Marketable Securities (Schedule of Available-for-sale Securities) (Details) - USD ($) $ in Thousands	Mar. 30, 2019	Mar. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 228,757	$ 201,325
Gross Unrealized Gains	1,035	4
Gross Unrealized Losses	(641)	(2,433)
Estimated Fair Value (Net Carrying Amount)	229,151	198,896
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	215,098	185,636
Gross Unrealized Gains	1,027	4
Gross Unrealized Losses	(600)	(2,318)
Estimated Fair Value (Net Carrying Amount)	215,525	183,322
Non-US government securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	13,209	14,730
Gross Unrealized Gains	8	0
Gross Unrealized Losses	(40)	(111)
Estimated Fair Value (Net Carrying Amount)	13,177	14,619
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		500
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Estimated Fair Value (Net Carrying Amount)		500
Agency discount notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	450	459
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	(4)
Estimated Fair Value (Net Carrying Amount)	$ 449	$ 455

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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Amount, before tax, of unrealized loss 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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Amount of 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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