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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 |  |

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