Derivative Financial Instruments Additional Details (Details) (USD $) In Thousands, unless otherwise specified														12 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009	Sep. 30, 2011 Derivative [Member]	Sep. 30, 2012 Interest Rate Contract [Member] Cash Flow Hedging [Member]	Sep. 30, 2011 Interest Rate Contract [Member] Cash Flow Hedging [Member]	Sep. 30, 2012 Foreign Exchange Contract [Member] Cash Flow Hedging [Member]	Sep. 30, 2011 Foreign Exchange Contract [Member] Cash Flow Hedging [Member]	Sep. 30, 2012 Foreign Exchange Contract [Member] Fair Value Hedging [Member]	Sep. 30, 2011 Foreign Exchange Contract [Member] Fair Value Hedging [Member]	Sep. 30, 2012 Commodity Contract [Member] Cash Flow Hedging [Member] T	Sep. 30, 2011 Commodity Contract [Member] Cash Flow Hedging [Member] T	Sep. 30, 2012 Remaining term 0.28 Years [Member] Interest Rate Contract [Member] Cash Flow Hedging [Member]	Sep. 30, 2011 Remaining term 0.28 Years [Member] Interest Rate Contract [Member] Cash Flow Hedging [Member]	Sep. 30, 2012 Remaining term 0.36 yeards [Member] Interest Rate Contract [Member] Cash Flow Hedging [Member]	Sep. 30, 2011 Remaining term 0.36 yeards [Member] Interest Rate Contract [Member] Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative Credit Risk Valuation Adjustment, Derivative Assets	$ 46	$ 18
Collateral Already Posted, Aggregate Fair Value	50	418
Letters of Credit Outstanding, Amount					2,000
Derivative, Nonmonetary Notional Amount												15	9
Derivative, Notional Amount						0		202,453	223,417	172,581	265,974	29,207	18,858		200,000		300,000
Derivative, Remaining Maturity														3 months 11 days		4 months 9 days
Accumulated other comprehensive loss	(33,435)	(14,446)	(7,497)	6,568			879	(1,409)	238			1,627	(686)
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months								(1,409)
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months								$ 796