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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, 2021 | Sep. 30, 2020
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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 |  | $ (11,437)
Subject to an enforceable master netting arrangement |  |
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Gross Assets Recognized | $ 16,328 | 26,164
Gross Liabilities Offset in the Statement of Financial Position | (4,111) | (37,490)
Net Assets (Liabilities) Presented in the Statement of Financial Position | 12,217 | (11,326)
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments |  | 0
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Received |  | 0
Gross Amounts Not Offset in the Statement of Financial Position, Net Amount | 12,217 | (11,326)
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 | 15,082 |
Gross Liabilities Offset in the Statement of Financial Position | (3,666) |
Net Assets (Liabilities) Presented in the Statement of Financial Position | 11,416 |
Gross Amounts Not Offset in the Statement of Financial Position, Net Amount | 11,416 |
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 | 1,246 | 1,605
Gross Liabilities Offset in the Statement of Financial Position | (445) | (1,478)
Net Assets (Liabilities) Presented in the Statement of Financial Position | 801 | 127
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments |  | 0
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Received |  | 0
Gross Amounts Not Offset in the Statement of Financial Position, Net Amount | $ 801 | 127
Subject to an enforceable master netting arrangement | Fair liability and fair asset value of derivative instruments |  |
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Gross Assets Recognized |  | 24,274
Gross Liabilities Offset in the Statement of Financial Position |  | (35,711)
Net Assets (Liabilities) Presented in the Statement of Financial Position |  | (11,437)
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments |  | 0
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Received |  | 0
Gross Amounts Not Offset in the Statement of Financial Position, Net Amount |  | (11,437)
Subject to an enforceable master netting arrangement | Other long-term liabilities |  |
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Gross Assets Recognized |  | 285
Gross Liabilities Offset in the Statement of Financial Position |  | (301)
Net Assets (Liabilities) Presented in the Statement of Financial Position |  | (16)
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments |  | 0
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Received |  | 0
Gross Amounts Not Offset in the Statement of Financial Position, Net Amount |  | $ (16)

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