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- Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation included in general and administrative expenses $ 1,600,000 $ 4,600,000    
Total stock-based compensation included in general and administrative expenses, net of tax 1,200,000 $ 3,400,000    
Number of shares surrendered by employees (shares)   10,302 23,602  
Payments Related to Tax Withholding for Share-based Compensation   $ 192,000 $ 450,000  
SSARs / Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Intrinsic value of SSAR/stock options outstanding 2,100,000 $ 2,100,000    
SSARs/stock options weighted average expected life   2 years 2 months    
Aggregate intrinsic value of exercisable SSARs/stock options 1,700,000 $ 1,700,000    
Nonvested Stock Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation costs related to non-vested stock awards $ 13,200,000 $ 13,200,000   $ 10,000,000
Weighted average period to recognize remaining cost   2 years 8 months 12 days    
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares of performance-based restricted stock issued (shares)   201,157    
Non-vested stock performance period (years)   3 years    
Award vesting period   3 years    
Granted   $ 19.90    
Expected dividend yield on performance shares (percent)   0.00%    
Expected volatility rate range minimum (percent)   29.00%    
Expected volatility rate range maximum (percent)   185.80%    
Risk free interest rate   0.94%    
Minimum | Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percent of target number   0.00%    
Maximum | Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percent of target number   150.00%    
Pre-tax Income Performance Shares | Minimum | Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity instruments other than options, payout percent   50.00%    
Pre-tax Income Performance Shares | Maximum | Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity instruments other than options, payout percent   200.00%