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Fair Value of Financial Assets and Liabilities
9 Months Ended
Oct. 26, 2014
Notes to financial statements [Abstract]  
Fair Value of Financial Assets and Liabilities
Fair Value of Financial Assets and Liabilities

Financial assets measured at fair value

We measure our cash equivalents and marketable securities at fair value. The fair values of our financial assets and liabilities are determined using quoted market prices of identical assets or quoted market prices of similar assets from active markets.  Our Level 1 assets consist of our money market funds. We classify securities within Level 1 assets when the fair value is obtained from real time quotes for transactions in active exchange markets involving identical assets.  Our available-for-sale securities are classified as having Level 2 inputs.  Our Level 2 assets are valued utilizing a market approach where the market prices of similar assets are provided by a variety of independent industry standard data providers to our investment custodian.  We review the fair value hierarchy classification on a quarterly basis. Changes in the observability of valuation inputs may result in a reclassification of levels for certain securities within the fair value hierarchy. There were no significant transfers between Levels 1 and 2 assets for the three and nine months ended October 26, 2014.
    
Financial assets measured at fair value are summarized below:
 
 
 
Fair Value Measurement as of October 26, 2014 Using
 
 
 
Quoted Prices 
in Active Markets for Identical Assets
 
Significant Other Observable Inputs
 
October 26, 2014
 
(Level 1)
 
(Level 2)
 
(In thousands)
Corporate debt securities (1)
$
1,957,060

 
$

 
$
1,957,060

Debt securities of United States government agencies (2)
586,125

 

 
586,125

Debt securities issued by United States Treasury (2)
578,013

 

 
578,013

Asset-backed securities (2)
437,751

 

 
437,751

Mortgage-backed securities issued by government-sponsored enterprises (2)
277,684

 

 
277,684

Foreign government bonds (2)
85,378

 

 
85,378

Money market funds (3)
72,881

 
72,881

 

Total cash equivalents and marketable securities
$
3,994,892

 
$
72,881

 
$
3,922,011

 
(1)
Includes $75.9 million in cash equivalents and $1.88 billion in marketable securities on the Condensed Consolidated Balance Sheets.
(2)  
Included in marketable securities on the Condensed Consolidated Balance Sheets.
(3)
Included in cash equivalents on the Condensed Consolidated Balance Sheets.     
Financial liabilities measured at fair value

We issued $1.50 billion Convertible Senior Notes, or Notes, in December 2013. The Notes are carried at their original issuance value, net of unamortized debt discount, and are not marked to market each period. The estimated fair value of the Notes was $1.70 billion and $1.53 billion as of October 26, 2014 and January 26, 2014, respectively. The estimated fair value of the Notes was determined on the basis of market prices observable for similar instruments and is considered Level 2 in the fair value hierarchy. Please refer to Note 11 of these Notes to Condensed Consolidated Financial Statements for discussion regarding the Notes.