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Common Shareholders' Equity (Share-based Compensation Activity) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Document Fiscal Year Focus 2017    
Preferred stock, shares issued 700,000 700,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs   $ 1.2  
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 58,000    
Awarded, Number of Shares 0 0 0
Vested, Number of Shares (53,000)    
Forfeited, Number of Shares (1,000)    
Ending Balance, Number of Shares 4,000 58,000  
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 $ 12.38    
Vested, Weighted Average Grant Date Fair Value per Share 12.49    
Forfeited, Weighted Average Grant Date Fair Value per Share 12.64    
Ending Balance, Weighted Average Grant Date Fair Value per Share $ 10.84 $ 12.38  
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 958,000    
Awarded, Number of Shares 34,000    
Vested, Number of Shares (381,000)    
Forfeited, Number of Shares (88,000)    
Ending Balance, Number of Shares 523,000 958,000  
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 $ 4.61    
Awarded, Weighted Average Grant Date Fair Value per Share 3.41 $ 2.30 $ 4.49
Vested, Weighted Average Grant Date Fair Value per Share 5.86    
Forfeited, Weighted Average Grant Date Fair Value per Share 4.02    
Ending Balance, Weighted Average Grant Date Fair Value per Share $ 3.71 $ 4.61  
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 0    
Awarded, Number of Shares 132,000    
Ending Balance, Number of Shares 132,000 0  
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 $ 0.00    
Awarded, Weighted Average Grant Date Fair Value per Share 3.11    
Ending Balance, Weighted Average Grant Date Fair Value per Share $ 3.11 $ 0.00  
Series A Preferred Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Preferred stock, shares issued 700,000 700,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Preferred Stock, Dividend Rate, Percentage 7.50%    
Preferred Stock, Dividend Payment Rate, Variable If we do not pay a Cash Dividend, the liquidation preference shall be increased to an amount equal to the current liquidation preference in effect plus an amount reflecting that liquidation preference multiplied by the Cash Dividend rate then in effect plus 2.0% per year (Accrued Dividend).