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Financial Instruments (Tables)
 3 Months Ended
Jun. 28, 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:
 
June 28, 2014
 
 
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
$
174,031

 
$
—

 
$
—

 
$
174,031

 
 
$
213,988

 
$
—

 
$
—

 
$
213,988

Financial institution


 


 


 


 
 


 


 


 


securities
254,969

 
—

 
—

 
254,969

 
 
366,906

 
—

 
—

 
366,906

Non-financial institution


 


 


 


 
 


 


 


 


securities
621,880

 
4,470

 
(344
)
 
626,006

 
 
753,888

 
3,428

 
(1,244
)
 
756,072

Auction rate securities
21,500

 
—

 
(796
)
 
20,704

 
 
21,500

 
—

 
(1,340
)
 
20,160

Municipal bonds
38,164

 
820

 
(143
)
 
38,841

 
 
31,367

 
604

 
(205
)
 
31,766

U.S. government and

 

 

 

 
 

 

 

 

agency securities
593,637

 
1,145

 
(80
)
 
594,702

 
 
548,568

 
1,135

 
(184
)
 
549,519

Foreign government and

 

 

 

 
 

 

 

 

agency securities
410,896

 
—

 
(6
)
 
410,890

 
 
354,935

 
—

 
—

 
354,935

Mortgage-backed securities
1,225,050

 
14,355

 
(6,870
)
 
1,232,535

 
 
1,234,237

 
11,380

 
(10,528
)
 
1,235,089

Debt mutual funds
101,350

 
703

 
(2,625
)
 
99,428

 
 
81,350

 
216

 
(4,652
)
 
76,914

Bank loans
57,667

 
105

 
(65
)
 
57,707

 
 
—

 
—

 
—

 
—

 
$
3,499,144

 
$
21,598

 
$
(10,929
)
 
$
3,509,813

 
 
$
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 June 28, 2014 and March 29, 2014:

 
June 28, 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
$
32,613

 
$
(84
)
 
$
19,902

 
$
(260
)
 
$
52,515

 
$
(344
)
Auction rate securities
—

 
—

 
20,704

 
(796
)
 
20,704

 
(796
)
Municipal bonds
4,026

 
(6
)
 
4,603

 
(137
)
 
8,629

 
(143
)
U.S. government and

 

 

 

 


 


    agency securities
250,910

 
(31
)
 
4,369

 
(49
)
 
255,279

 
(80
)
Foreign government and

 

 

 

 


 


agency securities
124,968

 
(6
)
 
—

 
—

 
124,968

 
(6
)
Mortgage-backed securities
234,724

 
(2,223
)
 
274,363

 
(4,647
)
 
509,087

 
(6,870
)
Debt mutual fund
—

 
—

 
58,724

 
(2,625
)
 
58,724

 
(2,625
)
Bank loans
30,097

 
(65
)

—

 
—

 
30,097

 
(65
)
 
$
677,338

 
$
(2,415
)
 
$
382,665

 
$
(8,514
)
 
$
1,060,003

 
$
(10,929
)

 
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
 
June 28, 2014
(In thousands)
Amortized
Cost
 
Estimated
Fair Value
Due in one year or less
$
1,464

 
$
1,464

Due after one year through five years
474

 
478

Due after five years through ten years
287

 
289

Due after ten years
999

 
1,005


$
3,224

 
$
3,236
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 28, 2014
 
June 29, 2013
Proceeds from sale of available-for-sale securities
$
59,581

 
$
95,139

Gross realized gains on sale of available-for-sale securities
$
837

 
$
1,101

Gross realized losses on sale of available-for-sale securities
(167
)
 
(994
)
Net realized gains (losses) on sale of available-for-sale securities
$
670

 
$
107

Amortization of premiums on available-for-sale securities
$
6,233

 
$
7,159