Investments - Available-For-Sale Investments (Details) - USD ($) $ in Thousands	Apr. 03, 2016	Mar. 29, 2015
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	$ 151,233	$ 438,115
Total available-for-sale investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	275,629	497,323
Gross Unrealized Gains	409	1,019
Gross Unrealized Losses	(187)	(159)
Estimated Fair Value	275,851	498,183
U.S. government treasuries and agencies securities
Schedule of Available-for-sale Securities [Line Items]
Cost	32,374	135,570
Gross Unrealized Gains	146	398
Gross Unrealized Losses	(1)	(23)
Estimated Fair Value	32,519	135,945
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Cost	124,504	55,578
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	124,504	55,578
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Cost	10,518	31,830
Gross Unrealized Gains	4	9
Gross Unrealized Losses	(7)	(9)
Estimated Fair Value	10,515	31,830
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Cost	91,321	245,229
Gross Unrealized Gains	246	567
Gross Unrealized Losses	(179)	(121)
Estimated Fair Value	91,388	245,675
International government bonds
Schedule of Available-for-sale Securities [Line Items]
Cost	2,195	1,010
Gross Unrealized Gains	13	0
Gross Unrealized Losses	0	(4)
Estimated Fair Value	2,208	1,006
Corporate commercial paper
Schedule of Available-for-sale Securities [Line Items]
Cost	1,992	4,999
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	1,992	4,999
Bank deposits
Schedule of Available-for-sale Securities [Line Items]
Cost	11,711	16,915
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	11,711	16,915
Repurchase agreements
Schedule of Available-for-sale Securities [Line Items]
Cost	114	191
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	114	191
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Cost	900	6,001
Gross Unrealized Gains	0	45
Gross Unrealized Losses	0	(2)
Estimated Fair Value	900	6,044
Less amounts classified as cash equivalents
Schedule of Available-for-sale Securities [Line Items]
Cost	124,618	60,068
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	124,618	60,068
Short-term investments
Schedule of Available-for-sale Securities [Line Items]
Cost	151,011	437,255
Gross Unrealized Gains	409	1,019
Gross Unrealized Losses	(187)	(159)
Estimated Fair Value	$ 151,233	$ 438,115

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

+ References

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=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26626-111562

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