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- Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares surrendered by employees (shares)   30,018 14,673  
Payments related to tax withholding for share-based compensation   $ 387,000 $ 137,000  
2017 Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Service period   3 years    
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Intrinsic value of stock options outstanding $ 465,909 $ 465,909    
Aggregate intrinsic value of exercisable stock options 447,547 447,547    
Intrinsic value of options exercisable $ 140,433 $ 140,433    
Unrecognized compensation costs related to non-vested stock options award       $ 400,000
Weighted average period to recognize remaining cost   1 year 9 months 29 days    
Granted (shares) 2,300 29,410    
Award vesting period   3 years    
Expected dividends   0.00%    
Risk free interest rate   1.85%    
Employee purchase plan (EOP)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period   2 years    
Time Based Restricted Stock Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period   3 years    
Granted restricted stock (shares)   269,402    
Granted (in dollars per share)   $ 12.51    
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted restricted stock (shares)   533,098    
Granted (in dollars per share)   $ 13.05    
Restricted Stock | 2017 Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period   3 years    
Granted (in dollars per share)   $ 13.60    
Expected dividends   0.00%    
Expected volatility rate range minimum (percent)   32.60%    
Expected volatility rate range maximum (percent)   66.00%    
Risk free interest rate   1.30%    
Restricted Stock | 2017 Performance Shares | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Payout percentage 0.00%      
Restricted Stock | 2017 Performance Shares | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Payout percentage 175.00%      
Nonvested Stock Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average period to recognize remaining cost   1 year 10 months    
Unrecognized compensation costs related to non-vested stock awards $ 13,500,000 $ 13,500,000   $ 11,000,000
Total Shareholder Return Performance Share | 2017 Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Payout percentage 20.00%