Marketable Securities (Schedule of Available-for-sale Securities) (Details) - USD ($) $ in Thousands	Sep. 26, 2020	Mar. 28, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 358,550	$ 307,990
Gross Unrealized Gains	6,409	1,584
Gross Unrealized Losses	(63)	(3,993)
Estimated Fair Value (Net Carrying Amount)	364,896	305,581
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	342,943	286,668
Gross Unrealized Gains	6,136	1,157
Gross Unrealized Losses	(63)	(3,993)
Estimated Fair Value (Net Carrying Amount)	349,016	283,832
Non-U.S. government securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	10,520	12,483
Gross Unrealized Gains	250	260
Gross Unrealized Losses	0	0
Estimated Fair Value (Net Carrying Amount)	10,770	12,743
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,263	8,839
Gross Unrealized Gains	18	167
Gross Unrealized Losses	0	0
Estimated Fair Value (Net Carrying Amount)	1,281	$ 9,006
Agency discount notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,824
Gross Unrealized Gains	5
Gross Unrealized Losses	0
Estimated Fair Value (Net Carrying Amount)	$ 3,829

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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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