Investments - Available-for-Sale (Details) - USD ($) $ in Thousands	Jul. 02, 2017	Apr. 02, 2017
U.S. government treasuries and agencies securities
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 72,038	$ 62,048
Gross Unrealized Gains	1	16
Gross Unrealized Losses	(721)	(508)
Estimated Fair Value	71,318	61,556
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Cost	60,818	140,425
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	60,818	140,425
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Cost	15,445	13,865
Gross Unrealized Gains	0	5
Gross Unrealized Losses	(50)	(23)
Estimated Fair Value	15,395	13,847
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Cost	139,775	96,660
Gross Unrealized Gains	56	42
Gross Unrealized Losses	(761)	(326)
Estimated Fair Value	139,070	96,376
International government bonds
Schedule of Available-for-sale Securities [Line Items]
Cost	6,524	5,423
Gross Unrealized Gains	6	2
Gross Unrealized Losses	(20)	(15)
Estimated Fair Value	6,510	5,410
Corporate commercial paper
Schedule of Available-for-sale Securities [Line Items]
Cost	10,139	4,898
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	10,139	4,898
Bank deposits
Schedule of Available-for-sale Securities [Line Items]
Cost	34,133	12,305
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	34,133	12,305
Repurchase agreements
Schedule of Available-for-sale Securities [Line Items]
Cost	97	173
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	97	173
Total available-for-sale investments
Schedule of Available-for-sale Securities [Line Items]
Cost	338,969	335,797
Gross Unrealized Gains	63	65
Gross Unrealized Losses	(1,552)	(872)
Estimated Fair Value	337,480	334,990
Less amounts classified as cash equivalents
Schedule of Available-for-sale Securities [Line Items]
Cost	73,414	143,498
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	73,414	143,498
Short-term investments
Schedule of Available-for-sale Securities [Line Items]
Cost	265,555	192,299
Gross Unrealized Gains	63	65
Gross Unrealized Losses	(1,552)	(872)
Estimated Fair Value	$ 264,066	$ 191,492

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=82897076&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.

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-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
-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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