Annual report pursuant to Section 13 and 15(d)

Composition of Certain Financial Statement Captions (Details 2)

v2.4.0.6
Composition of Certain Financial Statement Captions (Details 2) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2013
item
Jan. 31, 2012
Available-for-sale securities    
Adjusted Cost $ 66,272 $ 83,982
Unrealized Gains   1
Unrealized Losses (3) (6)
Fair Value 66,269 83,977
Number of owned securities that were in an unrealized loss position 22  
Money market funds
   
Available-for-sale securities    
Adjusted Cost 32,522 31,614
Fair Value 32,522 31,614
Commercial paper
   
Available-for-sale securities    
Adjusted Cost 24,093 30,481
Unrealized Losses (1) (1)
Fair Value 24,092 30,480
Corporate debt securities
   
Available-for-sale securities    
Adjusted Cost 9,657 20,987
Unrealized Gains   1
Unrealized Losses (2) (5)
Fair Value 9,655 20,983
U.S. agency notes
   
Available-for-sale securities    
Adjusted Cost   900
Fair Value   $ 900