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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 |

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