Accumulated Other Comprehensive Income Components (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance	$ (12,393)	$ 38,878
Other comprehensive income (loss) before reclassifications	(123,827)	(370)
Amounts reclassified from accumulated other comprehensive income	8,132	(1,674)
Net current-period other comprehensive income (loss)	(115,695)	(2,044)
Accumulated other comprehensive income (loss), ending balance	(128,088)	36,834
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance	7,662	5,448
Other comprehensive income (loss) before reclassifications	(101)	2,369
Amounts reclassified from accumulated other comprehensive income	(4)	(227)
Net current-period other comprehensive income (loss)	(105)	2,142
Accumulated other comprehensive income (loss), ending balance	7,557	7,590
Accumulated Net Gain (Loss) from Interest Rate Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance	(18,381)	37,906
Other comprehensive income (loss) before reclassifications	(84,824)	(14,448)
Amounts reclassified from accumulated other comprehensive income	368	1,343
Net current-period other comprehensive income (loss)	(84,456)	(13,105)
Accumulated other comprehensive income (loss), ending balance	(102,837)	24,801
Accumulated Net Gain (Loss) from Commodity Contracts Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance	(1,674)	(4,476)
Other comprehensive income (loss) before reclassifications	(38,902)	11,709
Amounts reclassified from accumulated other comprehensive income	7,768	(2,790)
Net current-period other comprehensive income (loss)	(31,134)	8,919
Accumulated other comprehensive income (loss), ending balance	$ (32,808)	$ 4,443

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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