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Offsetting of Financial Assets (Liabilities) and Derivative Assets (Liabilities) (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | ---
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Net Assets (Liabilities) Presented in the Statement of Financial Position |  | $ 17,710
Net Assets (Liabilities) Presented in the Statement of Financial Position | $ (18,065) |
Subject to an enforceable master netting arrangement |  |
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Gross Assets Recognized | 40,440 | 18,616
Gross Liabilities Offset in the Statement of Financial Position | (58,757) | (103)
Net Assets (Liabilities) Presented in the Statement of Financial Position | (18,317) | 18,513
Financial Instruments |  | 0
Cash Collateral Received |  | 0
Net Amount | (18,317) | 18,513
Subject to an enforceable master netting arrangement | Fair asset and fair liability value of derivative instruments |  |
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Gross Assets Recognized |  | 17,710
Net Assets (Liabilities) Presented in the Statement of Financial Position |  | 17,710
Financial Instruments |  | 0
Cash Collateral Received |  | 0
Net Amount |  | 17,710
Subject to an enforceable master netting arrangement | Deferred charges and other assets, net |  |
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Gross Assets Recognized | 17 |
Gross Liabilities Offset in the Statement of Financial Position | (14) |
Net Assets (Liabilities) Presented in the Statement of Financial Position | 3 |
Net Amount | 3 |
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 |  | 906
Gross Liabilities Offset in the Statement of Financial Position |  | (103)
Net Assets (Liabilities) Presented in the Statement of Financial Position |  | 803
Financial Instruments |  | 0
Cash Collateral Received |  | 0
Net Amount |  | 803
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 | 38,247 |
Gross Liabilities Offset in the Statement of Financial Position | (56,312) |
Net Assets (Liabilities) Presented in the Statement of Financial Position | (18,065) |
Financial Instruments |  | 0
Cash Collateral Received |  | 0
Net Amount | (18,065) |
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 | 2,176 |
Gross Liabilities Offset in the Statement of Financial Position | (2,431) |
Net Assets (Liabilities) Presented in the Statement of Financial Position | (255) |
Financial Instruments |  | 0
Cash Collateral Received |  | $ 0
Net Amount | $ (255) |

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