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Financial Instruments (Tables)
 12 Months Ended
Mar. 29, 2014
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:

March 29, 2014

 
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
$
213,988


$
—


$
—


$
213,988


 
$
108,311


$
—


$
—


$
108,311

Financial institution
























securities
366,906


—


—


366,906


 
304,921


—


—


304,921

Non-financial institution
























securities
753,888


3,428


(1,244
)

756,072


 
594,561


5,193


(135
)

599,619

Auction rate securities
21,500


—


(1,340
)

20,160


 
31,900


—


(3,200
)

28,700

Municipal bonds
31,367


604


(205
)

31,766


 
24,496


514


(70
)

24,940

U.S. government and








 







agency securities
548,568


1,135


(184
)

549,519


 
696,836


431


(45
)

697,222

Foreign government and








 







agency securities
354,935


—


—


354,935


 
269,901


—


—


269,901

Mortgage-backed securities
1,234,237


11,380


(10,528
)

1,235,089


 
1,180,156


17,601


(5,077
)

1,192,680

Debt mutual funds
81,350


216


(4,652
)

76,914


 
61,350


1,577


—


62,927


$
3,606,739


$
16,763


$
(18,153
)

$
3,605,349


 
$
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 March 29, 2014 and March 30, 2013:


March 29, 2014

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
Non-financial institution securities
$
112,470


$
(1,167
)

$
4,488


$
(77
)

$
116,958


$
(1,244
)
Auction rate securities
—


—


20,160


(1,340
)

20,160


(1,340
)
Municipal bonds
5,917


(166
)

1,743


(39
)

7,660


(205
)
U.S. government and













    agency securities
118,125


(184
)

—


—


118,125


(184
)
Mortgage-backed securities
457,903


(7,225
)

132,376


(3,303
)

590,279


(10,528
)
Debt mutual fund
56,698


(4,652
)

—


—


56,698


(4,652
)

$
751,113


$
(13,394
)

$
158,767


$
(4,759
)

$
909,880


$
(18,153
)


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
Non-financial institution securities
$
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
 
March 29, 2014
(In thousands)
Amortized
Cost

Estimated
Fair Value
Due in one year or less
$
1,614,563


$
1,614,735

Due after one year through five years
437,854


440,661

Due after five years through ten years
231,266


232,909

Due after ten years
1,027,718


1,026,142


$
3,311,401


$
3,314,447
Information on sale of available-for-sale securities
Certain information related to available-for-sale securities is as follows:
(In thousands)
March 29, 2014

March 30, 2013

March 31, 2012
Gross realized gains on sale of available-for-sale securities
$
2,080


$
3,488

 
$
2,916

Gross realized losses on sale of available-for-sale securities
(2,412
)

(673
)
 
(401
)
Net realized gains (losses) on sale of available-for-sale securities
$
(332
)

$
2,815

 
$
2,515

Amortization of premiums on available-for-sale securities
$
27,293


$
25,123

 
$
13,302