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- Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares surrendered by employees (shares)   62,330 30,018  
Payments related to tax withholding for share-based compensation   $ 1.3 $ 0.4  
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 $ 1.6 $ 1.6    
Aggregate intrinsic value of exercisable stock options 1.6 1.6    
Intrinsic value of options exercisable 1.0 1.0    
Unrecognized compensation costs related to non-vested stock options award $ 0.3 $ 0.3   $ 0.3
Weighted average period to recognize remaining cost   1 year 11 months 27 days    
Granted (shares) 0 23,680    
Award vesting period   3 years    
Expected dividends   0.00%    
Risk free interest rate   2.06%    
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)   211,165    
Granted (in dollars per share)   $ 20.20    
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted restricted stock (shares)   376,250    
Granted (in dollars per share)   $ 21.17    
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)   $ 22.40    
Expected dividends   0.00%    
Expected volatility rate range minimum (percent)   21.10%    
Expected volatility rate range maximum (percent)   50.00%    
Risk free interest rate   1.81%    
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 2 days    
Unrecognized compensation costs related to non-vested stock awards $ 12.9 $ 12.9   $ 8.8
Total Shareholder Return Performance Share | 2017 Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Payout percentage   20.00%