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Stock-Based Compensation Plans - Summary of Stock Options Outstanding (Details)
12 Months Ended
Sep. 30, 2015
Years
$ / shares
shares
Sep. 30, 2014
Years
$ / shares
Sep. 30, 2013
Years
$ / shares
Sep. 30, 2012
Years
$ / shares
Shares under option | shares 305,750      
Weighted average exercise price $ 21.90 $ 25.43 $ 20.40 $ 17.52
Weighted average remaining life | Years 5.9 5.0 4.2 3.8
$16.51 - $24.75        
Shares under option | shares 54,117      
Weighted average exercise price $ 17.63      
Weighted average remaining life | Years 4.8      
Minimum exercise price $ 16.51      
Maximum exercise price $ 24.75      
$24.76 - $37.25        
Shares under option | shares 147,018      
Weighted average exercise price $ 21.18      
Weighted average remaining life | Years 4.8      
$37.26 - $41.39        
Shares under option | shares 12,712      
Weighted average exercise price $ 31.10      
Weighted average remaining life | Years 8.2      
Minimum exercise price $ 37.26      
Maximum exercise price $ 41.39      
$16.51 - $24.75 Non-exercisable        
Shares under option | shares 11,078      
Weighted average exercise price $ 16.72      
Weighted average remaining life | Years 6.2      
Minimum exercise price $ 16.51      
Maximum exercise price $ 24.75      
$24.76 - $37.25 Non-exercisable        
Shares under option | shares 59,977      
Weighted average exercise price $ 23.30      
Weighted average remaining life | Years 8.0      
Minimum exercise price $ 24.76      
Maximum exercise price $ 37.25      
$37.26 - $41.39 Non-exercisable        
Shares under option | shares 20,848      
Weighted average exercise price $ 31.10      
Weighted average remaining life | Years 8.2      
Exercisable        
Shares under option | shares 213,847      
Weighted average exercise price $ 20.87      
Weighted average remaining life | Years 5.0      
Non-exercisable        
Shares under option | shares 91,903      
Weighted average exercise price $ 24.27      
Weighted average remaining life | Years 7.8      
$24.76 - $37.25        
Minimum exercise price $ 24.76      
Maximum exercise price 37.25      
$37.26 - $41.39 Non-exercisable        
Minimum exercise price 37.26      
Maximum exercise price $ 41.39