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Equity (Performance Stock Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Performance Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unamortized stock-based compensation expense $ 1,700    
Weighted average remaining service period (in years) 1 year 10 months 24 days    
Unvested stock units (in shares) 471,824 397,777  
Intrinsic value of non-vested and expected to vest PSUs $ 1,400    
Average remaining contractual term (in years) 1 year 10 months 6 days    
Vested (in shares) 30,874   0
Intrinsic value vested $ 200 $ 1,400  
Weighted average fair value (in usd per share) $ 5.19 $ 7.62  
Performance Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unamortized stock-based compensation expense $ 9    
Weighted average remaining service period (in years) 18 days    
Unvested stock units (in shares) 33,333 33,333  
Vested (in shares) 0    
Weighted average fair value (in usd per share) $ 0.00