Investments (Available-for-Sale) (Details) - USD ($) $ in Thousands	Jan. 03, 2016	Mar. 29, 2015
U.S. government treasuries and agencies securities
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 62,583	$ 135,570
Gross Unrealized Gains	0	398
Gross Unrealized Losses	(149)	(23)
Estimated Fair Value	(62,434)	(135,945)
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Cost	70,960	55,578
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	(70,960)	(55,578)
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Cost	14,533	31,830
Gross Unrealized Gains	0	9
Gross Unrealized Losses	(32)	(9)
Estimated Fair Value	(14,501)	(31,830)
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Cost	108,682	245,229
Gross Unrealized Gains	18	567
Gross Unrealized Losses	(386)	(121)
Estimated Fair Value	(108,314)	(245,675)
International government bonds
Schedule of Available-for-sale Securities [Line Items]
Cost	0	1,010
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(4)
Estimated Fair Value	0	(1,006)
Corporate commercial paper
Schedule of Available-for-sale Securities [Line Items]
Cost	3,483	4,999
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	(3,483)	(4,999)
Bank deposits
Schedule of Available-for-sale Securities [Line Items]
Cost	13,595	16,915
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	(13,595)	(16,915)
Repurchase agreements
Schedule of Available-for-sale Securities [Line Items]
Cost	129	191
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	(129)	(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)
Total available-for-sale investments
Schedule of Available-for-sale Securities [Line Items]
Cost	274,865	497,323
Gross Unrealized Gains	18	1,019
Gross Unrealized Losses	(567)	(159)
Estimated Fair Value	(274,316)	(498,183)
Less amounts classified as cash equivalents
Schedule of Available-for-sale Securities [Line Items]
Cost	74,996	60,068
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	(74,996)	(60,068)
Short-term investments
Schedule of Available-for-sale Securities [Line Items]
Cost	199,869	437,255
Gross Unrealized Gains	18	1,019
Gross Unrealized Losses	(567)	(159)
Estimated Fair Value	$ (199,320)	$ (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=27724398&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
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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 320
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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
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