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Derivative Financial Instruments (Derivative Instruments and Hedging Activities Disclosure) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Derivative [Line Items]      
Net realized and unrealized gain or (loss) (excluding the underlying foreign currency exposure being hedged) $ (7,500) $ 1,800 $ 500
Gain or (Loss) Recognized in OCI-Effective Portion 1,445 (758) (3,375)
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Gain or (Loss) Recognized in OCI-Effective Portion 1,652 (866)  
Gain or (Loss) Reclassified from OCI into Income-Effective Portion (552) (524)  
Gain or (Loss) Recognized-Ineffective Portion 21 (49)  
Other Income (Expense) [Member] | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Net realized and unrealized gain or (loss) (excluding the underlying foreign currency exposure being hedged) $ 9,720 $ (870) $ 883