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Stock-Based Compensation Plans - Summary of Stock Activity (Details) (USD $)
 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Options outstanding at beginning of period 606,025 633,900 713,790  
Options granted 31,690 29,160 27,210  
Options exercised 153,505 54,035 107,100  
Options forfeited 3,000 3,000 0  
Options outstanding at end of period 481,210 606,025 633,900 713,790
Options outstanding weighted average exercise price at beginning of period $ 14.96 $ 14.00 $ 12.23  
Options outstanding weighted average exercise price - Granted $ 22.25 $ 25.60 $ 32.16  
Options outstanding weighted average exercise price - Exercised $ 8.62 $ 9.95 $ 6.83  
Options outstanding weighted average exercise price - forfeited $ 5.78 $ 5.84 $ 0  
Options outstanding weighted average exercise price at end of period $ 17.52 $ 14.96 $ 14.00 $ 12.23
Options outstanding weighted average remaining term 3.8 3.5 4.1 4.5
Options outstanding weighted average grant date fair value at beginning of period $ 4,216 $ 4,206 $ 4,246  
Options outstanding weighted average grant date fair value 281 293 349  
Options exercised weighted average grant date fair value 705 274 389  
Options forfeited weighted average grant date fair value 10 9 0  
Options outstanding weighted average grant date fair value at end of period 3,782 4,216 4,206 4,246
Options exerciseable at September 30, 2012 410,766      
Options exerciseable weighted average exercise price $ 16.18      
Options exerciseable weighted average remaining term 3.0      
Options exerciseable weighted average grant date fair value 3,035      
Options vested during twelve months ended September 30, 2012 35,574      
Options vested weighted average grant date fair value $ 370