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Derivatives and Hedging-Disclosures and Fair Value Measurements - Offsetting of Financial Assets (Liabilities) and Derivative Assets (Liabilities) (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Sep. 30, 2024
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Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Net Assets (Liabilities) Presented in the Statement of Financial Position | $ (7,041) | $ (13,971)
Subject to an enforceable master netting arrangement |  |
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Net Assets (Liabilities) Presented in the Statement of Financial Position | (7,041) | (13,971)
Net Assets (Liabilities) Presented in the Statement of Financial Position | (76) | (136)
Gross Assets Recognized | 9,929 | 17,779
Gross Liabilities Offset in the Statement of Financial Position | (16,991) | (31,884)
Net Assets (Liabilities) Presented in the Statement of Financial Position | (7,062) | (14,105)
Gross Amounts Not Offset in the Statement of Financial Position, Net Amount | (7,062) | $ (14,105)
Subject to an enforceable master netting arrangement | Fair asset value of derivative instruments |  |
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Gross Assets Recognized | 95 |
Gross Liabilities Offset in the Statement of Financial Position | (44) |
Net Assets (Liabilities) Presented in the Statement of Financial Position | $ 51 |
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Derivative Asset, Current | Derivative Asset, Current
Gross Amounts Not Offset in the Statement of Financial Position, Net Amount | $ 51 |
Subject to an enforceable master netting arrangement | Other long-term assets, net |  |
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Gross Assets Recognized | 10 | $ 5
Gross Liabilities Offset in the Statement of Financial Position | (6) | (3)
Net Assets (Liabilities) Presented in the Statement of Financial Position | $ 4 | $ 2
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Derivative Asset, Current | Derivative Asset, Current
Gross Amounts Not Offset in the Statement of Financial Position, Net Amount | $ 4 | $ 2
Subject to an enforceable master netting arrangement | Fair liability value of derivative instruments |  |
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Gross Assets Recognized | 9,190 | 16,948
Gross Liabilities Offset in the Statement of Financial Position | (16,231) | (30,919)
Gross Amounts Not Offset in the Statement of Financial Position, Net Amount | (7,041) | (13,971)
Subject to an enforceable master netting arrangement | Other long-term liabilities, net |  |
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Gross Assets Recognized | 634 | 826
Gross Liabilities Offset in the Statement of Financial Position | (710) | (962)
Gross Amounts Not Offset in the Statement of Financial Position, Net Amount | $ (76) | $ (136)

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