Financial Instruments Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013		Sep. 30, 2012
Other Comprehensive Income [Abstract]
Interest rate agreements fair value	$ 79,963		$ (11,458)
Forward commodity contracts fair value	(2,057)		(30,366)
Interest rate agreements	2,216		1,342
Forward commodity contracts	6,576		38,232
Total other comprehensive income (loss) from hedging, net of tax	86,698	[1]	(2,250)	[1]
Expected Earnings [Line Items]
2014	(6,434)
2015	(1,229)
2016	(797)
2017	(844)
2018	(967)
Thereafter	(24,569)
Cash Flow Hedge Gain (Loss) To Be Reclassiflied, Total	(34,840)	[1]
Interest Rate Contract [Member]
Expected Earnings [Line Items]
2014	(2,686)
2015	(804)
2016	(634)
2017	(735)
2018	(936)
Thereafter	(24,569)
Cash Flow Hedge Gain (Loss) To Be Reclassiflied, Total	(30,364)	[1]
Commodity Contract [Member]
Expected Earnings [Line Items]
2014	(3,748)
2015	(425)
2016	(163)
2017	(109)
2018	(31)
Thereafter	0
Cash Flow Hedge Gain (Loss) To Be Reclassiflied, Total	$ (4,476)	[1]

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