Marketable Securities (Tables)

3 Months Ended

Apr. 28, 2013

Notes to financial statements [Abstract]

Cash Equivalents and Marketable Securities

	April 28, 2013
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
	(In thousands)
Debt securities of United States government agencies	$	1,007,499	$	1,609	$	(34	)	$	1,009,074
Corporate debt securities	1,235,850		3,492		(618		)	1,238,724
Mortgage backed securities issued by United States government-sponsored enterprises	184,927		5,845		(235		)	190,537
Money market funds	39,350		—		—			39,350
Debt securities issued by United States Treasury	723,879		1,332		(18		)	725,193
Total	$	3,191,505	$	12,278	$	(905	)	$	3,202,878
Classified as:
Cash equivalents								$	50,950
Marketable securities								3,151,928
Total								$	3,202,878

	January 27, 2013
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
	(In thousands)
Debt securities of United States government agencies	$	867,087	$	1,199	$	(139	)	$	868,147
Corporate debt securities	1,255,297		3,175		(542		)	1,257,930
Mortgage backed securities issued by United States government-sponsored enterprises	183,034		6,194		(57		)	189,171
Money market funds	195,790		—		—			195,790
Debt securities issued by United States Treasury	785,228		1,102		(105		)	786,225
Total	$	3,286,436	$	11,670	$	(843	)	$	3,297,263
Classified as:
Cash equivalents								$	302,166
Marketable securities								2,995,097
Total								$	3,297,263

Schedule of Cash Equivalents and Marketable Securities Available for Sale

	April 28, 2013				January 27, 2013
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
	(In thousands)
Less than one year	$	1,337,236	$	1,339,144	$	1,397,350	$	1,399,304
Due in 1 - 5 years	1,751,183		1,757,767		1,777,785		1,783,103
Mortgage-backed securities issued by government-sponsored enterprises not due at a single maturity date	103,086		105,967		111,301		114,856
Total	$	3,191,505	$	3,202,878	$	3,286,436	$	3,297,263