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STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
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Jan. 31, 2014
Equity [Abstract] |
Schedule of restricted stock |
|  | Awards Outstanding |  |  | Weighted Average Grant Date Fair Value |
Unvested as of January 31, 2012 |  |  | 925,900 |  |  | $ | 22.60 |
Granted |  |  | 358,985 |  |  | $ | 35.18 |
Vested |  |  | (226,341 | ) |  | $ | 12.54 |
Canceled |  |  | (1,813 | ) |  | $ | 29.28 |
Unvested as of January 31, 2013 |  |  | 1,056,731 |  |  | $ | 29.01 |
Granted |  |  | 315,750 |  |  | $ | 51.96 |
Vested |  |  | (236,316 | ) |  | $ | 22.04 |
Canceled |  |  | (15,988 | ) |  | $ | 29.01 |
Unvested as of January 31, 2014 |  |  | 1,120,177 |  |  | $ | 36.95 |
Schedule of information regarding stock options |
|  | 2014 |  |  | 2013 |  |  | 2012 |
|  |  |  |  | Weighted |  |  |  |  |  | Weighted |  |  |  |  |  | Weighted |
|  |  |  |  | Average |  |  |  |  |  | Average |  |  |  |  |  | Average |
|  |  |  |  | Exercise |  |  |  |  |  | Exercise |  |  |  |  |  | Exercise |
|  | Shares |  |  | Price |  |  | Shares |  |  | Price |  |  | Shares |  |  | Price |
Stock options outstanding at beginning of year |  |  | 382,054 |  |  | $ | 20.79 |  |  |  | 417,722 |  |  | $ | 16.59 |  |  |  | 514,190 |  |  | $ | 14.54 |
Exercised |  |  | (109,766 | ) |  | $ | 17.36 |  |  |  | (120,518 | ) |  | $ | 11.82 |  |  |  | (60,668 | ) |  | $ | 10.21 |
Granted |  |  | - |  |  | $ | - |  |  |  | 85,000 |  |  | $ | 28.72 |  |  |  | 40,000 |  |  | $ | 27.13 |
Cancelled or forfeited |  |  | (3,800 | ) |  | $ | 19.39 |  |  |  | (150 | ) |  | $ | 18.40 |  |  |  | (75,800 | ) |  | $ | 13.35 |
Stock options outstanding at end of year |  |  | 268,488 |  |  | $ | 22.21 |  |  |  | 382,054 |  |  | $ | 20.79 |  |  |  | 417,722 |  |  | $ | 16.59 |
Exercisable |  |  | 159,238 |  |  | $ | 18.65 |  |  |  | 224,121 |  |  | $ | 16.89 |  |  |  | 245,556 |  |  | $ | 14.18 |
Schedule of information about stock options outstanding |
|  | Number Outstanding as of |  |  | Weighted Average |  |  | Weighted Average |  |  | Number Exercisable as of |  |  | Weighted Average |
|  | January 31, |  |  | Remaining |  |  | Exercise |  |  | January 31, |  |  | Exercise |
Range of Exercise Prices |  | 2014 |  |  | Contractual Life |  |  | Price |  |  | 2014 |  |  | Price |
$ 3.00 - $ 8.00 |  |  | 3,000 |  |  |  | 1.36 |  |  | $ | 5.03 |  |  |  | 3,000 |  |  | $ | 5.03 |
$ 8.01 - $ 12.00 |  |  | 12,000 |  |  |  | 4.46 |  |  | $ | 10.23 |  |  |  | 9,000 |  |  | $ | 9.94 |
$ 12.01 - $ 16.00 |  |  | 56,100 |  |  |  | 3.92 |  |  | $ | 13.63 |  |  |  | 56,100 |  |  | $ | 13.63 |
$ 16.01 - $ 40.00 |  |  | 197,388 |  |  |  | 6.41 |  |  | $ | 25.64 |  |  |  | 91,138 |  |  | $ | 23.06 |
|  |  | 268,488 |  |  |  |  |  |  |  |  |  |  |  | 159,238 |  |  |  |  |
Schedule of weighted average assumptions used in black-scholes option pricing model |
|  | 2013 |  |  | 2012 |
Expected stock price volatility |  |  | 58.2% - 68.5% |  |  |  | 68.5% |
Expected lives of options |  |  |  |  |  |  |  |
Directors and officers |  |  | 7 years |  |  |  | 7 years |
Employees |  |  | 6 years |  |  |  | 6 years |
Risk-free interest rate |  |  | 0.3% - 0.6% |  |  |  | 1.2% |
Expected dividend yield |  |  | 0% |  |  |  | 0% |

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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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