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Stock-based Compensation (Details) (USD $)
 3 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Mar. 31, 2012
Amounts recognized in the condensed financial statements related to stock-based compensation      
Total cost of stock-based compensation charged against income before income taxes $ 149,000 $ 96,000  
Amount of income tax benefit recognized in earnings 51,000 35,000  
Amount charged against net income 98,000 61,000  
Impact on net income per common share:      
Basic (in dollars per share) $ 0.03 $ 0.02  
Diluted (in dollars per share) $ 0.03 $ 0.02  
Stock options
      
Assumptions used to estimate the fair value of options granted      
Volatility (as a percent) 31.10% 33.40%  
Risk-free interest rate, minimum (as a percent) 0.60% 2.20%  
Risk-free interest rate, maximum (as a percent) 1.00% 3.60%  
Dividend yield (as a percent) 1.50% 1.70%  
Number of Shares      
Outstanding at the beginning of the period (in shares) 433,785    
Options granted (in shares) 103,880    
Options forfeited (in shares) (7,900)    
Options exercised (in shares) (29,780)    
Outstanding at the end of the period (in shares) 499,985   433,785
Exercisable at the end of the period (in shares) 210,305    
Weighted-average Exercise Price per Share      
Outstanding at the beginning of the period (in dollars per share) $ 22.77    
Options granted (in dollars per share) $ 50.20    
Options forfeited (in dollars per share) $ 30.36    
Options exercised (in dollars per share) $ 20.79    
Outstanding at the end of the period (in dollars per share) $ 28.46   $ 22.77
Exercisable at the end of the period (in dollars per share) $ 20.86    
Weighted- average Remaining Contractual Term      
Outstanding 4 years 3 months 18 days   3 years 10 months 24 days
Options granted 6 years 2 months 12 days    
Exercisable at the end of the period 3 years 3 months 18 days    
Aggregate Intrinsic Value      
Outstanding at the end of the period 9,016,000    
Exercisable at the end of the period 1,805,000    
Weighted average grant date fair value of option granted and intrinsic value of option exercised      
Intrinsic value of options exercised 851,000 495,000  
Number of Shares      
Unvested at the beginning of the period (in shares) 284,875    
Options granted (in shares) 103,880    
Options forfeited (in shares) (7,900)    
Options vested (in shares) (91,175)    
Unvested at the end of the period (in shares) 289,680   284,875
Weighted-average Grant-Date Fair Value      
Unvested at the beginning of the period (in dollars per share) $ 7.23    
Options granted (in dollars per share) $ 12.37    
Options forfeited (in dollars per share) $ 7.86    
Options vested (in dollars per share) $ 6.80    
Unvested at the end of the period (in dollars per share) $ 9.19   $ 7.23
Unrecognized compensation cost      
Unrecognized compensation cost $ 1,918,000    
Weighted average period of recognition 3 years    
Stock options | Minimum
      
Assumptions used to estimate the fair value of options granted      
Expected option life (years) 5 years 5 years  
Stock options | Maximum
      
Assumptions used to estimate the fair value of options granted      
Expected option life (years) 10 years 10 years