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Financial Instruments (Tables)
 6 Months Ended
Sep. 29, 2018
Investments, All Other Investments [Abstract]  
Available-for-sale securities
The following is a summary of cash equivalents, available-for-sale securities and equity-type securities as of the end of the periods presented:

 
September 29, 2018
 
 
March 31, 2018
(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
$
376,673

 
$
—

 
$
—

 
$
376,673

 
 
$
1,291,891

 
$
—

 
$
—

 
$
1,291,891

Financial institution


 


 


 


 
 


 


 


 


securities
628,965

 
15

 
—

 
628,980

 
 
434,901

 
—

 
—

 
434,901

Non-financial institution


 


 


 


 
 


 


 


 


securities
574,630

 
—

 
(1,294
)
 
573,336

 
 
326,219

 
—

 
(1,376
)
 
324,843

U.S. government and

 

 

 

 
 

 

 

 

agency securities
293,600

 
22

 
(337
)
 
293,285

 
 
58,913

 
1

 
(272
)
 
58,642

Foreign government and

 

 

 

 
 

 

 

 

agency securities
370,788

 
3

 
—

 
370,791

 
 
179,957

 
—

 
—

 
179,957

Mortgage-backed securities
775,806

 
476

 
(26,856
)
 
749,426

 
 
866,048

 
660

 
(22,311
)
 
844,397

Asset-backed securities
86,664

 
9

 
(1,252
)
 
85,421

 
 
92,751

 
16

 
(1,378
)
 
91,389

Debt mutual funds
101,350

 
—

 
(16,424
)
 
84,926

 
 
101,350

 
—

 
(11,680
)
 
89,670

Commercial mortgage-


 


 


 


 
 


 


 


 


backed securities
137,767

 
1

 
(3,579
)
 
134,189

 
 
156,296

 
1

 
(3,427
)
 
152,870

Marketable equity securities
7,500

 
—

 
(799
)
 
6,701

 
 
7,500

 
726

 
—

 
8,226

 
$
3,353,743

 
$
526

 
$
(50,541
)
 
$
3,303,728

 
 
$
3,515,826

 
$
1,404

 
$
(40,444
)
 
$
3,476,786
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 29, 2018 and March 31, 2018:

 
September 29, 2018
 
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
$
44,067

 
$
(748
)
 
$
19,640

 
$
(546
)
 
$
63,707

 
$
(1,294
)
U.S. government and

 

 

 

 


 


    agency securities
—

 
—

 
15,507

 
(337
)
 
15,507

 
(337
)
Mortgage-backed securities
222,604

 
(5,996
)
 
497,433

 
(20,860
)
 
720,037

 
(26,856
)
Asset-backed securities
18,472

 
(278
)
 
65,425

 
(974
)
 
83,897

 
(1,252
)
Debt mutual funds
—

 
—

 
84,926

 
(16,424
)
 
84,926

 
(16,424
)
Commercial mortgage-

 

 

 

 
 
 
 
backed securities
44,231

 
(950
)
 
88,823

 
(2,629
)
 
133,054

 
(3,579
)
Marketable equity securities
6,701

 
(799
)
 
—

 
—

 
6,701

 
(799
)
 
$
336,075

 
$
(8,771
)
 
$
771,754

 
$
(41,770
)
 
$
1,107,829

 
$
(50,541
)

 
March 31, 2018
 
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
$
69,780

 
$
(1,146
)
 
$
8,344

 
$
(230
)
 
$
78,124

 
$
(1,376
)
U.S. government and

 

 

 

 

 

    agency securities
13,471

 
(176
)
 
9,176

 
(96
)
 
22,647

 
(272
)
Mortgage-backed securities
510,988

 
(11,048
)
 
299,663

 
(11,263
)
 
810,651

 
(22,311
)
Asset-backed securities
57,128

 
(876
)
 
32,696

 
(502
)
 
89,824


(1,378
)
Debt mutual funds
—

 
—

 
89,670

 
(11,680
)
 
89,670

 
(11,680
)
Commercial mortgage-
 
 
 
 
 
 
 
 
 
 
 
    backed securities
95,435

 
(1,760
)
 
56,051

 
(1,667
)
 
151,486

 
(3,427
)
 
$
746,802

 
$
(15,006
)
 
$
495,600

 
$
(25,438
)
 
$
1,242,402

 
$
(40,444
)
Amortized cost and estimated fair value of marketable debt securities
 
September 29, 2018
(In thousands)
Amortized
Cost
 
Estimated
Fair Value
Due in one year or less
$
1,825,385

 
$
1,825,113

Due after one year through five years
162,134

 
158,928

Due after five years through ten years
139,922

 
135,283

Due after ten years
740,779

 
716,104


$
2,868,220

 
$
2,835,428
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 29, 2018
 
September 30, 2017
 
September 29, 2018
 
September 30, 2017
Proceeds from sale of available-for-sale securities
$
7

 
$
149,497

 
$
903

 
$
269,419

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

 
$
519

 
$
96

 
$
1,351

Gross realized losses on sale of available-for-sale securities
(1
)
 
(209
)
 
(48
)
 
(595
)
Net realized gains (losses) on sale of available-for-sale securities
$
(1
)
 
$
310

 
$
48

 
$
756

Amortization of premiums on available-for-sale securities
$
2,645

 
$
4,691

 
$
5,136

 
$
10,213