Marketable Securities (Schedule of Available-for-sale Securities) (Details) - USD ($) $ in Thousands	Jun. 29, 2019	Mar. 30, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 254,920	$ 228,757
Gross Unrealized Gains	2,618	1,035
Gross Unrealized Losses	(109)	(641)
Estimated Fair Value (Net Carrying Amount)	257,429	229,151
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	236,150	215,098
Gross Unrealized Gains	2,474	1,027
Gross Unrealized Losses	(102)	(600)
Estimated Fair Value (Net Carrying Amount)	238,522	215,525
Non-U.S. government securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15,147	13,209
Gross Unrealized Gains	109	8
Gross Unrealized Losses	(7)	(40)
Estimated Fair Value (Net Carrying Amount)	15,249	13,177
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,623
Gross Unrealized Gains	35
Gross Unrealized Losses	0
Estimated Fair Value (Net Carrying Amount)	$ 3,658
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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