Marketable Securities (Schedule of Cost and Estimated Fair Value of Available-for-sale Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Dec. 26, 2020	Mar. 28, 2020
Amortized Cost
Within 1 year	$ 42,680	$ 22,012
After 1 year	321,403	285,978
Amortized Cost	364,083	307,990
Estimated Fair Value
Within 1 year	43,289	22,008
After 1 year	326,491	283,573
Estimated Fair Value	$ 369,780	$ 305,581

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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