Accumulated Other Comprehensive Income Components (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance	$ (12,393)	$ 38,878
Other comprehensive income (loss) before reclassifications	(81,874)	21,890
Amounts reclassified from accumulated other comprehensive income	68	2,264
Net current-period other comprehensive income (loss)	(81,806)	24,154
Accumulated other comprehensive income (loss), ending balance	(94,199)	63,032
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	(1,063)	2,394
Amounts reclassified from accumulated other comprehensive income	(4)	0
Net current-period other comprehensive income (loss)	(1,067)	2,394
Accumulated other comprehensive income (loss), ending balance	6,595	7,842
Accumulated Net Gain (Loss) from Interest Rate Hedges [Member] [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	(52,069)	13,270
Amounts reclassified from accumulated other comprehensive income	282	672
Net current-period other comprehensive income (loss)	(51,787)	13,942
Accumulated other comprehensive income (loss), ending balance	(70,168)	51,848
Accumulated Net Gain (Loss) from Commodity Contracts Cash Flow Hedges [Member] [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	(28,742)	6,226
Amounts reclassified from accumulated other comprehensive income	(210)	1,592
Net current-period other comprehensive income (loss)	(28,952)	7,818
Accumulated other comprehensive income (loss), ending balance	$ (30,626)	$ 3,342

- 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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