Fair Value Of Financial Instruments (Schedule Of Carrying Amount And Fair Value Of Cash And Financial Instruments) (Details) (USD $) In Thousands	Sep. 24, 2011	Mar. 26, 2011
Fair Value Of Financial Instruments [Abstract]
Cash, Carrying Amount	$ 5,066	$ 9,626
Cash equivalents, Carrying Amount	34,202	27,413
Restricted investments, Carrying Amount	2,898	5,786
Marketable securities, Carrying Amount	100,130	159,528
Long-term marketable securities, Carrying Amount	8,703	12,702
Financial instruments, Carrying Amount	150,999	215,055
Cash, Fair Value	5,066	9,626
Cash equivalents, Fair Value	34,202	27,413
Restricted investments, Fair Value	2,898	5,786
Marketable securities, Fair Value	100,130	159,528
Long-term marketable securities, Fair Value	8,703	12,702
Financial instruments, Fair Value	$ 150,999	$ 215,055

Cash equivalents, fair value.

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Cash, fair value.

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Financial instruments carrying value.

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Financial instruments fair value.

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Fair value of total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale which are intended to be held for less than one year or the normal operating cycle, whichever is longer.

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Fair Value of Total debt and equity financial instruments including: (1) securities held-to-maturity and (2) securities available-for -sale that will be held for the long-term.

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Unrestricted cash available for day-to-day operating needs, for an entity that has cash equivalents, but does not aggregate cash equivalents with cash on the balance sheet.

+ References

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

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-Glossary Cash

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Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash equivalents may be reported as cash equivalents, while legally restricted equivalents held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular equivalents are not generally reported as part of unrestricted cash equivalents.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale which are intended to be held for less than one year or the normal operating cycle, whichever is longer.

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Total debt and equity financial instruments including: (1) securities held-to-maturity and (2) securities available-for-sale that will be held for the long-term.

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The aggregate value of all restricted investments.

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This element represents the current portion of investments which are not defined as or included in marketable (debt, equity, or other) securities that are pledged or subject to withdrawal restrictions.

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