terms of supplier finance programs (in days) | 90 days |
Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Maturity period of short-term investments at the time of purchase | 1 year |
Payment terms of supplier finance programs (in days) | 150 days |

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