Investments - Available-For-Sale Investments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 29, 2015	Mar. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	$ 438,115	$ 362,604
Total available-for-sale investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	497,323	424,675
Gross Unrealized Gains	1,019	454
Gross Unrealized Losses	(159)	(254)
Estimated Fair Value	498,183	424,875
U.S. government treasuries and agencies securities
Schedule of Available-for-sale Securities [Line Items]
Cost	135,570	112,268
Gross Unrealized Gains	398	76
Gross Unrealized Losses	(23)	(91)
Estimated Fair Value	135,945	112,253
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Cost	55,578	53,430
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	55,578	53,430
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Cost	31,830	22,330
Gross Unrealized Gains	9	11
Gross Unrealized Losses	(9)	(9)
Estimated Fair Value	31,830	22,332
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Cost	245,229	199,598
Gross Unrealized Gains	567	335
Gross Unrealized Losses	(121)	(127)
Estimated Fair Value	245,675	199,806
International government bonds
Schedule of Available-for-sale Securities [Line Items]
Cost	1,010	3,023
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(4)	(9)
Estimated Fair Value	1,006	3,014
Corporate commercial paper
Schedule of Available-for-sale Securities [Line Items]
Cost	4,999	6,246
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	4,999	6,246
Bank deposits
Schedule of Available-for-sale Securities [Line Items]
Cost	16,915	18,538
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	16,915	18,538
Repurchase agreements
Schedule of Available-for-sale Securities [Line Items]
Cost	191	46
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	191	46
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Cost	6,001	9,196
Gross Unrealized Gains	45	32
Gross Unrealized Losses	(2)	(18)
Estimated Fair Value	6,044	9,210
Less amounts classified as cash equivalents
Schedule of Available-for-sale Securities [Line Items]
Cost	60,068	62,671
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	60,068	62,671
Short-term investments
Schedule of Available-for-sale Securities [Line Items]
Cost	437,255	362,004
Gross Unrealized Gains	1,019	454
Gross Unrealized Losses	(159)	(254)
Estimated Fair Value	$ 438,115	$ 362,204

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

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-Section 50

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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 trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

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