Derivative Instruments and Hedging Activities (Unrecognized Gains and Losses and Recognized Gains Associated with Derivative Instruments in Balance Sheet) (Details) (Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Sep. 30, 2011
Unrecognized gain (loss)	$ (693)	$ (778)
Accumulated Other Comprehensive Earnings [Member]
Unrecognized gain (loss)	(693)	(781)
Current and Long-Term Debt [Member]
Unrecognized gain (loss)	$ 0	$ 3