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STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
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Jan. 31, 2015
Stockholders' Equity Note [Abstract] |
Schedule of restricted stock |
|  | Awards Outstanding |  |  | Weighted Average Grant Date Fair Value |
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 |
Granted |  |  | 261,085 |  |  | $ | 68.51 |
Vested |  |  | (333,531 | ) |  | $ | 28.16 |
Canceled |  |  | (2,025 | ) |  | $ | 54.88 |
Unvested as of January 31, 2015 |  |  | 1,045,706 |  |  | $ | 47.59 |
Schedule of information regarding stock options |
|  | 2015 |  |  | 2014 |  |  | 2013 |
|  | Shares |  |  | Weighted Average Exercise |  |  | Shares |  |  | Weighted Average Exercise |  |  | Shares |  |  | Weighted Average Exercise |
Stock options outstanding at beginning of year |  |  | 268,488 |  |  | $ | 22.21 |  |  |  | 382,054 |  |  | $ | 20.79 |  |  |  | 417,722 |  |  | $ | 16.59 |
Exercised |  |  | (33,900 | ) |  | $ | 21.51 |  |  |  | (109,766 | ) |  | $ | 17.36 |  |  |  | (120,518 | ) |  | $ | 11.82 |
Granted |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |  |  |  | 85,000 |  |  | $ | 28.72 |
Cancelled or forfeited |  |  | — |  |  | $ | — |  |  |  | (3,800 | ) |  | $ | 19.39 |  |  |  | (150 | ) |  | $ | 18.40 |
Stock options outstanding at end of year |  |  | 234,588 |  |  | $ | 22.32 |  |  |  | 268,488 |  |  | $ | 22.21 |  |  |  | 382,054 |  |  | $ | 20.79 |
Exercisable |  |  | 125,088 |  |  | $ | 17.26 |  |  |  | 159,238 |  |  | $ | 18.65 |  |  |  | 224,121 |  |  | $ | 16.89 |
Schedule of information about stock options outstanding |
Range of Exercise Prices |  | Number Outstanding as of January 31, 2015 |  |  | Weighted Average Remaining Contractual Life |  |  | Weighted Average Exercise Price |  |  | Number Exercisable as of January 31, 2015 |  |  | Weighted Average Exercise Price |
$8.00  –  $12.00 |  |  | 11,400 |  |  |  | 3.41 |  |  | $ | 10.18 |  |  |  | 11,400 |  |  | $ | 10.18 |
$12.01  –  $16.00 |  |  | 49,100 |  |  |  | 3.07 |  |  | $ | 13.55 |  |  |  | 49,100 |  |  | $ | 13.55 |
$16.01  –  $40.00 |  |  | 174,088 |  |  |  | 5.91 |  |  | $ | 25.58 |  |  |  | 64,588 |  |  | $ | 21.32 |
|  |  | 234,588 |  |  |  |  |  |  |  |  |  |  |  | 125,088 |  |  |
Schedule of weighted average assumptions used in black-scholes option pricing model |
|  | 2013
Expected stock price volatility |  | 58.2%  –  68.5%
Expected lives of options |  |
Directors and officers |  | 7 years
Employees |  | 6 years
Risk-free interest rate |  | 0.3%  –  0.6%
Expected dividend yield |  | 0%

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 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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