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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 | Mar. 31, 2024 | Sep. 30, 2023
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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 | $ (2,189) | $ (118)
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 | (2,189) | (118)
Net Assets (Liabilities) Presented in the Statement of Financial Position | (41) | (15)
Gross Assets Recognized | 8,161 | 18,670
Gross Liabilities Offset in the Statement of Financial Position | (10,129) | (8,028)
Net Assets (Liabilities) Presented in the Statement of Financial Position | (1,968) | 10,642
Gross Amounts Not Offset in the Statement of Financial Position, Net Amount | (1,968) | 10,642
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 | 1,951 | 17,815
Gross Liabilities Offset in the Statement of Financial Position | (1,729) | (7,155)
Net Assets (Liabilities) Presented in the Statement of Financial Position | $ 222 | $ 10,660
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 | $ 222 | $ 10,660
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 | 124 | 567
Gross Liabilities Offset in the Statement of Financial Position | (84) | (452)
Net Assets (Liabilities) Presented in the Statement of Financial Position | $ 40 | $ 115
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 | $ 40 | $ 115
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 | 5,720 | 76
Gross Liabilities Offset in the Statement of Financial Position | (7,909) | (194)
Gross Amounts Not Offset in the Statement of Financial Position, Net Amount | (2,189) | (118)
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 | 366 | 212
Gross Liabilities Offset in the Statement of Financial Position | (407) | (227)
Gross Amounts Not Offset in the Statement of Financial Position, Net Amount | $ (41) | $ (15)

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