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Stock Option Plans (Tables) | 12 Months Ended
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Jan. 31, 2013
Stock Option Plans [Abstract] |
Schedule of fair value option award | Weighted average Black-Scholes-Merton fair value assumptions
|  | Years Ended January 31,
|  | 2013 |  | 2012 |  | 2011
Risk free interest rate |  | 0.58 - 0.78% |  | 1.52 -2.00% |  | 1.82 - 1.97%
Expected life |  | 3.28 - 6.60 yrs |  | 2.85 - 4.89 yrs |  | 2.4 - 4.4 yrs
Expected volatility |  | 59 - 60% |  | 54 - 55% |  | 57 - 58%
Expected dividend yield |  | 0.0% |  | 0.0% |  | 0.0%
Company's stock option activity |
|  | Number of Shares (in thousands) |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value (in thousands) |
Outstanding, January 31, 2012 |  |  | 1,413 |  |  | $ | 9.60 |  |  |  |  |  |  |  |  |
Granted |  |  | 172 |  |  |  | 18.21 |  |  |  |  |  |  |  |  |
Exercised |  |  | (158 | ) |  |  | 2.10 |  |  |  |  |  |  |  |  |
Forfeited |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Expired |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Outstanding, January 31, 2013 |  |  | 1,427 |  |  | $ | 11.37 |  |  |  | 5.23 |  |  | $ | 6,192 |
Exercisable at January 31, 2013 |  |  | 1,316 |  |  | $ | 10.94 |  |  |  | 4.88 |  |  | $ | 6,158 |
Vested and expected to vest at January 31, 2013 |  |  | 1,424 |  |  | $ | 11.44 |  |  |  | 5.20 |  |  | $ | 6,192 |
Restricted stock and changes during period |
|  | Year Ended January 31, 2013 |
|  | Number of Shares (in thousands) |  |  | Weighted Average Grant Date Fair Value |
Unvested, beginning of period |  |  | 36 |  |  |  | 10.47 |
Granted |  |  | 49 |  |  |  | 18.73 |
Vested |  |  | (49 | ) |  |  | 13.52 |
Canceled |  |  | — |  |  |  | — |
Unvested, end of period |  |  | 36 |  |  |  | 17.59 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited 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 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 employee stock purchase plans, including, but not limited to: (a) expected term, (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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