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Offsetting of Financial Assets (Liabilities) and Derivative Assets (Liabilities) (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Net Assets (Liabilities) Presented in the Statement of Financial Position |  | $ 3,987
Net Assets (Liabilities) Presented in the Statement of Financial Position | $ (4,760) | (2,285)
Subject to an enforceable master netting arrangement |  |
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Gross Assets Recognized | 9,474 | 13,061
Gross Liabilities Offset in the Statement of Financial Position | (14,370) | (10,555)
Net Assets (Liabilities) Presented in the Statement of Financial Position | (4,896) | 2,506
Financial Instruments | 0 | 0
Cash Collateral Received | 0 | 0
Net Amount | (4,896) | 2,506
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 | 8,378 | 3,976
Gross Liabilities Offset in the Statement of Financial Position | (13,138) | (6,261)
Net Assets (Liabilities) Presented in the Statement of Financial Position | (4,760) | (2,285)
Financial Instruments | 0 | 0
Cash Collateral Received | 0 | 0
Net Amount | (4,760) | (2,285)
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 | 922 | 481
Gross Liabilities Offset in the Statement of Financial Position | (1,067) | (484)
Net Assets (Liabilities) Presented in the Statement of Financial Position | (145) | (3)
Financial Instruments | 0 | 0
Cash Collateral Received | 0 | 0
Net Amount | (145) | (3)
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 |  | 7,716
Gross Liabilities Offset in the Statement of Financial Position |  | (3,729)
Net Assets (Liabilities) Presented in the Statement of Financial Position |  | 3,987
Financial Instruments | 0 | 0
Cash Collateral Received | 0 | 0
Net Amount |  | 3,987
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 | 174 | 888
Gross Liabilities Offset in the Statement of Financial Position | (165) | (81)
Net Assets (Liabilities) Presented in the Statement of Financial Position | 9 | 807
Financial Instruments | 0 | 0
Cash Collateral Received | 0 | 0
Net Amount | $ 9 | $ 807

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