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STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
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Jan. 31, 2017
Stockholders' Equity Note [Abstract] |
Schedule of restricted stock | Restricted Stock Units
|  |  | Awards Outstanding |  |  | Weighted Average Grant Date Fair Value |
Unvested as of January 31, 2015 |  |  |  |  | 2,091,412 |  |  |  |  | $ | 23.80 |  |
Granted |  |  |  |  | 507,319 |  |  |  |  | $ | 47.36 |  |
Vested |  |  |  |  | (549,848) |  |  |  |  | $ | 19.40 |  |
Canceled |  |  |  |  | — |  |  |  |  | $ | — |  |
Unvested as of January 31, 2016 |  |  |  |  | 2,048,883 |  |  |  |  | $ | 30.79 |  |
Granted |  |  |  |  | 630,642 |  |  |  |  | $ | 25.82 |  |
Vested |  |  |  |  | (678,164) |  |  |  |  | $ | 22.43 |  |
Canceled |  |  |  |  | (2,500) |  |  |  |  | $ | 17.95 |  |
Unvested as of January 31, 2017 |  |  |  |  | 1,998,861 |  |  |  |  | $ | 31.70 |  |
Schedule of information regarding stock options |
|  |  | 2017 |  |  | 2016 |  |  | 2015 |
|  |  | Shares |  |  | Weighted Average Exercise |  |  | Shares |  |  | Weighted Average Exercise |  |  | Shares |  |  | Weighted Average Exercise |
Stock options outstanding at beginning of year |  |  |  |  | 331,651 |  |  |  |  | $ | 10.59 |  |  |  |  |  | 469,176 |  |  |  |  | $ | 11.16 |  |  |  |  |  | 536,976 |  |  |  |  | $ | 11.11 |  |
Exercised |  |  |  |  | (20,520) |  |  |  |  | $ | 12.65 |  |  |  |  |  | (37,525) |  |  |  |  | $ | 11.11 |  |  |  |  |  | (67,800) |  |  |  |  | $ | 10.76 |  |
Granted |  |  |  |  | — |  |  |  |  | $ | — |  |  |  |  |  | — |  |  |  |  | $ | — |  |  |  |  |  | — |  |  |  |  | $ | — |  |
Cancelled or forfeited |  |  |  |  | (60,000) |  |  |  |  | $ | 15.87 |  |  |  |  |  | (100,000) |  |  |  |  | $ | 13.08 |  |  |  |  |  | — |  |  |  |  | $ | — |  |
Stock options outstanding at end of year |  |  |  |  | 251,131 |  |  |  |  | $ | 9.16 |  |  |  |  |  | 331,651 |  |  |  |  | $ | 10.59 |  |  |  |  |  | 469,176 |  |  |  |  | $ | 11.16 |  |
Exercisable |  |  |  |  | 251,131 |  |  |  |  | $ | 9.16 |  |  |  |  |  | 253,151 |  |  |  |  | $ | 9.07 |  |  |  |  |  | 250,176 |  |  |  |  | $ | 8.63 |  |
Schedule of information about stock options outstanding |
Range of Exercise Prices |  |  | Number Outstanding as of January 31, 2017 |  |  | Weighted Average Remaining Contractual Life |  |  | Weighted Average Exercise Price |  |  | Number Exercisable as of January 31, 2017 |  |  | Weighted Average Exercise Price |
$0.00 – $8.00 |  |  |  |  | 113,800 |  |  |  |  |  | 1.24 |  |  |  |  | $ | 6.61 |  |  |  |  |  | 113,800 |  |  |  |  | $ | 6.61 |  |
$8.01 – $12.00 |  |  |  |  | 84,265 |  |  |  |  |  | 0.60 |  |  |  |  | $ | 9.23 |  |  |  |  |  | 84,265 |  |  |  |  | $ | 9.23 |  |
$12.01 – $16.00 |  |  |  |  | 36,400 |  |  |  |  |  | 4.08 |  |  |  |  | $ | 12.98 |  |  |  |  |  | 36,400 |  |  |  |  | $ | 12.98 |  |
$16.01 – $40.00 |  |  |  |  | 16,666 |  |  |  |  |  | 5.19 |  |  |  |  | $ | 17.85 |  |  |  |  |  | 16,666 |  |  |  |  | $ | 17.85 |  |
|  |  |  |  | 251,131 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 251,131 |  |  |

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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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