Investments (Available-for-Sale) (Details) - USD ($) $ in Thousands	Jul. 03, 2016	Apr. 03, 2016
U.S. government treasuries and agencies securities
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 50,091	$ 32,374
Gross Unrealized Gains	305	146
Gross Unrealized Losses	0	(1)
Estimated Fair Value	50,396	32,519
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Cost	38,408	124,504
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	38,408	124,504
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Cost	10,319	10,518
Gross Unrealized Gains	20	4
Gross Unrealized Losses	(2)	(7)
Estimated Fair Value	10,337	10,515
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Cost	119,967	91,321
Gross Unrealized Gains	456	246
Gross Unrealized Losses	(136)	(179)
Estimated Fair Value	120,287	91,388
International government bonds
Schedule of Available-for-sale Securities [Line Items]
Cost	2,194	2,195
Gross Unrealized Gains	35	13
Gross Unrealized Losses	0	0
Estimated Fair Value	2,229	2,208
Corporate commercial paper
Schedule of Available-for-sale Securities [Line Items]
Cost	5,972	1,992
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	5,972	1,992
Bank deposits
Schedule of Available-for-sale Securities [Line Items]
Cost	10,040	11,711
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	10,040	11,711
Repurchase agreements
Schedule of Available-for-sale Securities [Line Items]
Cost	367	114
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	367	114
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Cost	900	900
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	900	900
Total available-for-sale investments
Schedule of Available-for-sale Securities [Line Items]
Cost	238,258	275,629
Gross Unrealized Gains	816	409
Gross Unrealized Losses	(138)	(187)
Estimated Fair Value	238,936	275,851
Less amounts classified as cash equivalents
Schedule of Available-for-sale Securities [Line Items]
Cost	39,275	124,618
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	39,275	124,618
Short-term investments
Schedule of Available-for-sale Securities [Line Items]
Cost	198,983	151,011
Gross Unrealized Gains	816	409
Gross Unrealized Losses	(138)	(187)
Estimated Fair Value	$ 199,661	$ 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.

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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
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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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