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Stock-based Compensation (Details) (USD $)
 3 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2013
Amounts recognized in the condensed financial statements related to stock-based compensation      
Total cost of stock-based compensation charged against income before income tax $ 149,000 $ 149,000  
Amount of income tax benefit recognized in earnings 57,000 51,000  
Amount charged against net income 92,000 98,000  
Impact on net income per common share:      
Basic (in dollars per share) $ 0.03 $ 0.03  
Diluted (in dollars per share) $ 0.03 $ 0.03  
Stock options
      
Assumptions used to estimate the fair value of options granted      
Volatility (as a percent) 28.70% 31.10%  
Risk-free interest rate, minimum (as a percent) 0.80% 0.60%  
Risk-free interest rate, maximum (as a percent) 1.20% 1.00%  
Dividend yield (as a percent) 1.10% 1.50%  
Number of Shares      
Outstanding at the beginning of the period (in shares) 416,125    
Stock options granted (in shares) 101,124    
Stock options forfeited (in shares) (6,569)    
Stock options exercised (in shares) (11,320)    
Outstanding at the end of the period (in shares) 499,360   416,125
Exercisable at the end of the period (in shares) 237,215    
Weighted-average Exercise Price per Share      
Outstanding at the beginning of the period (in dollars per share) $ 29.87    
Stock options granted (in dollars per share) $ 51.85    
Stock options forfeited (in dollars per share) $ 42.84    
Stock options exercised (in dollars per share) $ 22.43    
Outstanding at the end of the period (in dollars per share) $ 34.31   $ 29.87
Exercisable at the end of the period (in dollars per share) $ 24.26    
Weighted- average Remaining Contractual Term      
Outstanding 4 years 3 months 18 days   3 years 8 months 12 days
Stock options granted 6 years 2 months 12 days    
Exercisable at the end of the period 3 years 2 months 12 days    
Aggregate Intrinsic Value      
Outstanding at the end of the period 9,893,000   9,529,000
Exercisable at the end of the period 7,086,000    
Intrinsic value of stock options exercised 329,000 851,000  
Unvested Shares      
Unvested at the beginning of the period (in shares) 257,805    
Stock options granted (in shares) 101,124    
Stock options forfeited (in shares) (6,199)    
Stock options vested (in shares) (90,585)    
Unvested at the end of the period (in shares) 262,145   257,805
Weighted-average Grant-Date Fair Value      
Unvested at the beginning of the period (in dollars per share) $ 9.55    
Stock options granted (in dollars per share) $ 11.93    
Stock options forfeited (in dollars per share) $ 9.91    
Stock options vested (in dollars per share) $ 6.92    
Unvested at the end of the period (in dollars per share) $ 11.44   $ 9.55
Other stock option disclosures      
Unrecognized compensation cost $ 2,747,000    
Number of shares available for future stock option grants 216,265    
Stock options | Minimum
      
Assumptions used to estimate the fair value of options granted      
Expected stock option life 5 years 5 years  
Stock options | Maximum
      
Assumptions used to estimate the fair value of options granted      
Expected stock option life 10 years 10 years