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Financial Instruments (Tables)
 3 Months Ended
Jun. 29, 2013
Investments, All Other Investments [Abstract]  
Available-for-sale securities
The following is a summary of cash equivalents and available-for-sale securities as of the end of the periods presented:

June 29, 2013

 
March 30, 2013
(In thousands)
Amortized Cost

Gross Unrealized Gains

Gross Unrealized Losses

Estimated Fair Value

 
Amortized Cost

Gross Unrealized Gains

Gross Unrealized Losses

Estimated Fair Value
Money market funds
$
178,579


$
—


$
—


$
178,579


 
$
108,311


$
—


$
—


$
108,311

Bank certificates of deposit
154,985


—


—


154,985


 
124,987


—


—


124,987

Commercial paper
491,249


—


—


491,249


 
503,550


—


—


503,550

Corporate bonds
263,696


2,291


(3,156
)

262,831


 
270,945


5,193


(135
)

276,003

Auction rate securities
31,500


—


(2,254
)

29,246


 
31,900


—


(3,200
)

28,700

Municipal bonds
21,897


356


(284
)

21,969


 
24,496


514


(70
)

24,940

U.S. government and








 







    agency securities
872,223


254


(317
)

872,160


 
696,836


431


(45
)

697,222

Foreign government and








 







    agency securities
224,916


—


—


224,916


 
269,901


—


—


269,901

Mortgage-backed securities
1,141,612


9,367


(15,240
)

1,135,739


 
1,180,156


17,601


(5,077
)

1,192,680

Debt mutual fund
61,350


—


(1,733
)

59,617


 
61,350


1,577


—


62,927


$
3,442,007


$
12,268


$
(22,984
)

$
3,431,291


 
$
3,272,432


$
25,316


$
(8,527
)

$
3,289,221
Fair values and gross unrealized losses of the investments
The following tables show the fair values and gross unrealized losses of the Company’s investments, aggregated by investment category, for individual securities that have been in a continuous unrealized loss position for the length of time specified, as of June 29, 2013 and March 30, 2013:


June 29, 2013

Less Than 12 Months

12 Months or Greater

Total
(In thousands)
Fair Value

Gross Unrealized Losses

Fair Value

Gross Unrealized Losses

Fair Value

Gross Unrealized Losses
Corporate bonds
$
147,496


$
(3,156
)

$
—


$
—


$
147,496


$
(3,156
)
Auction rate securities
—


—


22,896


(2,254
)

22,896


(2,254
)
Municipal bonds
9,454


(254
)

876


(30
)

10,330


(284
)
U.S. government and













    agency securities
355,573


(317
)

—


—


355,573


(317
)
Mortgage-backed securities
702,968


(14,642
)

27,385


(598
)

730,353


(15,240
)
Debt mutual fund
59,617


(1,733
)

—


—


59,617


(1,733
)

$
1,275,108


$
(20,102
)

$
51,157


$
(2,882
)

$
1,326,265


$
(22,984
)


March 30, 2013

Less Than 12 Months

12 Months or Greater

Total
(In thousands)
Fair Value

Gross Unrealized Losses

Fair Value

Gross Unrealized Losses

Fair Value

Gross Unrealized Losses
Corporate bonds
$
27,114


$
(135
)

$
—


$
—


$
27,114


$
(135
)
Auction rate securities
—


—


28,701


(3,200
)

28,701


(3,200
)
Municipal bonds
8,927


(70
)

60


—


8,987


(70
)
U.S. government and













    agency securities
388,696


(45
)

—


—


388,696


(45
)
Mortgage-backed securities
367,561


(4,930
)

11,029


(147
)

378,590


(5,077
)

$
792,298


$
(5,180
)

$
39,790


$
(3,347
)

$
832,088


$
(8,527
)
Amortized cost and estimated fair value of marketable debt securities
 
June 29, 2013
(In thousands)
Amortized
Cost

Estimated
Fair Value
Due in one year or less
$
1,618,575


$
1,618,680

Due after one year through five years
410,737


410,270

Due after five years through ten years
246,066


247,012

Due after ten years
926,700


917,133


$
3,202,078


$
3,193,095
Information on sale of available-for-sale securities
Certain information related to available-for-sale securities is as follows:
 
Three Months Ended
(In thousands)
June 29, 2013

June 30, 2012
Proceeds from sale of available-for-sale securities
$
95,139


$
97,571

Gross realized gains on sale of available-for-sale securities
$
1,101


$
787

Gross realized losses on sale of available-for-sale securities
(994
)

(75
)
Net realized gains on sale of available-for-sale securities
$
107


$
712

Amortization of premiums on available-for-sale securities
$
7,159


$
5,619