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Marketable Securities (Schedule of Cost and Estimated Fair Value of Available-for-sale Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Jun. 27, 2020
Mar. 28, 2020
Amortized Cost    
Within 1 year $ 29,447 $ 22,012
After 1 year 283,603 285,978
Amortized Cost 313,050 307,990
Estimated Fair Value    
Within 1 year 29,943 22,008
After 1 year 290,186 283,573
Estimated Fair Value $ 320,129 $ 305,581