Marketable Securities (Schedule Of Available-for-sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 26, 2011
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 118,783	$ 172,214
Gross Unrealized Gains	47	63
Gross Unrealized Losses	(39)	(47)
Estimated Fair Value (Net Carrying Amount)	118,791	172,230
Corporate Securities - U.S. [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	48,011	64,228
Gross Unrealized Gains	33	22
Gross Unrealized Losses	(19)	(38)
Estimated Fair Value (Net Carrying Amount)	48,025	64,212
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	30,264	35,268
Gross Unrealized Gains	1	13
Gross Unrealized Losses	(4)
Estimated Fair Value (Net Carrying Amount)	30,261	35,281
Agency Discount Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	16,789	16,588
Gross Unrealized Gains	8	5
Gross Unrealized Losses	(1)	(2)
Estimated Fair Value (Net Carrying Amount)	16,796	16,591
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	23,719	56,130
Gross Unrealized Gains	5	23
Gross Unrealized Losses	(15)	(7)
Estimated Fair Value (Net Carrying Amount)	23,709	56,146
Within One Year [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	115,871	159,516
Estimated Fair Value (Net Carrying Amount)	115,876	159,528
After One Year [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,912	12,698
Estimated Fair Value (Net Carrying Amount)	$ 2,915	$ 12,702

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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