Investments - Amortized Cost and Fair Value of Available-For-Sale Investments (Details) - USD ($) $ in Thousands	Apr. 01, 2018	Apr. 02, 2017
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	$ 222,026	$ 191,492
Total available-for-sale investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	294,982	335,797
Gross Unrealized Gains	43	65
Gross Unrealized Losses	(2,720)	(872)
Estimated Fair Value	292,305	334,990
U.S. government treasuries and agencies securities
Schedule of Available-for-sale Securities [Line Items]
Cost	61,166	62,048
Gross Unrealized Gains	0	16
Gross Unrealized Losses	(894)	(508)
Estimated Fair Value	60,272	61,556
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Cost	48,847	140,425
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	48,847	140,425
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Cost	16,797	13,865
Gross Unrealized Gains	0	5
Gross Unrealized Losses	(110)	(23)
Estimated Fair Value	16,687	13,847
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Cost	111,266	96,660
Gross Unrealized Gains	43	42
Gross Unrealized Losses	(1,704)	(326)
Estimated Fair Value	109,605	96,376
International government bonds
Schedule of Available-for-sale Securities [Line Items]
Cost	2,650	5,423
Gross Unrealized Gains	0	2
Gross Unrealized Losses	(12)	(15)
Estimated Fair Value	2,638	5,410
Corporate commercial paper
Schedule of Available-for-sale Securities [Line Items]
Cost	9,034	4,898
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	9,034	4,898
Bank deposits
Schedule of Available-for-sale Securities [Line Items]
Cost	45,080	12,305
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	45,080	12,305
Repurchase agreements
Schedule of Available-for-sale Securities [Line Items]
Cost	142	173
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	142	173
Less amounts classified as cash equivalents
Schedule of Available-for-sale Securities [Line Items]
Cost	70,279	143,498
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	70,279	143,498
Short-term investments
Schedule of Available-for-sale Securities [Line Items]
Cost	224,703	192,299
Gross Unrealized Gains	43	65
Gross Unrealized Losses	(2,720)	(872)
Estimated Fair Value	$ 222,026	$ 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.

+ 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=82897076&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=75030427&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=82896770&loc=d3e26626-111562

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