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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 | Sep. 28, 2019 | Mar. 30, 2019
--- | --- | ---
Amortized Cost |  |
Within 1 year | $ 22,527 | $ 70,490
After 1 year | 235,883 | 158,267
Amortized Cost | 258,410 | 228,757
Estimated Fair Value |  |
Within 1 year | 22,563 | 70,183
After 1 year | 238,741 | 158,968
Estimated Fair Value | $ 261,304 | $ 229,151

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