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Stock-based Compensation (Details) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Stock Options [Member]
Mar. 31, 2013
SSARs / Stock Options [Member]
Mar. 31, 2013
SSARs / Stock Options [Member]
Mar. 31, 2013
Nonvested Stock Awards [Member]
Sep. 30, 2012
Nonvested Stock Awards [Member]
Mar. 31, 2013
Performance Shares [Member]
Mar. 31, 2013
Nonvested Stock Awards and Performance Shares [Member]
Mar. 31, 2013
Nonvested Stock Awards and Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock Surrendered During Period, Value   $ 19,000 $ 34,000                
Total stock-based compensation included in general and administrative expenses 900,000                    
Total stock-based compensation included in general and administrative expenses, net of tax 700,000                    
Number of shares surrendered by emloyees (shares)   1,306 12,553                
Intrinsic value of SSAR/stock options outstanding         900,000 900,000          
Aggregate intrinsic value of SSARs/stock options vested and expected to vest         900,000 900,000          
SSARs/stock options weighted average expected life         2 years 10 months 24 days            
Unrecognized compensation costs related to non-vested stock awards             1,800,000 2,100,000      
Number of shares of performance-based restricted stock issued (shares)                 31,532    
Weighted average period to recognize remaining cost             1 year 3 months 18 days        
Increase in target number of Performance Shares (percent)                 50.00%    
Non-vested stock performance period (years)                 3 years    
Expected dividend yield on performance shares (percent)                 0.00%    
Expected volatility rate range minimum (percent)                 35.60%    
Expected volatility rate range maximum (percent)                 60.40%    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions [Abstract]                      
Expected life of options       5 years              
Expected volatility       46.15%              
Expected discrete dividends       0              
Weighted average risk-free interest rate       0.63%         0.34%    
Weighted average fair value       $ 5.39              
Share-based Compensation Arrangement by Share-based Payment Award, Outstanding [Roll Forward]                      
Shares outstanding at beginning of period (shares)         581,857 429,965          
Granted (shares)         $ 200,000 $ 200,000          
Expired (shares)         (6,000) (7,703)          
Forfeited (shares)         (1,587) (3,557)          
Shares outstanding at end of period (shares)         574,165 574,165          
Exercisable at end of period         295,087 295,087          
Vested or expected to vest in the future (shares)         573,378 573,378          
Share-based Compensation Arrangement by Share-based Payment Award, Outstanding, Weighted Average Exercise Price [Roll Forward]                      
Weighted average exercise price of shares outstanding at beginning of period         $ 33.35 $ 40.80          
Weighted average exercise price of shares granted         $ 0.00 $ 13.33          
Weighted average exercise price of shares expired         $ 94.25 $ 96.45          
Weighted average exercise price of shares forfeited         $ 18.89 $ 19.90          
Weighted average exercise price of shares outstanding at beginning of period         $ 32.75 $ 32.75          
Weighted average exercise price of shares exercisable at end of period         $ 49.50 $ 49.50          
Weighted average exercise price of shares vested or expected to vest in the future         $ 32.78 $ 32.78          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                      
Shares outstanding at beginning of period (shares)                   381,181 323,335
Granted (shares)         0 155,565       717 93,309
Shares vested (shares)                   0 (31,653)
Shares forfeited (shares)                   (7,145) (10,238)
Shares outstanding at end of period (shares)                   374,753 374,753
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Weighted average grant date fair value of shares outstanding at beginning of period                   $ 18.10 $ 19.61
Weighted average grant date fair value of shares granted                 $ 5.02 $ 18.82 $ 10.32
Weighted average grant date fair value of shares vested in period                   $ 0.00 $ 10.80
Weighted average grant date fair value of shares forfeited in period                   $ 13.25 $ 14.14
Weighted average grant date fair value of shares outstanding at end of period                   $ 18.19 $ 18.19