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Financial Instruments (Tables)
 12 Months Ended
Mar. 30, 2019
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 30, 2019
 
 
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
$
428,150

 
$
—

 
$
—

 
$
428,150

 
 
$
1,291,891

 
$
—

 
$
—

 
$
1,291,891

Financial institution


 


 


 


 
 


 


 


 


securities
537,795

 
—

 
—

 
537,795

 
 
434,901

 
—

 
—

 
434,901

Non-financial institution


 


 


 


 
 


 


 


 


securities
702,483

 
3

 
(562
)
 
701,924

 
 
326,219

 
—

 
(1,376
)
 
324,843

U.S. government and
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
agency securities
334,185

 
39

 
(139
)
 
334,085

 
 
58,913

 
1

 
(272
)
 
58,642

Foreign government and


 

 

 

 
 


 

 

 

agency securities
214,455

 
—

 
—

 
214,455

 
 
179,957

 
—

 
—

 
179,957

Mortgage-backed securities
684,596

 
809

 
(14,635
)
 
670,770

 
 
866,048

 
660

 
(22,311
)
 
844,397

Asset-backed securities
76,852

 
—

 
(483
)
 
76,369

 
 
92,751

 
16

 
(1,378
)
 
91,389

Commercial mortgage-


 


 


 


 
 


 


 


 


    backed securities
118,115

 
42

 
(1,618
)
 
116,539

 
 
156,296

 
1

 
(3,427
)
 
152,870


$
3,096,631

 
$
893

 
$
(17,437
)
 
$
3,080,087

 
 
$
3,406,976

 
$
678

 
$
(28,764
)
 
$
3,378,890
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 30, 2019 and March 31, 2018:


March 30, 2019

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
$
4,767


$
(4
)

$
51,044


$
(558
)

$
55,811


$
(562
)
U.S. government and













    agency securities
—


—


13,542


(139
)

13,542


(139
)
Mortgage-backed securities
34,595


(480
)

597,394


(14,155
)

631,989


(14,635
)
Asset-backed securities
—

 
—

 
76,103

 
(483
)
 
76,103

 
(483
)
Commercial mortgage-
 
 
 
 
 
 
 
 
 
 
 
    backed securities
1,354

 
(3
)
 
112,294

 
(1,615
)
 
113,648

 
(1,618
)

$
40,716


$
(487
)

$
850,377


$
(16,950
)

$
891,093


$
(17,437
)


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
 
March 30, 2019
(In thousands)
Amortized
Cost

Estimated
Fair Value
Due in one year or less
$
1,756,125


$
1,756,001

Due after one year through five years
133,780


132,476

Due after five years through ten years
135,971


134,020

Due after ten years
642,605


629,440


$
2,668,481


$
2,651,937
Information on sale of available-for-sale securities
Certain information related to available-for-sale securities is as follows:
 
Years Ended
(In thousands)
March 30, 2019

March 31, 2018

April 1, 2017
Proceeds from sale of available-for-sale and equity securities
$
35,734


$
1,161,410


$
695,030

Gross realized gains on sale of available-for-sale securities
$
372


$
7,258

 
$
6,989

Gross realized losses on sale of available-for-sale securities
(51
)

(7,947
)
 
(3,457
)
Net realized (losses) gains on sale of available-for-sale securities
$
321


$
(689
)
 
$
3,532

Amortization of premiums on available-for-sale securities
$
8,118


$
24,569

 
$
29,360