Marketable Securities (Schedule of Available-for-sale Securities) (Details) - USD ($) $ in Thousands	Dec. 28, 2019	Mar. 30, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 260,403	$ 228,757
Gross Unrealized Gains	2,900	1,035
Gross Unrealized Losses	(43)	(641)
Estimated Fair Value (Net Carrying Amount)	263,260	229,151
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	240,061	215,098
Gross Unrealized Gains	2,802	1,027
Gross Unrealized Losses	(22)	(600)
Estimated Fair Value (Net Carrying Amount)	242,841	215,525
Non-U.S. government securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	14,094	13,209
Gross Unrealized Gains	98	8
Gross Unrealized Losses	(1)	(40)
Estimated Fair Value (Net Carrying Amount)	14,191	13,177
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,248
Gross Unrealized Gains	0
Gross Unrealized Losses	(20)
Estimated Fair Value (Net Carrying Amount)	$ 6,228
Agency discount notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		450
Gross Unrealized Gains		0
Gross Unrealized Losses		(1)
Estimated Fair Value (Net Carrying Amount)		$ 449

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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