Marketable Securities (Schedule of Available-for-sale Securities) (Details) - USD ($) $ in Thousands	Dec. 26, 2020	Mar. 28, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 364,083	$ 307,990
Gross Unrealized Gains	5,708	1,584
Gross Unrealized Losses	(11)	(3,993)
Estimated Fair Value (Net Carrying Amount)	369,780	305,581
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	347,642	286,668
Gross Unrealized Gains	5,484	1,157
Gross Unrealized Losses	(11)	(3,993)
Estimated Fair Value (Net Carrying Amount)	353,115	283,832
Non-U.S. government securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,681	12,483
Gross Unrealized Gains	218	260
Gross Unrealized Losses	0	0
Estimated Fair Value (Net Carrying Amount)	12,899	12,743
Agency discount notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,760
Gross Unrealized Gains	6
Gross Unrealized Losses	0
Estimated Fair Value (Net Carrying Amount)	$ 3,766
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		8,839
Gross Unrealized Gains		167
Gross Unrealized Losses		0
Estimated Fair Value (Net Carrying Amount)		$ 9,006

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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