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Fair Value Measurements - Schedule of Fair Value by Balance Sheet Grouping (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Sep. 30, 2013	Mar. 31, 2013
Offsetting Derivatives Table
Derivative Asset, Fair Value, Gross Asset	$ 3,526	$ 92	$ 12,241
Derivative Asset Offset Amount	(305)	(49)	(3,713)
Derivative Assets, Fair Value, Net Amount	3,221	43	8,528
Derivative Liabilities, Fair Value, Gross	(677)	(6,726)	(33,478)
Derivative Liability Offset Amount	305	49	3,713
Derivative Liabilities, Net Amount	$ (372)	$ (6,677)	$ (29,765)

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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