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Stockholders' Equity (Details 2)
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12 Months Ended | ||||||
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Jan. 31, 2013
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Jan. 31, 2012
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Jan. 31, 2011
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| Weighted average volatility | 52.00% | 52.00% | 53.00% | ||||
| Weighted average interest rate | 1.20% | 0.80% | 1.60% | ||||
| Expected dividend yield | 0.00% | 0.00% | 0.00% | ||||
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Employee Stock [Member]
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| Expected term (in years) | 0 years | [1] | 0 years | [1] | 6 months | ||
| Weighted average volatility | 0.00% | [1] | 0.00% | [1] | 48.00% | ||
| Weighted average interest rate | 0.00% | [1] | 0.00% | [1] | 0.10% | ||
| Expected dividend yield | 0.00% | [1] | 0.00% | [1] | 0.00% | ||
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| X | ||||||||||
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- Definition
The range of expected interest rates used and the weighted-average expected interest rates for an entity using a valuation technique with different interests during the contractual term. No definition available.
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| X | ||||||||||
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- Definition
The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The range of expected volatilities used and the weighted-average expected volatility for an entity using a valuation technique with different volatilities during the contractual term. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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