Derivative Instruments and Hedging Activities (Impact of Derivative Instruments on Earnings) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Income) Expense Recognized in Earnings on Derivative		$ (72)	$ 21	$ 99
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings		$ (72)	$ 21	$ 99
Interest Expense [Member] | Derivatives in Cash Flow Hedging Relationships [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Gain) Loss Recognized in Accumulated OCI on Derivative	$ 507