Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
Stock-based compensation expense by type of award:      
Stock options $ 1,758 $ 120 $ (60)
Restricted stock units 2,218 1,265 742
Performance-based restricted stock units 125 1,603 1,763
Employee stock purchase plan 0 0 153
Total stock-based compensation $ 4,101 $ 2,988 $ 2,598