Financial Instruments Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014		Sep. 30, 2013
Other Comprehensive Income [Abstract]
Interest rate agreements fair value	$ (58,973)		$ 79,963
Forward commodity contracts fair value	7,904		(2,057)
Interest rate agreements	2,686		2,216
Forward commodity contracts	(5,102)		6,576
Total other comprehensive income (loss) from hedging, net of tax	(53,485)	[1]	86,698	[1]
Expected Earnings [Line Items]
2015	(1,436)
2016	(1,541)
2017	(842)
2018	(974)
2019	(951)
Thereafter	(23,609)
Cash Flow Hedge Gain (Loss) To Be Reclassiflied, Total	(29,353)	[1]
Interest Rate Contract [Member]
Expected Earnings [Line Items]
2015	(804)
2016	(634)
2017	(735)
2018	(936)
2019	(961)
Thereafter	(23,609)
Cash Flow Hedge Gain (Loss) To Be Reclassiflied, Total	(27,679)	[1]
Commodity Contract [Member]
Expected Earnings [Line Items]
2015	(632)
2016	(907)
2017	(107)
2018	(38)
2019	10
Thereafter	0
Cash Flow Hedge Gain (Loss) To Be Reclassiflied, Total	$ (1,674)	[1]

[1] Utilizing an income tax rate ranging from approximately 37 percent to 39 percent based on the effective rates in each taxing jurisdiction.