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Offsetting of Financial Assets (Liabilities) and Derivative Assets (liabilities) (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013
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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 | $ 2,342 | $ 646
Net Assets (Liabilities) Presented in the Statement of Financial Position | (12,358) | (3,999)
Subject to an enforceable master netting arrangement |  |
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Gross Assets Recognized | 26,263 | 14,467
Gross Liabilities Offset in the Statement of Financial Position | (36,279) | (17,820)
Net Assets (Liabilities) Presented in the Statement of Financial Position | (10,016) | (3,353)
Financial Instruments | 0 | 0
Cash Collateral Received | 0 | 0
Net Amount | (10,016) | (3,353)
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 | 23,921 | 7,213
Gross Liabilities Offset in the Statement of Financial Position | (36,279) | (11,212)
Net Assets (Liabilities) Presented in the Statement of Financial Position | (12,358) | (3,999)
Financial Instruments | 0 | 0
Cash Collateral Received | 0 | 0
Net Amount | (12,358) | (3,999)
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 | 2,342 | 7,254
Gross Liabilities Offset in the Statement of Financial Position |  | (6,608)
Net Assets (Liabilities) Presented in the Statement of Financial Position | 2,342 | 646
Financial Instruments | 0 | 0
Cash Collateral Received | 0 | 0
Net Amount | $ 2,342 | $ 646

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