Fair Value of Cash Equivalents and Marketable Securities (Tables)

12 Months Ended

Jan. 29, 2012

Notes to financial statements [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

			Fair value measurement at reporting date using
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs
	January 29, 2012		(Level 1)		(Level 2)
	(In thousands)
Debt securities of United States government agencies (1)	$	770,754	$	—	$	770,754
Corporate debt securities (2)	1,117,447		—		1,117,447
Mortgage backed securities issued by United States government-sponsored enterprises (3)	161,559		—		161,559
Money market funds (4)	290,732		290,732		—
Debt securities issued by United States Treasury (5)	535,774		—		535,774
Total assets	$	2,876,266	$	290,732	$	2,585,534

(1) Includes $23.0 million in Cash Equivalents and $747.8 million in Marketable Securities on the Consolidated Balance Sheet.

(2) Includes $64.9 million in Cash Equivalents and $1,052.5 million 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.

(5) Includes $36.0 million in Cash Equivalents and $499.8 million in Marketable Securities on the Consolidated Balance Sheet.