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Fair Value of Financial Assets and Liabilities
12 Months Ended
Jan. 25, 2015
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 year ended January 25, 2015. Level 3 assets are based on unobservable inputs to the valuation methodology and include our own data about assumptions market participants would use in pricing the asset or liability based on the best information available under the circumstances. Most of our cash equivalents and marketable securities are valued based on Level 2 inputs. We did not have any investments classified as Level 3 as of January 25, 2015.
 
Financial assets measured at fair value are summarized below:
 
 
 
Fair Value Measurement at Reporting Date Using 
 
 
 
Quoted Prices in Active Markets for Identical Assets
 
Significant Other Observable Inputs
 
January 25, 2015
 
(Level 1)
 
(Level 2)
 
(In thousands)
Debt securities of United States government agencies (1)
$
750,320

 
$

 
$
750,320

Corporate debt securities (2)
2,186,311

 

 
2,186,311

Mortgage backed securities issued by United States government-sponsored enterprises (3)
278,105

 

 
278,105

Money market funds (4)
132,495

 
132,495

 

Debt securities issued by United States Treasury (3)
536,364

 

 
536,364

Asset-backed securities (3)
452,884

 

 
452,884

Foreign government bonds (3)
84,916

 

 
84,916

Total assets
$
4,421,395

 
$
132,495


$
4,288,900


(1)
Includes $15.0 million in Cash Equivalents and $735.3 million in Marketable Securities on the Consolidated Balance Sheet.
(2)
Includes $147.2 million in Cash Equivalents and $2.0 billion in Marketable Securities on the Consolidated Balance Sheet.
(3)
Included in Marketable Securities on the Consolidated Balance Sheet.
(4)
Included in Cash Equivalents on the Consolidated Balance Sheet.
 
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 $1,679.6 million and $1,528.4 million, respectively, as of January 25, 2015 and January 26, 2014. 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 the Consolidated Financial Statements for further information regarding the Notes.