XML 101 R85.htm IDEA: XBRL DOCUMENT v3.8.0.1
Stock-based Compensation Plans (Schedule of Share-based Compensation. Option Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding, shares 3,554,308 3,992,666 4,552,235  
Outstanding, Weighted average exercise price (per share) $ 5.72 $ 5.99 $ 6.54 $ 6.37
Outstanding, Weighted average remaining contractual term, years 2 years 6 months 3 years 5 months 4 years 2 months 5 years
Outstanding, Aggregate intrinsic value $ 17.3 $ 23.8 $ 9.3 $ 13.6
Granted, shares     97,119  
Granted, Weighted average exercise price (per share)     $ 9.97  
Exercised, shares (905,834) (270,599) (506,632)  
Exercised, Weighted average exercise price (per share) $ 4.71 $ 6.83 $ 3.42  
Exercised, Aggregate intrinsic value $ 7.3 $ 0.8 $ 3.2  
Canceled, shares (207,820) (167,759) (150,056)  
Canceled, Weighted average exercise price (per share) $ 14.72 $ 17.82 $ 13.90  
Stock Options, Exercisable, Number 2,415,475      
Exercisable, Weighted average exercise price (per share) $ 5.67      
Exercisable, Weighted average remaining contractual term, years 2 years 6 months      
Exercisable, Aggregate intrinsic value $ 17.2      
Expected to vest in subsequent periods, shares 25,179      
Expected to vest in subsequent periods, Weighted average exercise price (per share) $ 9.97      
Expected to vest in subsequent periods, Weighted average remaining contractual term, years 7 years 3 months      
Expected to vest in subsequent periods, Aggregate intrinsic value $ 0.1      
Outstanding, shares 2,440,654 3,554,308 3,992,666 4,552,235