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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 | Dec. 31, 2021 | Sep. 30, 2021
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Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Gross Assets Recognized | $ 23,518 | $ 31,383
Gross Liabilities Offset in the Statement of Financial Position | (5,416) | (3,601)
Net Assets (Liabilities) Presented in the Statement of Financial Position | 18,102 | 27,782
Gross Amounts Not Offset in the Statement of Financial Position, Net Amount | 18,102 | 27,782
Fair asset value of derivative instruments |  |
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Gross Assets Recognized | 21,640 | 29,360
Gross Liabilities Offset in the Statement of Financial Position | (5,037) | (3,138)
Net Assets (Liabilities) Presented in the Statement of Financial Position | 16,603 | 26,222
Gross Amounts Not Offset in the Statement of Financial Position, Net Amount | 16,603 | 26,222
Other long-term assets, net |  |
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Gross Assets Recognized | 1,878 | 2,023
Gross Liabilities Offset in the Statement of Financial Position | (379) | (463)
Net Assets (Liabilities) Presented in the Statement of Financial Position | 1,499 | 1,560
Gross Amounts Not Offset in the Statement of Financial Position, Net Amount | $ 1,499 | $ 1,560

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