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	$ 73,974	$ 62,048
Gross Unrealized Gains	10	16
Gross Unrealized Losses	(509)	(508)
Estimated Fair Value	73,475	61,556
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Cost	61,920	140,425
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	61,920	140,425
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Cost	14,526	13,865
Gross Unrealized Gains	9	5
Gross Unrealized Losses	(19)	(23)
Estimated Fair Value	14,516	13,847
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Cost	107,764	96,660
Gross Unrealized Gains	71	42
Gross Unrealized Losses	(226)	(326)
Estimated Fair Value	107,609	96,376
International government bonds
Schedule of Available-for-sale Securities [Line Items]
Cost	5,424	5,423
Gross Unrealized Gains	4	2
Gross Unrealized Losses	(13)	(15)
Estimated Fair Value	5,415	5,410
Corporate commercial paper
Schedule of Available-for-sale Securities [Line Items]
Cost		4,898
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Estimated Fair Value		4,898
Bank deposits
Schedule of Available-for-sale Securities [Line Items]
Cost	12,646	12,305
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	12,646	12,305
Repurchase agreements
Schedule of Available-for-sale Securities [Line Items]
Cost	38	173
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	38	173
Total available-for-sale investments
Schedule of Available-for-sale Securities [Line Items]
Cost	276,292	335,797
Gross Unrealized Gains	94	65
Gross Unrealized Losses	(767)	(872)
Estimated Fair Value	275,619	334,990
Less amounts classified as cash equivalents
Schedule of Available-for-sale Securities [Line Items]
Cost	61,958	143,498
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	61,958	143,498
Short-term investments
Schedule of Available-for-sale Securities [Line Items]
Cost	214,334	192,299
Gross Unrealized Gains	94	65
Gross Unrealized Losses	(767)	(872)
Estimated Fair Value	$ 213,661	$ 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=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.

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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
-Name Accounting Standards Codification
-Topic 320
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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
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