Marketable Securities (Schedule of Cost and Estimated Fair Value of Available-for-sale Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Jun. 26, 2021	Mar. 27, 2021
Amortized Cost
Within 1 year	$ 59,717	$ 54,895
After 1 year	310,288	310,297
Amortized Cost	370,005	365,192
Estimated Fair Value
Within 1 year	60,503	55,698
After 1 year	311,643	312,758
Estimated Fair Value	$ 372,146	$ 368,456

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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