Derivative Instruments and Hedging Activities (Impact of Derivative Instruments on Earnings) (Details) (USD $) In Thousands	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Amount of (Income) Expense Recognized in Earnings on Derivative	$ 1,774	$ (526)	$ 226
Amount of (Gain) Loss Recognized in Accumulated OCI on Derivative	0	0	1,199
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings	229	282	237
Derivatives in Fair Value Hedging Relationships [Member] | Interest Expense [Member]
Amount of (Income) Expense Recognized in Earnings on Derivative	(67)	(127)	(184)
Amount of (Gain) Loss Recognized in Accumulated OCI on Derivative	0	0	0
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings	0	0	0
Derivatives in Cash Flow Hedging Relationships [Member] | Interest Expense [Member]
Amount of (Income) Expense Recognized in Earnings on Derivative	229	282	237
Amount of (Gain) Loss Recognized in Accumulated OCI on Derivative	0	0	1,199
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings	229	282	237
Derivatives in Foreign Currency Relationships [Member] | Other (Income) Expense [Member]
Amount of (Income) Expense Recognized in Earnings on Derivative	1,612	(681)	173
Amount of (Gain) Loss Recognized in Accumulated OCI on Derivative	0	0	0
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings	$ 0	$ 0	$ 0