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Stock-Based Compensation Plans (Tables) - Summary of Stock Activity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Dec. 31, 2012
Years
Sep. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Options outstanding at October 1, 2012 481,210  
Options granted 46,180  
Options exercised 70,800  
Options outstanding at December 31, 2012 456,590  
Options outstanding weighted average exercise price-beginning balance $ 17.52  
Options outstanding weighted average exercise price - Granted $ 26.20  
Options outstanding weighted average exercise price - Exercised $ 10.78  
Options outstanding weighted average exercise price - Ending balance $ 19.45  
Options outstanding weighted average remaining term 4.5 3.8
Options outstanding weighted average grant date fair value - beginning balance $ 3,782  
Options granted weighted average grant date fair value 489  
Options exercised weighted average grant date fair value 388  
Options outstanding weighted average grant date fair value - ending balance 3,883  
Options exercisable at December 31, 2012 360,578  
Options exerciseable weighted average exercise price $ 17.81  
Options exerciseable weighted average remaining term 3.5  
Options exerciseable weighted average grant date fair value 2,847  
Options vested during three months ended December 31, 2012 20,612  
Options vested weighted average grant date fair value $ 199