Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 28, 2015	Mar. 29, 2014
Available-for-sale securities
Amortized Cost	$ 3,471,735	$ 3,606,739
Available-for-sale Securities, Gross Unrealized Gains (Instant)	10,961	16,763
Available-for-sale Securities, Gross Unrealized Losses (Instant)	(11,340)	(18,153)
Available-for-sale Securities, Noncurrent	266,902	1,190,775
Estimated Fair Value	3,471,356us-gaap_AvailableForSaleSecurities	3,605,349us-gaap_AvailableForSaleSecurities
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	118,042	158,767
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,214,014	909,880
Money Market Funds [Member]
Available-for-sale securities
Amortized Cost	235,583	213,988
Available-for-sale Securities, Gross Unrealized Gains (Instant)	0	0
Available-for-sale Securities, Gross Unrealized Losses (Instant)	0	0
Estimated Fair Value	235,583	213,988
financial institution securities [Member]
Available-for-sale securities
Amortized Cost	304,999	366,906
Available-for-sale Securities, Gross Unrealized Gains (Instant)	0	0
Available-for-sale Securities, Gross Unrealized Losses (Instant)	0	0
Estimated Fair Value	304,999	366,906
Non-financial institution securities [Member]
Available-for-sale securities
Amortized Cost	429,005	753,888
Available-for-sale Securities, Gross Unrealized Gains (Instant)	25	3,428
Available-for-sale Securities, Gross Unrealized Losses (Instant)	(6)	(1,244)
Estimated Fair Value	429,024	756,072
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	4,488
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	7,190	116,958
Auction Rate Securities [Member]
Available-for-sale securities
Amortized Cost	10,500	21,500
Available-for-sale Securities, Gross Unrealized Gains (Instant)	0	0
Available-for-sale Securities, Gross Unrealized Losses (Instant)	(188)	(1,340)
Available-for-sale Securities, Noncurrent	10,312	20,160
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	10,312	20,160
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	10,312	20,160
Municipal Bonds [Member]
Available-for-sale securities
Amortized Cost	49,064	31,367
Available-for-sale Securities, Gross Unrealized Gains (Instant)	744	604
Available-for-sale Securities, Gross Unrealized Losses (Instant)	(152)	(205)
Estimated Fair Value	49,656	31,766
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,931	1,743
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	11,945	7,660
U.S. Government and Agency Securities [Member]
Available-for-sale securities
Amortized Cost	757,954	548,568
Available-for-sale Securities, Gross Unrealized Gains (Instant)	91	1,135
Available-for-sale Securities, Gross Unrealized Losses (Instant)	(129)	(184)
Estimated Fair Value	757,916	549,519
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	451,296	118,125
Foreign Government and Agency Securities [Member]
Available-for-sale securities
Amortized Cost	197,932	354,935
Available-for-sale Securities, Gross Unrealized Gains (Instant)	0	0
Available-for-sale Securities, Gross Unrealized Losses (Instant)	0	0
Estimated Fair Value	197,932	354,935
Mortgage-Backed Securities [Member]
Available-for-sale securities
Amortized Cost	1,075,730	1,234,237
Available-for-sale Securities, Gross Unrealized Gains (Instant)	8,942	11,380
Available-for-sale Securities, Gross Unrealized Losses (Instant)	(4,496)	(10,528)
Estimated Fair Value	1,080,176	1,235,089
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	49,207	132,376
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	497,977	590,279
Asset-backed Securities [Member]
Available-for-sale securities
Amortized Cost	211,487	0
Available-for-sale Securities, Gross Unrealized Gains (Instant)	1,130	0
Available-for-sale Securities, Gross Unrealized Losses (Instant)	(159)	0
Estimated Fair Value	212,458	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	75,009
Debt Mutual Fund [Member]
Available-for-sale securities
Amortized Cost	101,350	81,350
Available-for-sale Securities, Gross Unrealized Gains (Instant)	0	216
Available-for-sale Securities, Gross Unrealized Losses (Instant)	(6,150)	(4,652)
Estimated Fair Value	95,200	76,914
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	56,592	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	95,200	56,698
Bank Loans [Member]
Available-for-sale securities
Amortized Cost	98,131	0
Available-for-sale Securities, Gross Unrealized Gains (Instant)	29	0
Available-for-sale Securities, Gross Unrealized Losses (Instant)	(60)	0
Estimated Fair Value	98,100	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 65,085

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

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