Marketable Securities (Schedule of Available-for-sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 27, 2014	Mar. 29, 2014
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	$ 109,465	$ 352,660
Gross Unrealized Gains	15	73
Gross Unrealized Losses	(104)	(253)
Amortized Cost	109,554	352,840
Corporate Debt Securities - U.S. [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	81,470	246,685
Gross Unrealized Gains	11	52
Gross Unrealized Losses	(92)	(245)
Amortized Cost	81,551	246,878
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	16,500	56,994
Gross Unrealized Gains		10
Gross Unrealized Losses	(5)	(2)
Amortized Cost	16,505	56,986
Agency Discount Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value		2,009
Gross Unrealized Gains		1
Amortized Cost		2,008
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	11,495	41,970
Gross Unrealized Gains	4	10
Gross Unrealized Losses	(7)	(2)
Amortized Cost	11,498	41,962
Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value		5,002
Gross Unrealized Losses		(4)
Amortized Cost		$ 5,006

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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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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Amount of debt securities categorized neither as held-to-maturity nor trading.

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