Financial Instruments (Details) - USD ($) $ in Thousands	Apr. 02, 2016	Mar. 28, 2015
Available-for-sale securities
Amortized Cost	$ 3,494,356	$ 3,471,735
Available-for-sale Securities, Gross Unrealized Gains (Instant)	16,268	10,961
Available-for-sale Securities, Gross Unrealized Losses (Instant)	(18,302)	(11,340)
Available-for-sale Securities, Noncurrent	220,807	266,902
Estimated Fair Value	3,492,322	3,471,356
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	285,805	118,042
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,036,440	1,214,014
Money Market Funds [Member]
Available-for-sale securities
Amortized Cost	232,698	235,583
Available-for-sale Securities, Gross Unrealized Gains (Instant)	0	0
Available-for-sale Securities, Gross Unrealized Losses (Instant)	0	0
Estimated Fair Value	232,698	235,583
financial institution securities [Member]
Available-for-sale securities
Amortized Cost	284,853	304,999
Available-for-sale Securities, Gross Unrealized Gains (Instant)	0	0
Available-for-sale Securities, Gross Unrealized Losses (Instant)	0	0
Estimated Fair Value	284,853	304,999
Non-financial institution securities [Member]
Available-for-sale securities
Amortized Cost	564,480	429,005
Available-for-sale Securities, Gross Unrealized Gains (Instant)	862	25
Available-for-sale Securities, Gross Unrealized Losses (Instant)	(230)	(6)
Estimated Fair Value	565,112	429,024
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	52,756	7,190
Auction Rate Securities [Member]
Available-for-sale securities
Amortized Cost	10,500	10,500
Available-for-sale Securities, Gross Unrealized Gains (Instant)	0	0
Available-for-sale Securities, Gross Unrealized Losses (Instant)	(523)	(188)
Available-for-sale Securities, Noncurrent	9,977	10,312
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	9,977	10,312
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	9,977	10,312
Municipal Bonds [Member]
Available-for-sale securities
Amortized Cost	68,938	49,064
Available-for-sale Securities, Gross Unrealized Gains (Instant)	877	744
Available-for-sale Securities, Gross Unrealized Losses (Instant)	(133)	(152)
Estimated Fair Value	69,682	49,656
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3,867	1,931
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	14,005	11,945
U.S. Government and Agency Securities [Member]
Available-for-sale securities
Amortized Cost	192,291	757,954
Available-for-sale Securities, Gross Unrealized Gains (Instant)	73	91
Available-for-sale Securities, Gross Unrealized Losses (Instant)	(71)	(129)
Estimated Fair Value	192,293	757,916
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	84,024	451,296
Foreign Government and Agency Securities [Member]
Available-for-sale securities
Amortized Cost	313,168	197,932
Available-for-sale Securities, Gross Unrealized Gains (Instant)	0	0
Available-for-sale Securities, Gross Unrealized Losses (Instant)	0	0
Estimated Fair Value	313,168	197,932
Mortgage-Backed Securities [Member]
Available-for-sale securities
Amortized Cost	1,200,071	1,035,598
Available-for-sale Securities, Gross Unrealized Gains (Instant)	12,848	8,809
Available-for-sale Securities, Gross Unrealized Losses (Instant)	(5,380)	(4,171)
Estimated Fair Value	1,207,539	1,040,236
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	114,285	48,263
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	460,845	491,049
Asset-backed Securities [Member]
Available-for-sale securities
Amortized Cost	216,068	211,487
Available-for-sale Securities, Gross Unrealized Gains (Instant)	1,151	1,130
Available-for-sale Securities, Gross Unrealized Losses (Instant)	(605)	(159)
Estimated Fair Value	216,614	212,458
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	20,793	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	101,831	75,009
Debt Mutual Fund [Member]
Available-for-sale securities
Amortized Cost	101,350	101,350
Available-for-sale Securities, Gross Unrealized Gains (Instant)	0	0
Available-for-sale Securities, Gross Unrealized Losses (Instant)	(9,449)	(6,150)
Estimated Fair Value	91,901	95,200
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	91,901	56,592
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	91,901	95,200
Bank Loans [Member]
Available-for-sale securities
Amortized Cost	102,092	98,131
Available-for-sale Securities, Gross Unrealized Gains (Instant)	25	29
Available-for-sale Securities, Gross Unrealized Losses (Instant)	(102)	(60)
Estimated Fair Value	102,015	98,100
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	42,832	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	77,190	65,085
Commercial Mortgage Backed Securities [Member]
Available-for-sale securities
Amortized Cost	207,847	40,132
Available-for-sale Securities, Gross Unrealized Gains (Instant)	432	133
Available-for-sale Securities, Gross Unrealized Losses (Instant)	(1,809)	(325)
Estimated Fair Value	206,470	39,940
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	2,150	944
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 143,911	$ 6,928

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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