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Stock-Based Compensation (Details) (USD $)
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3 Months Ended |
6 Months Ended |
12 Months Ended |
6 Months Ended |
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
Stock options
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Sep. 30, 2011
Stock options
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Mar. 31, 2012
Stock options
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Sep. 30, 2012
Stock options
Minimum
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Sep. 30, 2011
Stock options
Minimum
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Sep. 30, 2012
Stock options
Maximum
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Sep. 30, 2011
Stock options
Maximum
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| Amounts recognized in the condensed financial statements related to stock-based compensation |
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| Total cost of stock-based compensation charged against income before income taxes |
$ 289,000 |
$ 96,000 |
$ 438,000 |
$ 192,000 |
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| Amount of income tax benefit recognized in earnings |
101,000 |
35,000 |
151,000 |
70,000 |
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| Amount charged against net income |
188,000 |
61,000 |
287,000 |
122,000 |
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| Impact on net income per common share: |
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| Basic (in dollars per share) |
$ 0.06 |
$ 0.02 |
$ 0.09 |
$ 0.04 |
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| Diluted (in dollars per share) |
$ 0.05 |
$ 0.02 |
$ 0.08 |
$ 0.04 |
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| Assumptions used to estimate the fair value of options granted |
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| Volatility (as a percent) |
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31.10% |
33.40% |
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| Risk-free interest rate (as a percent) |
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0.60% |
2.20% |
1.00% |
3.60% |
| Expected option life |
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5 years |
5 years |
10 years |
10 years |
| Dividend yield (as a percent) |
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1.50% |
1.70% |
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| Number of Shares |
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| Outstanding at the beginning of the period (in shares) |
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433,785 |
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| Options granted (in shares) |
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103,880 |
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| Options forfeited (in shares) |
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(31,050) |
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| Options expired (in shares) |
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(40) |
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| Options exercised (in shares) |
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(47,495) |
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| Outstanding at the end of the period (in shares) |
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459,080 |
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433,785 |
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| Exercisable at the end of the period (in shares) |
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192,530 |
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| Weighted-average Exercise Price per Share |
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| Outstanding at the beginning of the period (in dollars per share) |
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$ 22.77 |
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| Options granted (in dollars per share) |
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$ 50.20 |
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| Options forfeited (in dollars per share) |
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$ 33.06 |
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| Options expired (in dollars per share) |
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$ 18.98 |
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| Options exercised (in dollars per share) |
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$ 21.56 |
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| Outstanding at the end of the period (in dollars per share) |
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$ 28.41 |
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$ 22.77 |
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| Exercisable at the end of the period (in dollars per share) |
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$ 20.70 |
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| Weighted- average Remaining Contractual Term |
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| Outstanding |
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3 years 10 months 24 days |
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| Options granted |
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5 years 10 months 24 days |
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| Exercisable at the end of the period |
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3 years 1 month 6 days |
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| Aggregate Intrinsic Value |
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| Outstanding at the end of the period |
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13,041,000 |
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| Exercisable at the end of the period |
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3,986,000 |
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| Weighted average grant date fair value of option granted and intrinsic value of option exercised |
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| Intrinsic value of options exercised |
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1,300,000 |
588,000 |
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| Number of Shares |
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| Unvested at the beginning of the period (in shares) |
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284,875 |
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| Options granted (in shares) |
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103,880 |
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| Options forfeited (in shares) |
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(31,050) |
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| Options vested (in shares) |
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(91,155) |
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| Unvested at the end of the period (in shares) |
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266,550 |
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284,875 |
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| Weighted-average Grant-Date Fair Value |
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| Unvested at the beginning of the period (in dollars per share) |
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$ 7.23 |
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| Options granted (in dollars per share) |
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$ 12.37 |
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| Options forfeited (in dollars per share) |
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$ 8.92 |
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| Options vested (in dollars per share) |
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$ 6.80 |
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| Unvested at the end of the period (in dollars per share) |
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$ 9.18 |
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$ 7.23 |
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| Unrecognized compensation cost |
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| Unrecognized compensation cost |
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$ 1,930,000 |
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| Weighted average period of recognition |
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3 years |
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