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Derivative Financial Instruments Derivative Financial Instruments (Derivative Instruments and Hedging Activities Disclosure) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Derivative [Line Items]      
Net realized and unrealized gain or (loss) (excluding the underlying foreign currency exposure being hedged) $ (1,800) $ (500) $ 600
Gain or (Loss) Recognized in OCI-Effective Portion (758) (3,375) 0
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Gain or (Loss) Recognized in OCI-Effective Portion (866) (3,859)  
Gain or (Loss) Reclassified from OCI into Income-Effective Portion (524) (2,436)  
Gain or (Loss) Recognized-Ineffective Portion (49) (24)  
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) $ (870) $ 883 $ (615)