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Offsetting of Financial Assets (Liabilities) and Derivative Assets (Liabilities) (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | ---
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Net Assets (Liabilities) Presented in the Statement of Financial Position | $ 19,220 | $ 5,932
Net Assets (Liabilities) Presented in the Statement of Financial Position |  | (289)
Subject to an enforceable master netting arrangement |  |
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Gross Assets Recognized | 19,975 | 8,725
Gross Liabilities Offset in the Statement of Financial Position | (6) | (2,817)
Net Assets (Liabilities) Presented in the Statement of Financial Position | 19,969 | 5,908
Financial Instruments |  | 0
Cash Collateral Received |  | 0
Net Amount | 19,969 | 5,908
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 | 19,220 | 6,023
Gross Liabilities Offset in the Statement of Financial Position |  | (91)
Net Assets (Liabilities) Presented in the Statement of Financial Position | 19,220 | 5,932
Financial Instruments |  | 0
Cash Collateral Received |  | 0
Net Amount | 19,220 | 5,932
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 | 755 |
Gross Liabilities Offset in the Statement of Financial Position | (6) |
Net Assets (Liabilities) Presented in the Statement of Financial Position | 749 |
Net Amount | $ 749 |
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 |  | 996
Gross Liabilities Offset in the Statement of Financial Position |  | (730)
Net Assets (Liabilities) Presented in the Statement of Financial Position |  | 266
Financial Instruments |  | 0
Cash Collateral Received |  | 0
Net Amount |  | 266
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 |  | 1,706
Gross Liabilities Offset in the Statement of Financial Position |  | (1,995)
Net Assets (Liabilities) Presented in the Statement of Financial Position |  | (289)
Financial Instruments |  | 0
Cash Collateral Received |  | 0
Net Amount |  | (289)
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 Liabilities Offset in the Statement of Financial Position |  | (1)
Net Assets (Liabilities) Presented in the Statement of Financial Position |  | (1)
Financial Instruments |  | 0
Cash Collateral Received |  | 0
Net Amount |  | $ (1)

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