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Share-Based Payments - Restricted Stock Units (Details) - Restricted Stock Units - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Restricted stock (in shares)      
Granted (in shares) 28,000 20,000 27,000
Vested (in shares) (28,000)    
Restricted Stock (in dollars per share)      
Granted (in dollars per share) $ 24.10    
Vested (in dollars per share) $ 24.10    
Restricted stock (in years)      
Vesting period 1 year    
Restricted stock units, retention period 6 months    
Total unrecognized compensation costs $ 0.0    
Maximum      
Restricted stock (in years)      
Vesting period 1 year