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Financial Instruments (Tables)
 9 Months Ended
Jan. 01, 2022
Investments, All Other Investments [Abstract]  
Summary of Cash Equivalents and 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:
January 1, 2022April 3, 2021
(In thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair ValueAmortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Money market funds$1,023,821 $— $— $1,023,821 $583,390 $— $— $583,390 
Financial institution
securities480,660 — — 480,660 434,982 — — 434,982 
Non-financial institution
securities576,412 1 (3)576,410 533,835 — — 533,835 
U.S. government and
agency securities765,297 111 (208)765,200 568,122 45 — 568,167 
Foreign government and
agency securities562,416 — (28)562,388 662,855 — — 662,855 
Mortgage-backed securities
48,849 25 (422)48,452 108,460 1,488 (345)109,603 
Asset-backed securities— — — — 159 13 — 172 
Commercial mortgage-
backed securities6,418 — (157)6,261 12,622 86 (6)12,702 
$3,463,873 $137 $(818)$3,463,192 $2,904,425 $1,632 $(351)$2,905,706 
Schedule of Fair Values and Gross Unrealized Losses
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 January 1, 2022 and April 3, 2021:

January 1, 2022
Less Than 12 Months12 Months or GreaterTotal
(In thousands)Fair ValueGross Unrealized LossesFair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
Non-financial institution securities$64,983 $(3)$— $— $64,983 $(3)
U.S. government and
    agency securities598,733 (208)— — 598,733 (208)
Foreign government and
    agency securities298,937 (28)— — 298,937 (28)
Mortgage-backed securities41,866 (422)— — 41,866 (422)
Commercial mortgage-
backed securities6,261 (157)— — 6,261 (157)
$1,010,780 $(818)$— $— $1,010,780 $(818)

April 3, 2021
Less Than 12 Months12 Months or GreaterTotal
(In thousands)Fair ValueGross Unrealized LossesFair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
Mortgage-backed securities$37,442 $(216)$9,835 $(129)$47,277 $(345)
Commercial mortgage-
    backed securities2,671 (5)181 (1)2,852 (6)
$40,113 $(221)$10,016 $(130)$50,129 $(351)
Summary of Contractual Maturity The amortized cost and estimated fair value of marketable debt securities, by contractual maturity, are shown in the table below. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations without call or prepayment penalties.
 January 1, 2022
(In thousands)Amortized
Cost		Estimated
Fair Value
Due in one year or less$2,304,644 $2,304,414 
Due after one year through five years80,967 81,057 
Due after five years through ten years4,138 4,061 
Due after ten years50,303 49,839 
$2,440,052 $2,439,371 
Schedule of Available-for-Sale Securities
Certain information related to available-for-sale securities is as follows:
Three Months EndedNine Months Ended
(In thousands)January 1, 2022January 2, 2021January 1, 2022January 2, 2021
Proceeds from sale of available-for-sale securities$143,353 $3,896 $149,208 $60,351 
Gross realized gains on sale of available-for-sale securities$712 $— $748 $413 
Gross realized losses on sale of available-for-sale securities(1,169)(75)(1,233)(299)
Net realized gains (losses) on sale of available-for-sale securities$(457)$(75)$(485)$114 
Amortization of premiums (discounts) on available-for-sale securities$(19)$(141)$873 $(257)