Derivative Instruments and Hedging Activities (Unrecognized Gains and Losses and Recognized Gains Associated with Derivative Instruments in Balance Sheet) (Details) (USD $) In Thousands	Jun. 30, 2011	Sep. 30, 2010
Designated as Hedging Instrument [Member]
Unrecognized gain (loss)	$ (820)	$ (941)
Designated as Hedging Instrument [Member] | Accumulated Other Comprehensive Earnings [Member]
Unrecognized gain (loss)	(839)	(1,011)
Designated as Hedging Instrument [Member] | Current and Long-Term Debt [Member]
Unrecognized gain (loss)	19	70
Other Current Assets [Member]
Recognized gain		$ 579