Marketable Securities (Schedule of Cost and Estimated Fair Value of Available-for-sale Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Dec. 28, 2019	Mar. 30, 2019
Amortized Cost
Within 1 year	$ 13,048	$ 70,490
After 1 year	247,355	158,267
Amortized Cost	260,403	228,757
Estimated Fair Value
Within 1 year	13,098	70,183
After 1 year	250,162	158,968
Estimated Fair Value	$ 263,260	$ 229,151

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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