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- Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares surrendered by employees (shares) 62,231 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 $ 2.9    
Aggregate intrinsic value of exercisable stock options 2.9    
Intrinsic value of options exercisable 1.9    
Unrecognized compensation costs related to non-vested stock options award $ 0.4   $ 0.3
Weighted average period to recognize remaining cost 2 years 11 days    
Granted (shares) 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) 189,372    
Granted (in dollars per share) $ 20.46    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted restricted stock (shares) 334,118    
Granted (in dollars per share) $ 21.30    
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 11 months 19 days    
Unrecognized compensation costs related to non-vested stock awards $ 14.7   $ 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%