Financial Instruments (Details 1) - USD ($) $ in Thousands	Jul. 02, 2016	Apr. 02, 2016
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	$ 472,534	$ 750,635
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(4,202)	(5,672)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	235,694	285,805
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	(13,888)	(12,630)
Available-for-Sale Securities, Fair Value, Total	708,228	1,036,440
Available-for-Sale Securities, Gross Unrealized Losses, Total	(18,090)	(18,302)
Non-financial institution securities [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	9,237	52,756
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(32)	(230)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	1,218	0
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	(1)	0
Available-for-Sale Securities, Fair Value, Total	10,455	52,756
Available-for-Sale Securities, Gross Unrealized Losses, Total	(33)	(230)
Auction Rate Securities [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	0	0
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	0	0
Available-for-Sale Securities, 12 Months or Greater, Fair Value	10,068	9,977
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	(432)	(523)
Available-for-Sale Securities, Fair Value, Total	10,068	9,977
Available-for-Sale Securities, Gross Unrealized Losses, Total	(432)	(523)
Municipal Bonds [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	1,550	10,138
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(9)	(44)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	2,962	3,867
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	(71)	(89)
Available-for-Sale Securities, Fair Value, Total	4,512	14,005
Available-for-Sale Securities, Gross Unrealized Losses, Total	(80)	(133)
U.S. Government and Agency Securities [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	32,103	84,024
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(98)	(71)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	0	0
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	0	0
Available-for-Sale Securities, Fair Value, Total	32,103	84,024
Available-for-Sale Securities, Gross Unrealized Losses, Total	(98)	(71)
Foreign Government Debt Securities [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	19,966
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(9)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	0
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	0
Available-for-Sale Securities, Fair Value, Total	19,966
Available-for-Sale Securities, Gross Unrealized Losses, Total	(9)
Mortgage-Backed Securities [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	224,966	346,560
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(2,957)	(3,916)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	105,378	114,285
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	(1,721)	(1,464)
Available-for-Sale Securities, Fair Value, Total	330,344	460,845
Available-for-Sale Securities, Gross Unrealized Losses, Total	(4,678)	(5,380)
Asset-backed Securities [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	44,459	81,038
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(217)	(502)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	9,715	20,793
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	(132)	(103)
Available-for-Sale Securities, Fair Value, Total	54,174	101,831
Available-for-Sale Securities, Gross Unrealized Losses, Total	(349)	(605)
Debt Mutual Fund [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	0	0
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	0	0
Available-for-Sale Securities, 12 Months or Greater, Fair Value	91,053	91,901
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	(10,297)	(9,449)
Available-for-Sale Securities, Fair Value, Total	91,053	91,901
Available-for-Sale Securities, Gross Unrealized Losses, Total	(10,297)	(9,449)
Bank Loans [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	50,001	34,358
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(412)	(31)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	4,865	42,832
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	(96)	(71)
Available-for-Sale Securities, Fair Value, Total	54,866	77,190
Available-for-Sale Securities, Gross Unrealized Losses, Total	(508)	(102)
Commercial Mortgage Backed Securities [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	90,252	141,761
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(468)	(878)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	10,435	2,150
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	(1,138)	(931)
Available-for-Sale Securities, Fair Value, Total	100,687	143,911
Available-for-Sale Securities, Gross Unrealized Losses, Total	$ (1,606)	$ (1,809)

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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