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Stockholders' Equity (Details 2)
12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
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%
Employee Stock [Member]
     
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%
[1] The ESPP plan was cancelled in fiscal 2011.