Quarterly report pursuant to Section 13 or 15(d)

Composition of Certain Financial Statement Captions (Details 2)

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Composition of Certain Financial Statement Captions (Details 2) (USD $)
In Thousands, unless otherwise specified
Oct. 31, 2012
item
Jan. 31, 2012
Available-for-sale securities    
Adjusted Cost $ 66,252 $ 83,982
Unrealized Gains   1
Unrealized Losses (4) (6)
Fair Value 66,248 83,977
Number of owned securities that were in an unrealized loss position 20  
Money market funds
   
Available-for-sale securities    
Adjusted Cost 32,820 31,614
Fair Value 32,820 31,614
Commercial paper
   
Available-for-sale securities    
Adjusted Cost 22,244 30,481
Unrealized Losses   (1)
Fair Value 22,244 30,480
Corporate debt securities
   
Available-for-sale securities    
Adjusted Cost 11,188 20,987
Unrealized Gains   1
Unrealized Losses (4) (5)
Fair Value 11,184 20,983
U.S. agency notes
   
Available-for-sale securities    
Adjusted Cost   900
Fair Value   $ 900