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Fair Value of Cash Equivalents and Marketable Securities (Tables)
6 Months Ended
Jul. 28, 2013
Notes to financial statements [Abstract]  
Financial assets measured at Fair Value
 
Fair Value Measurement at Reporting Date Using
 
 
 
Quoted Prices 
in Active Markets for Identical Assets
 
Significant Other Observable Inputs
 
July 28, 2013
 
(Level 1)
 
(Level 2)
 
(In thousands)
Debt securities issued by United States government agencies (1)
$
691,464

 
$

 
$
691,464

Debt securities issued by United States Treasury (2)
497,146

 

 
497,146

Corporate debt securities (3)
965,945

 

 
965,945

Mortgage-backed securities issued by government-sponsored entities (2)
196,017

 

 
196,017

Money market funds (4)
164,885

 
164,885

 

Total cash equivalents and marketable securities
$
2,515,457

 
$
164,885

 
$
2,350,572

 
(1)
Includes $2.0 million in Cash Equivalents and $689.5 million in Marketable Securities on the Condensed Consolidated Balance Sheet.
(2)
Included in Marketable Securities on the Condensed Consolidated Balance Sheet.
(3)  
Includes $4.0 million in Cash Equivalents and $961.9 million in Marketable Securities on the Condensed Consolidated Balance Sheet.
(4)
Included in Cash Equivalents on the Condensed Consolidated Balance Sheet.