Disclosures About Derivative Instruments and Hedging Activities (Details 1) (Cash Flow Hedging [Member], USD $) In Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in AOCI and Noncontrolling Interest	$ 1,248	$ (20,280)	$ 26,525	$ 12,443
Gain (Loss) Reclassified from AOCI and Noncontrolling Interest into Income	9,507	4,474	28,838	25,971
Commodity Contract [Member] | Cost of sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from AOCI and Noncontrolling Interest into Income	9,642	4,609	29,242	38,568
Commodity Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in AOCI and Noncontrolling Interest	1,248	(20,280)	26,525	10,704
Interest rate contracts [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from AOCI and Noncontrolling Interest into Income	(135)		(404)
Interest rate contracts [Member] | Interest Expense/Other Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from AOCI and Noncontrolling Interest into Income		(135)		(12,597)
Interest rate contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in AOCI and Noncontrolling Interest				$ 1,739