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Stock-Based Compensation (Tables) | 3 Months Ended
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Apr. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Activity under Company's Stock Option Plans | Summaries of activity under the Company’s stock option plans for the three months ended April 30, 2015 and 2014 are presented below:
|  | Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Term (years) |  |  | Weighted Average Fair Value |
Outstanding, February 1, 2015 |  |  | 876,350 |  |  | $ | 22.34 |  |  |  | 7.08 |  |  | $ | 6.01 |
Granted |  |  | 100,000 |  |  | $ | 32.68 |  |  |  |  |  |  |  |  |
Exercised |  |  | (37,750 | ) |  | $ | 11.48 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (6,000 | ) |  | $ | 17.33 |  |  |  |  |  |  |  |  |
Outstanding, April 30, 2015 |  |  | 932,600 |  |  | $ | 23.92 |  |  |  | 7.32 |  |  | $ | 6.38 |
Exercisable, April 30, 2015 |  |  | 707,600 |  |  | $ | 21.01 |  |  |  | 6.82 |  |  | $ | 5.72 |
|  | Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Term (years) |  |  | Weighted Average Fair Value |
Outstanding, February 1, 2014 |  |  | 916,150 |  |  | $ | 17.36 |  |  |  | 6.04 |  |  | $ | 5.58 |
Granted |  |  | 180,500 |  |  | $ | 27.09 |  |  |  |  |  |  |  |  |
Exercised |  |  | (83,500 | ) |  | $ | 13.50 |  |  |  |  |  |  |  |  |
Forfeited |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Outstanding, April 30, 2014 |  |  | 1,013,150 |  |  | $ | 19.41 |  |  |  | 6.76 |  |  | $ | 5.65 |
Exercisable, April 30, 2014 |  |  | 600,650 |  |  | $ | 15.75 |  |  |  | 5.98 |  |  | $ | 5.81 |
Summary of Change in Number of Non-Vested Options to Purchase Shares of Common Stock | A summary of the change in the number of non-vested options to purchase shares of common stock for the three months ended April 30, 2015 and 2014 is presented below:
|  | Shares |  |  | Weighted Average Fair Value |
Nonvested, February 1, 2015 |  |  | 305,500 |  |  | $ | 7.14 |
Granted |  |  | 100,000 |  |  | $ | 8.55 |
Vested |  |  | (180,500 | ) |  | $ | 6.28 |
Nonvested, April 30, 2015 |  |  | 225,000 |  |  | $ | 8.45 |
|  | Shares |  |  | Weighted Average Fair Value |
Nonvested, February 1, 2014 |  |  | 303,000 |  |  | $ | 4.40 |
Granted |  |  | 180,500 |  |  | $ | 6.28 |
Vested |  |  | (71,000 | ) |  | $ | 3.27 |
Nonvested, April 30, 2014 |  |  | 412,500 |  |  | $ | 5.42 |
Summary of Assumptions Used to Estimate Fair Value of Stock Options Granted | The fair value of each stock option granted in the three-month periods ended April 30, 2015 and 2014 was estimated on the corresponding date of award using the Black-Scholes option-pricing model based on the following weighted average assumptions.
|  | Three Months Ended April 30, 2015 |  |  | Three Months Ended April 30, 2014 |
Dividend yield |  |  | 2.14 | % |  |  | 2.77 | %
Expected volatility |  |  | 34.63 | % |  |  | 33.83 | %
Risk-free interest rate |  |  | 1.40 | % |  |  | 1.26 | %
Expected life in years |  |  | 5.13 |  |  |  | 4.81 |

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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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