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Financial Instruments (Tables)
 12 Months Ended
Mar. 28, 2015
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 28, 2015

 
March 29, 2014
(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
$
235,583


$
—


$
—


$
235,583


 
$
213,988


$
—


$
—


$
213,988

Financial institution
























securities
304,999


—


—


304,999


 
366,906


—


—


366,906

Non-financial institution
























securities
429,005


25


(6
)

429,024


 
753,888


3,428


(1,244
)

756,072

Auction rate securities
10,500


—


(188
)

10,312


 
21,500


—


(1,340
)

20,160

Municipal bonds
49,064


744


(152
)

49,656


 
31,367


604


(205
)

31,766

U.S. government and








 







agency securities
757,954


91


(129
)

757,916


 
548,568


1,135


(184
)

549,519

Foreign government and








 







agency securities
197,932


—


—


197,932


 
354,935


—


—


354,935

Mortgage-backed securities
1,075,730


8,942


(4,496
)

1,080,176


 
1,234,237


11,380


(10,528
)

1,235,089

Asset-backed securities
211,487


1,130


(159
)

212,458

 
 
—


—


—


—

Debt mutual funds
101,350


—


(6,150
)

95,200


 
81,350


216


(4,652
)

76,914

Bank loans
98,131


29


(60
)

98,100

 
 
—


—


—


—


$
3,471,735


$
10,961


$
(11,340
)

$
3,471,356


 
$
3,606,739


$
16,763


$
(18,153
)

$
3,605,349
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 28, 2015 and March 29, 2014:


March 28, 2015

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
$
7,190


$
(6
)

$
—


$
—


$
7,190


$
(6
)
Auction rate securities
—


—


10,312


(188
)

10,312


(188
)
Municipal bonds
10,014


(94
)

1,931


(58
)

11,945


(152
)
U.S. government and













    agency securities
451,296


(129
)

—


—


451,296


(129
)
Mortgage-backed securities
448,770


(3,169
)

49,207


(1,327
)

497,977


(4,496
)
Asset-backed securities
75,009

 
(159
)
 
—

 
—

 
75,009

 
(159
)
Debt mutual funds
38,608


(1,392
)

56,592


(4,758
)

95,200


(6,150
)
Bank loans
65,085

 
(60
)
 
—

 
—

 
65,085

 
(60
)

$
1,095,972


$
(5,009
)

$
118,042


$
(6,331
)

$
1,214,014


$
(11,340
)


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
)
Amortized cost and estimated fair value of marketable debt securities
 
March 28, 2015
(In thousands)
Amortized
Cost

Estimated
Fair Value
Due in one year or less
$
1,583,478


$
1,583,407

Due after one year through five years
334,112


334,318

Due after five years through ten years
293,754


294,645

Due after ten years
923,459


928,202


$
3,134,803


$
3,140,572
Information on sale of available-for-sale securities
Certain information related to available-for-sale securities is as follows:
(In thousands)
March 28, 2015

March 29, 2014

March 30, 2013
Gross realized gains on sale of available-for-sale securities
$
15,101


$
2,080

 
$
3,488

Gross realized losses on sale of available-for-sale securities
(3,223
)

(2,412
)
 
(673
)
Net realized gains (losses) on sale of available-for-sale securities
$
11,878


$
(332
)
 
$
2,815

Amortization of premiums on available-for-sale securities
$
23,579


$
27,293

 
$
25,123