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Offsetting of Financial Assets (Liabilities) and Derivative Assets (liabilities) (Detail) (Subject to an enforceable master netting arrangement, USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Sep. 30, 2013
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Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Gross Assets Recognized | $ 6,345 | $ 14,467
Gross Liabilities Offset in the Statement of Financial Position | (9,215) | (17,820)
Net Assets (Liabilities) Presented in the Statement of Financial Position | (2,870) | (3,353)
Financial Instruments |  |
Cash Collateral Received |  |
Net Amount | (2,870) | (3,353)
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 | 5,336 | 7,213
Gross Liabilities Offset in the Statement of Financial Position | (8,253) | (11,212)
Net Assets (Liabilities) Presented in the Statement of Financial Position | (2,917) | (3,999)
Financial Instruments |  |
Cash Collateral Received |  |
Net Amount | (2,917) | (3,999)
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 | 1,009 | 7,254
Gross Liabilities Offset in the Statement of Financial Position | (962) | (6,608)
Net Assets (Liabilities) Presented in the Statement of Financial Position | 47 | 646
Financial Instruments |  |
Cash Collateral Received |  |
Net Amount | $ 47 | $ 646

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