Quarterly report pursuant to Section 13 or 15(d)

Cash, Cash Equivalents and Short-term Investments (Details)

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Cash, Cash Equivalents and Short-term Investments (Details) (USD $)
In Thousands, unless otherwise specified
Oct. 31, 2013
Jan. 31, 2013
Oct. 31, 2012
Jan. 31, 2012
Cash, Cash Equivalents and Short-term Investments        
Total cash and cash equivalents $ 442,380 $ 65,725 $ 57,725 $ 44,126
Total short-term investments 5,449 23,247    
Cash, cash equivalents and short-term investments 447,829 88,972    
Cash
       
Cash, Cash Equivalents and Short-term Investments        
Total cash and cash equivalents 414,912 22,703    
Money market funds
       
Cash, Cash Equivalents and Short-term Investments        
Total cash and cash equivalents 27,468 32,522    
Commercial paper
       
Cash, Cash Equivalents and Short-term Investments        
Total cash and cash equivalents   10,500    
Total short-term investments 4,749 13,592    
Corporate debt securities
       
Cash, Cash Equivalents and Short-term Investments        
Total short-term investments $ 700 $ 9,655