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Fair Value Measurements (Details) - Recurring [Member] - USD ($) $ in Thousands | Jun. 30, 2015 | Sep. 30, 2014
--- | --- | ---
Assets [Abstract] |  |  |
Derivatives | [1] | $ 622 | $ 2,457
Trading securities |  | 19,438 | 19,038
Total assets at fair value |  | 20,060 | 21,495
Liabilities [Abstract] |  |  |
Derivatives | [1] | 1,444 | 2,127
Total liabilities at fair value |  | 1,444 | 2,127
Level 1 [Member] |  |  |
Assets [Abstract] |  |  |
Derivatives | [1] | 0 | 0
Trading securities |  | 19,438 | 19,038
Total assets at fair value |  | 19,438 | 19,038
Liabilities [Abstract] |  |  |
Derivatives | [1] | 0 | 0
Total liabilities at fair value |  | 0 | 0
Level 2 [Member] |  |  |
Assets [Abstract] |  |  |
Derivatives | [1] | 622 | 2,457
Trading securities |  | 0 | 0
Total assets at fair value |  | 622 | 2,457
Liabilities [Abstract] |  |  |
Derivatives | [1] | 1,444 | 2,127
Total liabilities at fair value |  | 1,444 | 2,127
Level 3 [Member] |  |  |
Assets [Abstract] |  |  |
Derivatives | [1] | 0 | 0
Trading securities |  | 0 | 0
Total assets at fair value |  | 0 | 0
Liabilities [Abstract] |  |  |
Derivatives | [1] | 0 | 0
Total liabilities at fair value |  | $ 0 | $ 0
[1] | Interest rate swaps are valued based on observable market swap rates.

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