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Derivatives and Hedging-Disclosures and Fair Value Measurements - Offsetting of Financial Assets (Liabilities) and Derivative Assets (Liabilities) (Detail) - Subject to an enforceable master netting arrangement - USD ($) $ in Thousands | Mar. 31, 2022 | Sep. 30, 2021
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Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Gross Assets Recognized | $ 40,432 | $ 31,383
Gross Liabilities Offset in the Statement of Financial Position | (726) | (3,601)
Net Assets (Liabilities) Presented in the Statement of Financial Position | 39,706 | 27,782
Gross Amounts Not Offset in the Statement of Financial Position, Net Amount | 39,706 | 27,782
Fair asset value of derivative instruments |  |
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Gross Assets Recognized | 38,503 | 29,360
Gross Liabilities Offset in the Statement of Financial Position | (726) | (3,138)
Net Assets (Liabilities) Presented in the Statement of Financial Position | 37,777 | 26,222
Gross Amounts Not Offset in the Statement of Financial Position, Net Amount | 37,777 | 26,222
Other long-term assets, net |  |
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Gross Assets Recognized | 1,929 | 2,023
Gross Liabilities Offset in the Statement of Financial Position |  | (463)
Net Assets (Liabilities) Presented in the Statement of Financial Position | 1,929 | 1,560
Gross Amounts Not Offset in the Statement of Financial Position, Net Amount | $ 1,929 | $ 1,560

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