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Stock-based Compensation (Details) (USD $)
 3 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Nov. 30, 2012
Stock options
Dec. 31, 2012
Stock options
Dec. 31, 2013
Stock options
Dec. 31, 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 $ 272,000 $ 459,000 $ 629,000 $ 897,000          
Amount of income tax benefit recognized in earnings 98,000 163,000 228,000 314,000          
Amount charged against net income 174,000 296,000 401,000 583,000          
Impact on net Income Per Common Share :                  
Basic (in dollars per share) $ 0.05 $ 0.09 $ 0.12 $ 0.17          
Diluted (in dollars per share) $ 0.05 $ 0.08 $ 0.11 $ 0.17          
Number of Shares                  
Outstanding at the beginning of the period (in shares)             416,125    
Stock options granted (in shares)             128,124    
Stock options forfeited (in shares)             (17,680)    
Stock options exercised (in shares)             (66,140)    
Outstanding at the end of the period (in shares)             460,429   416,125
Exercisable at the end of the period (in shares)             192,570    
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)             $ 55.33    
Stock options forfeited (in dollars per share)             $ 44.21    
Stock options exercised (in dollars per share)             $ 21.85    
Outstanding at the end of the period (in dollars per share)             $ 37.57   $ 29.87
Exercisable at the end of the period (in dollars per share)             $ 25.59    
Weighted- average Remaining Contractual Term                  
Outstanding             4 years 4 months 24 days   3 years 8 months 12 days
Stock options granted             6 years 3 months 18 days    
Exercisable at the end of the period             3 years 1 month 6 days    
Aggregate Intrinsic Value                  
Outstanding at the end of the period             18,884,000   9,529,000
Exercisable at the end of the period             10,204,000    
Intrinsic value of stock options exercised             2,889,000 1,800,000  
Unvested Shares                  
Unvested at the beginning of the period (in shares)             257,805    
Stock options granted (in shares)             128,124    
Stock options forfeited (in shares)             (17,270)    
Stock options vested (in shares)             (100,800)    
Unvested at the end of the period (in shares)             267,859   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)             $ 15.90    
Stock options forfeited (in dollars per share)             $ 10.32    
Stock options vested (in dollars per share)             $ 8.54    
Unvested at the end of the period (in dollars per share)             $ 13.01   $ 9.55
Other stock option disclosures                  
Unrecognized compensation cost             2,407,000    
Number of shares available for future stock option grants             200,376    
Number of unvested options modified (in shares)         14,400        
Expiration term         10 years        
Incremental compensation expense           $ 240,000   $ 240,000