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Convertible Senior Notes (Tables)
12 Months Ended
Jan. 31, 2015
Debt Disclosure [Abstract]  
Components of Notes

The Notes consist of the following components as of January 31, 2015 (in thousands):

 

Liability component

  

Principal

   $ 350,000   

Less: Debt discount

     (62,513
  

 

 

 

Net carrying amount

   $ 287,487   
  

 

 

 

Equity component (1)

   $ 70,482   
  

 

 

 

 

(1) Included in additional paid-in capital on the consolidated balance sheets.