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Shareholders' Equity (Share-based Compensation Activity) (Details) - $ / shares
shares in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Document Fiscal Year Focus 2018    
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Beginning Balance, Number of Shares 4    
Awarded, Number of Shares 0 0 0
Vested, Number of Shares (4)    
Ending Balance, Number of Shares 0 4  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Beginning Balance, Weighted Average Grant Date Fair Value per Share $ 10.84    
Vested, Weighted Average Grant Date Fair Value per Share 10.84    
Ending Balance, Weighted Average Grant Date Fair Value per Share $ 0.00 $ 10.84  
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Beginning Balance, Number of Shares 523    
Awarded, Number of Shares 350    
Vested, Number of Shares (206)    
Forfeited, Number of Shares (95)    
Ending Balance, Number of Shares 572 523  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Beginning Balance, Weighted Average Grant Date Fair Value per Share $ 3.71    
Awarded, Weighted Average Grant Date Fair Value per Share 2.90 $ 3.41 $ 2.30
Vested, Weighted Average Grant Date Fair Value per Share 4.51    
Forfeited, Weighted Average Grant Date Fair Value per Share 3.55    
Ending Balance, Weighted Average Grant Date Fair Value per Share $ 2.95 $ 3.71  
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Beginning Balance, Number of Shares 132    
Awarded, Number of Shares 182    
Forfeited, Number of Shares (36)    
Ending Balance, Number of Shares 278 132  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Beginning Balance, Weighted Average Grant Date Fair Value per Share $ 3.11    
Awarded, Weighted Average Grant Date Fair Value per Share 2.40    
Forfeited, Weighted Average Grant Date Fair Value per Share 2.74    
Ending Balance, Weighted Average Grant Date Fair Value per Share $ 2.69 $ 3.11