Annual report pursuant to Section 13 and 15(d)

Composition of Certain Financial Statement Captions (Details)

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Composition of Certain Financial Statement Captions (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
Jan. 31, 2010
Cash, Cash Equivalents and Short-term Investments        
Total cash and cash equivalents $ 65,725 $ 44,126 $ 43,048 $ 16,164
Total short-term investments 23,247 46,455    
Cash, cash equivalents and short-term investments 88,972 90,581    
Cash
        
Cash, Cash Equivalents and Short-term Investments        
Total cash and cash equivalents 22,703 6,604    
Money market funds
        
Cash, Cash Equivalents and Short-term Investments        
Total cash and cash equivalents 32,522 31,614    
Commercial paper
        
Cash, Cash Equivalents and Short-term Investments        
Total cash and cash equivalents 10,500 2,893    
Total short-term investments 13,592 27,587    
Corporate debt securities
        
Cash, Cash Equivalents and Short-term Investments        
Total cash and cash equivalents   3,015    
Total short-term investments 9,655 17,968    
U.S. agency notes
        
Cash, Cash Equivalents and Short-term Investments        
Total short-term investments   $ 900