Disclosures About Derivative Instruments and Hedging Activities (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Interest rate contracts [Member] | Interest expense/other income, net [Member] | Cash Flow Hedges [Member]
Effects of derivative instruments on the Condensed Consolidated Statements of Income and changes in AOCI and noncontrolling interest
Gain or (loss) recognized in AOCI	$ (11,573)	$ (2,779)	$ (10,147)	$ (5,047)
Gain (loss) reclassified from AOCI into income	(484)	(291)	(1,748)	(873)
Derivatives Not Designated as Hedging Instruments [Member] | Commodity contracts [Member] | Operating expenses [Member]
Effects of derivative instruments on the Condensed Consolidated Statements of Income and changes in AOCI and noncontrolling interest
Gain (Loss) recognized in income	(127)	(3)
Derivatives Not Designated as Hedging Instruments [Member] | Commodity contracts [Member] | Operating expenses/other income, net [Member]
Effects of derivative instruments on the Condensed Consolidated Statements of Income and changes in AOCI and noncontrolling interest
Gain (Loss) recognized in income			$ 78	$ 348