Fair Value Of Financial Instruments (Schedule Of Cash And Marketable Securities) (Details) (USD $) In Thousands	Sep. 24, 2011	Mar. 26, 2011
Amortized Cost	$ 146,047	$ 205,411
Gross Unrealized Gains	19	65
Gross Unrealized Losses	(133)	(47)
Estimated Fair Value (Net Carrying Amount)	145,933	205,429
Corporate Debt Securities [Member]
Amortized Cost	55,562	64,227
Gross Unrealized Gains	4	23
Gross Unrealized Losses	(116)	(38)
Estimated Fair Value (Net Carrying Amount)	55,450	64,212
Money-Market Funds [Member]
Amortized Cost	16,545	17,700
Estimated Fair Value (Net Carrying Amount)	16,545	17,700
U.S. Treasury Securities [Member]
Amortized Cost	22,076	45,768
Gross Unrealized Gains	1	13
Gross Unrealized Losses	(5)
Estimated Fair Value (Net Carrying Amount)	22,072	45,781
Agency Discount Notes [Member]
Amortized Cost	16,382	16,588
Gross Unrealized Gains	10	5
Gross Unrealized Losses	(1)	(2)
Estimated Fair Value (Net Carrying Amount)	16,391	16,591
Commercial Paper [Member]
Amortized Cost	35,482	61,128
Gross Unrealized Gains	4	24
Gross Unrealized Losses	(11)	(7)
Estimated Fair Value (Net Carrying Amount)	$ 35,475	$ 61,145

- Definition

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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