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Financial Instruments (Tables)
 6 Months Ended
Sep. 28, 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:

September 28, 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
$
168,053


$
—


$
—


$
168,053


 
$
108,311


$
—


$
—


$
108,311

Bank certificates of deposit
94,976


—


—


94,976


 
124,987


—


—


124,987

Commercial paper
582,348


—


—


582,348


 
503,550


—


—


503,550

Corporate bonds
299,100


2,823


(1,977
)

299,946


 
270,945


5,193


(135
)

276,003

Auction rate securities
25,150


—


(2,514
)

22,636


 
31,900


—


(3,200
)

28,700

Municipal bonds
28,592


371


(369
)

28,594


 
24,496


514


(70
)

24,940

U.S. government and








 







    agency securities
924,072


401


(217
)

924,256


 
696,836


431


(45
)

697,222

Foreign government and








 







    agency securities
319,960


—


—


319,960


 
269,901


—


—


269,901

Mortgage-backed securities
1,158,484


10,830


(12,640
)

1,156,674


 
1,180,156


17,601


(5,077
)

1,192,680

Debt mutual fund
61,350


—


(2,407
)

58,943


 
61,350


1,577


—


62,927


$
3,662,085


$
14,425


$
(20,124
)

$
3,656,386


 
$
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 September 28, 2013 and March 30, 2013:


September 28, 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
$
127,859


$
(1,977
)

$
—


$
—


$
127,859


$
(1,977
)
Auction rate securities
—


—


22,636


(2,514
)

22,636


(2,514
)
Municipal bonds
9,691


(341
)

862


(28
)

10,553


(369
)
U.S. government and













    agency securities
212,267


(217
)

—


—


212,267


(217
)
Mortgage-backed securities
610,583


(11,932
)

31,645


(708
)

642,228


(12,640
)
Debt mutual fund
58,943


(2,407
)

—


—


58,943


(2,407
)

$
1,019,343


$
(16,874
)

$
55,143


$
(3,250
)

$
1,074,486


$
(20,124
)


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
 
September 28, 2013
(In thousands)
Amortized
Cost

Estimated
Fair Value
Due in one year or less
$
1,858,718


$
1,858,944

Due after one year through five years
384,528


385,905

Due after five years through ten years
252,551


254,235

Due after ten years
936,885


930,306


$
3,432,682


$
3,429,390
Information on sale of available-for-sale securities
Certain information related to available-for-sale securities is as follows:
 
Three Months Ended
 
Six Months Ended
(In thousands)
September 28, 2013

September 29, 2012
 
September 28, 2013

September 29, 2012
Proceeds from sale of available-for-sale securities
$
104,021


$
119,058

 
$
199,160


$
201,163

Gross realized gains on sale of available-for-sale securities
$
266


$
1,042

 
$
1,367


$
1,829

Gross realized losses on sale of available-for-sale securities
(521
)

(12
)
 
(1,515
)

(88
)
Net realized gains (losses) on sale of available-for-sale securities
$
(255
)

$
1,030

 
$
(148
)

$
1,741

Amortization of premiums on available-for-sale securities
$
6,904


$
5,942

 
$
14,063


$
11,561