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Stock-based Compensation (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Stock options
Sep. 30, 2012
Stock options
Mar. 31, 2013
Stock options
Amounts recognized in the condensed financial statements related to stock-based compensation              
Total cost of stock-based compensation charged against income before income tax $ 208,000 $ 289,000 $ 357,000 $ 438,000      
Amount of income tax benefit recognized in earnings 71,000 101,000 130,000 151,000      
Amount charged against net income 137,000 188,000 227,000 287,000      
Impact on net Income Per Common Share :              
Basic (in dollars per share) $ 0.04 $ 0.06 $ 0.07 $ 0.09      
Diluted (in dollars per share) $ 0.04 $ 0.05 $ 0.06 $ 0.08      
Number of Shares              
Outstanding at the beginning of the period (in shares)         416,125    
Stock options granted (in shares)         103,124    
Stock options forfeited (in shares)         (12,670)    
Stock options exercised (in shares)         (42,155)    
Outstanding at the end of the period (in shares)         464,424   416,125
Exercisable at the end of the period (in shares)         210,730    
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)         $ 52.09    
Stock options forfeited (in dollars per share)         $ 45.19    
Stock options exercised (in dollars per share)         $ 19.98    
Outstanding at the end of the period (in dollars per share)         $ 35.29   $ 29.87
Exercisable at the end of the period (in dollars per share)         $ 25.16    
Weighted- average Remaining Contractual Term              
Outstanding         4 years 3 months 18 days   3 years 8 months 12 days
Stock options granted         6 years    
Exercisable at the end of the period         3 years 3 months 18 days    
Aggregate Intrinsic Value              
Outstanding at the end of the period         15,009,000   9,529,000
Exercisable at the end of the period         8,946,000    
Intrinsic value of stock options exercised         1,710,000 1,300,000  
Unvested Shares              
Unvested at the beginning of the period (in shares)         257,805    
Stock options granted (in shares)         103,124    
Stock options forfeited (in shares)         (12,260)    
Stock options vested (in shares)         (94,975)    
Unvested at the end of the period (in shares)         253,694   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)         $ 12.27    
Stock options forfeited (in dollars per share)         $ 10.84    
Stock options vested (in dollars per share)         $ 8.45    
Unvested at the end of the period (in dollars per share)         $ 11.11   $ 9.55
Other stock option disclosures              
Unrecognized compensation cost         $ 1,908,000    
Number of shares available for future stock option grants         220,366