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Fair Value of Cash Equivalents and Marketable Securities (Tables)
9 Months Ended
Oct. 28, 2012
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
 
October 28, 2012
 
(Level 1)
 
(Level 2)
 
(In thousands)
Debt securities issued by United States government agencies (1)
$
847,596

 
$

 
$
847,596

Debt securities issued by United States Treasury (1)
695,466

 

 
695,466

Corporate debt securities (2)
1,191,658

 

 
1,191,658

Mortgage-backed securities issued by government-sponsored entities (1)
190,661

 

 
190,661

Money market funds (3)
85,030

 
85,030

 

Total cash equivalents and marketable securities
$
3,010,411

 
$
85,030

 
$
2,925,381

 
(1)
Included in Marketable Securities on the Condensed Consolidated Balance Sheet.

(2)  
Includes $16.0 million in Cash Equivalents and $1,175.7 million in Marketable Securities on the Condensed Consolidated Balance Sheet.

(3)
Included in Cash Equivalents on the Condensed Consolidated Balance Sheet.