Financial Instruments (Details) - USD ($) $ in Thousands	Jul. 02, 2016	Apr. 02, 2016
Available-for-sale securities
Amortized Cost	$ 3,643,098	$ 3,494,356
Gross Unrealized Gains	21,985	16,268
Gross Unrealized Losses	18,090	18,302
Estimated Fair Value	3,646,993	3,492,322
Money Market Funds [Member]
Available-for-sale securities
Amortized Cost	275,694	232,698
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	275,694	232,698
Financial institution securities [Member]
Available-for-sale securities
Amortized Cost	508,544	284,853
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	508,544	284,853
Non-financial institution securities [Member]
Available-for-sale securities
Amortized Cost	584,819	564,480
Gross Unrealized Gains	1,819	862
Gross Unrealized Losses	33	230
Estimated Fair Value	586,605	565,112
Auction Rate Securities [Member]
Available-for-sale securities
Amortized Cost	10,500	10,500
Gross Unrealized Gains	0	0
Gross Unrealized Losses	432	523
Estimated Fair Value	10,068	9,977
Municipal Bonds [Member]
Available-for-sale securities
Amortized Cost	55,964	68,938
Gross Unrealized Gains	1,053	877
Gross Unrealized Losses	80	133
Estimated Fair Value	56,937	69,682
U.S. Government and Agency Securities [Member]
Available-for-sale securities
Amortized Cost	97,441	192,291
Gross Unrealized Gains	55	73
Gross Unrealized Losses	98	71
Estimated Fair Value	97,398	192,293
Foreign Government and Agency Securities [Member]
Available-for-sale securities
Amortized Cost	272,711	313,168
Gross Unrealized Gains	0	0
Gross Unrealized Losses	9	0
Estimated Fair Value	272,702	313,168
Mortgage-Backed Securities [Member]
Available-for-sale securities
Amortized Cost	1,211,457	1,200,071
Gross Unrealized Gains	16,330	12,848
Gross Unrealized Losses	4,678	5,380
Estimated Fair Value	1,223,109	1,207,539
Asset-backed Securities [Member]
Available-for-sale securities
Amortized Cost	213,753	216,068
Gross Unrealized Gains	1,508	1,151
Gross Unrealized Losses	349	605
Estimated Fair Value	214,912	216,614
Debt Mutual Fund [Member]
Available-for-sale securities
Amortized Cost	101,350	101,350
Gross Unrealized Gains	0	0
Gross Unrealized Losses	10,297	9,449
Estimated Fair Value	91,053	91,901
Bank Loans [Member]
Available-for-sale securities
Amortized Cost	98,681	102,092
Gross Unrealized Gains	145	25
Gross Unrealized Losses	508	102
Estimated Fair Value	98,318	102,015
Commercial Mortgage Backed Securities [Member]
Available-for-sale securities
Amortized Cost	212,184	207,847
Gross Unrealized Gains	1,075	432
Gross Unrealized Losses	1,606	1,809
Estimated Fair Value	$ 211,653	$ 206,470

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
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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