Investments - Available-For-Sale Investments (Details) - USD ($) $ in Thousands	Apr. 02, 2017	Apr. 03, 2016
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	$ 191,492	$ 151,233
Total available-for-sale investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	335,797	275,629
Gross Unrealized Gains	65	409
Gross Unrealized Losses	(872)	(187)
Estimated Fair Value	334,990	275,851
U.S. government treasuries and agencies securities
Schedule of Available-for-sale Securities [Line Items]
Cost	62,048	32,374
Gross Unrealized Gains	16	146
Gross Unrealized Losses	(508)	(1)
Estimated Fair Value	61,556	32,519
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Cost	140,425	124,504
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	140,425	124,504
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Cost	13,865	10,518
Gross Unrealized Gains	5	4
Gross Unrealized Losses	(23)	(7)
Estimated Fair Value	13,847	10,515
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Cost	96,660	91,321
Gross Unrealized Gains	42	246
Gross Unrealized Losses	(326)	(179)
Estimated Fair Value	96,376	91,388
International government bonds
Schedule of Available-for-sale Securities [Line Items]
Cost	5,423	2,195
Gross Unrealized Gains	2	13
Gross Unrealized Losses	(15)	0
Estimated Fair Value	5,410	2,208
Corporate commercial paper
Schedule of Available-for-sale Securities [Line Items]
Cost	4,898	1,992
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	4,898	1,992
Bank deposits
Schedule of Available-for-sale Securities [Line Items]
Cost	12,305	11,711
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	12,305	11,711
Repurchase agreements
Schedule of Available-for-sale Securities [Line Items]
Cost	173
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	173	114
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Cost		900
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Estimated Fair Value		900
Less amounts classified as cash equivalents
Schedule of Available-for-sale Securities [Line Items]
Cost	143,498	124,618
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	143,498	124,618
Short-term investments
Schedule of Available-for-sale Securities [Line Items]
Cost	192,299	151,011
Gross Unrealized Gains	65	409
Gross Unrealized Losses	(872)	(187)
Estimated Fair Value	$ 191,492	$ 151,233

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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