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Stock-based Compensation (Tables) | 12 Months Ended
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Mar. 31, 2013
Stock-based Compensation |
Schedule of amounts recognized in the financial statements related to stock-based compensation | Amounts recognized in the financial statements related to stock-based compensation are as follows (in thousands, except per share data):
|  | Year ended March 31, |
|  | 2013 |  | 2012 |  | 2011 |
Total cost of stock based compensation charged against income before income tax |  | $ | 1,112 |  | $ | 464 |  | $ | 383 |
Amount of income tax benefit recognized in earnings |  | 77 |  | 81 |  | 21 |
Amount charged against net income |  | $ | 1,035 |  | $ | 383 |  | $ | 362 |
Impact on net income per common share: |  |  |  |  |  |  |
Basic |  | $ | 0.31 |  | $ | 0.12 |  | $ | 0.11 |
Diluted |  | 0.29 |  | 0.11 |  | 0.11 |
Schedule of valuation assumptions used for share-based awards |
|  | Year ended March 31, |
|  | 2013 |  | 2012 |  | 2011 |
Volatility |  | 27.5-31.1% |  | 33.4-33.7% |  | 34-36% |
Risk-free interest rate |  | 0.6-1.0% |  | 0.9-2.2% |  | 1.1-3.9% |
Expected option life (years) |  | 5-10 |  | 5-10 |  | 5-10 |
Dividend yield |  | 1.4% |  | 1.8% |  | 1.8% |
Schedule of stock option activity | A summary of the option activity as of and for the years ended March 31, 2013, 2012 and 2011 is as follows:
|  | Number of Shares |  | Weighted- average Exercise Price |  | Weighted- average Remaining Contractual Term |  | Aggregate Intrinsic Value (000s) |
Outstanding at March 31, 2010 |  | 391,765 |  | $ | 17.37 |  | 4.2 |  |  |
Granted |  | 137,060 |  | 25.43 |  | 5.0 |  |  |
Forfeited |  | (22,315 | ) | 19.16 |  | — |  |  |
Expired |  | (150 | ) | 11.65 |  | — |  |  |
Exercised |  | (62,718 | ) | 15.02 |  | — |  |  |
Outstanding at March 31, 2011 |  | 443,642 |  | 20.10 |  | 4.0 |  | $ | 3,861 |
Granted |  | 103,780 |  | 29.87 |  | 5.4 |  |  |
Forfeited |  | (11,940 | ) | 26.06 |  | — |  |  |
Expired |  | (1,020 | ) | 14.50 |  | — |  |  |
Exercised |  | (100,677 | ) | 18.00 |  | — |  |  |
Outstanding at March 31, 2012 |  | 433,785 |  | 22.77 |  | 3.9 |  | 11,516 |
Granted |  | 116,080 |  | 49.97 |  | 5.9 |  |  |
Forfeited |  | (40,375 | ) | 32.87 |  | — |  |  |
Expired |  | (40 | ) | 18.98 |  | — |  |  |
Exercised |  | (93,325 | ) | 20.56 |  | — |  |  |
Outstanding at March 31, 2013 |  | 416,125 |  | 29.87 |  | 3.7 |  | 9,529 |
Exercisable at March 31, |  |  |  |  |  |  |  |  |
2013 |  | 158,320 |  | 21.00 |  | 3.0 |  | 5,031 |
2012 |  | 148,910 |  | 19.28 |  | 3.2 |  | 4,473 |
2011 |  | 152,217 |  | 17.36 |  | 3.2 |  | 1,742 |
Schedule of unvested stock option activity | A summary of the status of our unvested option shares as of and for the years ended March 31, 2013, 2012 and 2011 is as follows:
|  | Unvested Shares |  | Weighted-average Grant-date Fair Value |
Unvested at March 31, 2010 |  | 247,085 |  | $ | 5.51 |
Options granted |  | 137,060 |  | 7.53 |
Options forfeited |  | (13,540 | ) | 6.51 |
Options vested |  | (79,180 | ) | 5.34 |
Unvested at March 31, 2011 |  | 291,425 |  | 6.46 |
Options granted |  | 103,780 |  | 8.33 |
Options forfeited |  | (11,395 | ) | 7.31 |
Options vested |  | (98,935 | ) | 5.97 |
Unvested at March 31, 2012 |  | 284,875 |  | 7.28 |
Options granted |  | 116,065 |  | 12.43 |
Options forfeited |  | (38,720 | ) | 8.86 |
Options vested |  | (104,415 | ) | 6.69 |
Unvested at March 31, 2013 |  | 257,805 |  | 9.55 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for unvested share options (or share units) that were outstanding at the beginning and end of the year, and the number of unvested share options or share units that were granted, vested, forfeited, and expired during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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