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Fair Value of Financial Assets and Liabilities
6 Months Ended
Jul. 27, 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.  There were no significant transfers between Levels 1 and 2 assets for the three and six months ended July 27, 2014.
    
Financial assets measured at fair value are summarized below:
 
 
 
Fair Value Measurement as of July 27, 2014 Using
 
 
 
Quoted Prices 
in Active Markets for Identical Assets
 
Significant Other Observable Inputs
 
July 27, 2014
 
(Level 1)
 
(Level 2)
 
(In thousands)
Corporate debt securities (1)
$
2,043,430

 
$

 
$
2,043,430

Debt securities issued by United States government agencies (2)
700,161

 

 
700,161

Debt securities issued by United States Treasury (3)
587,311

 

 
587,311

Asset-backed securities (3)
411,528

 

 
411,528

Mortgage-backed securities issued by government-sponsored enterprises (3)
261,422

 

 
261,422

Money market funds (4)
119,491

 
119,491

 

Total cash equivalents and marketable securities
$
4,123,343

 
$
119,491

 
$
4,003,852

 
(1)
Includes $96.2 million in cash equivalents and $1.95 billion in marketable securities on the Condensed Consolidated Balance Sheet.
(2)
Includes $36.7 million in cash equivalents and $663.5 million in marketable securities on the Condensed Consolidated Balance Sheet.
(3)  
Included in marketable securities on the Condensed Consolidated Balance Sheet.
(4)
Included in cash equivalents on the Condensed Consolidated Balance Sheet.     
Financial liabilities measured at fair value:

We issued $1.5 billion 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 $1.63 billion and $1.53 billion as of July 27, 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.