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Financial Instruments (Tables)
 9 Months Ended
Dec. 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:

December 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
$
152,160


$
—


$
—


$
152,160


 
$
108,311


$
—


$
—


$
108,311

Bank certificates of deposit
139,956


—


—


139,956


 
124,987


—


—


124,987

Commercial paper
199,974


—


—


199,974


 
503,550


—


—


503,550

Corporate bonds
711,636


2,951


(2,215
)

712,372


 
270,945


5,193


(135
)

276,003

Auction rate securities
21,500


—


(1,644
)

19,856


 
31,900


—


(3,200
)

28,700

Municipal bonds
29,924


346


(411
)

29,859


 
24,496


514


(70
)

24,940

U.S. government and








 







    agency securities
830,128


607


(389
)

830,346


 
696,836


431


(45
)

697,222

Foreign government and








 







    agency securities
309,929


—


(2
)

309,927


 
269,901


—


—


269,901

Mortgage-backed securities
1,231,104


10,073


(13,804
)

1,227,373


 
1,180,156


17,601


(5,077
)

1,192,680

Debt mutual fund
61,350


—


(5,869
)

55,481


 
61,350


1,577


—


62,927


$
3,687,661


$
13,977


$
(24,334
)

$
3,677,304


 
$
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 December 28, 2013 and March 30, 2013:


December 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
$
156,468


$
(2,105
)

$
4,460


$
(110
)

$
160,928


$
(2,215
)
Auction rate securities
—


—


19,856


(1,644
)

19,856


(1,644
)
Municipal bonds
8,260


(374
)

1,271


(37
)

9,531


(411
)
U.S. government and













    agency securities
197,086


(389
)

—


—


197,086


(389
)
Foreign government and

















    agency securities
14,995


(2
)

—


—


14,995


(2
)
Mortgage-backed securities
637,186


(12,187
)

64,762


(1,617
)

701,948


(13,804
)
Debt mutual fund
55,481


(5,869
)

—


—


55,481


(5,869
)

$
1,069,476


$
(20,926
)

$
90,349


$
(3,408
)

$
1,159,825


$
(24,334
)


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
 
December 28, 2013
(In thousands)
Amortized
Cost

Estimated
Fair Value
Due in one year or less
$
1,774,724


$
1,774,774

Due after one year through five years
437,826


439,176

Due after five years through ten years
250,055


250,953

Due after ten years
1,011,546


1,004,760


$
3,474,151


$
3,469,663
Information on sale of available-for-sale securities
Certain information related to available-for-sale securities is as follows:
 
Three Months Ended
 
Nine Months Ended
(In thousands)
December 28, 2013

December 29, 2012
 
December 28, 2013

December 29, 2012
Proceeds from sale of available-for-sale securities
$
97,519


$
61,293

 
$
296,679


$
262,456

Gross realized gains on sale of available-for-sale securities
$
401


$
811

 
$
1,768


$
2,639

Gross realized losses on sale of available-for-sale securities
(530
)

(63
)
 
(2,045
)

(150
)
Net realized gains (losses) on sale of available-for-sale securities
$
(129
)

$
748

 
$
(277
)

$
2,489

Amortization of premiums on available-for-sale securities
$
6,458


$
6,580

 
$
20,521


$
18,141