Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Mar. 02, 2013	Mar. 03, 2012
Cash equivalents
Total cash equivalents	$ 17,639	$ 46,141
Short-term marketable securities available for sale
Total short-term marketable securities available for sale	26,007	11,664
Marketable securities available for sale
Total marketable securities available for sale	12,807	7,936
Restricted investments
Total restricted investments	26,443	23,136
Mutual fund investments
Total mutual fund investments	251	1,150
Total assets at fair value	83,147	90,027
Foreign currency instruments
Foreign currency instruments	405
Total liabilities at fair value	405
Money market funds
Cash equivalents
Total cash equivalents	17,639	46,141
Restricted investments
Total restricted investments	26,443	23,136
Municipal bonds
Short-term marketable securities available for sale
Total short-term marketable securities available for sale	26,007	11,664
Marketable securities available for sale
Total marketable securities available for sale	12,807	7,936
Mutual funds
Mutual fund investments
Total mutual fund investments	251	1,150
Quoted Prices in Active Markets (Level 1)
Cash equivalents
Total cash equivalents	17,639	46,141
Short-term marketable securities available for sale
Total short-term marketable securities available for sale	0	0
Marketable securities available for sale
Total marketable securities available for sale	0	0
Restricted investments
Total restricted investments	26,443	23,136
Mutual fund investments
Total mutual fund investments	251	1,150
Total assets at fair value	44,333	70,427
Foreign currency instruments
Foreign currency instruments	0
Total liabilities at fair value	0
Quoted Prices in Active Markets (Level 1) \| Money market funds
Cash equivalents
Total cash equivalents	17,639	46,141
Restricted investments
Total restricted investments	26,443	23,136
Quoted Prices in Active Markets (Level 1) \| Municipal bonds
Short-term marketable securities available for sale
Total short-term marketable securities available for sale	0	0
Marketable securities available for sale
Total marketable securities available for sale	0	0
Quoted Prices in Active Markets (Level 1) \| Mutual funds
Mutual fund investments
Total mutual fund investments	251	1,150
Other Observable Inputs (Level 2)
Cash equivalents
Total cash equivalents	0	0
Short-term marketable securities available for sale
Total short-term marketable securities available for sale	26,007	11,664
Marketable securities available for sale
Total marketable securities available for sale	12,807	7,936
Restricted investments
Total restricted investments	0	0
Mutual fund investments
Total mutual fund investments	0	0
Total assets at fair value	38,814	19,600
Foreign currency instruments
Foreign currency instruments	405
Total liabilities at fair value	405
Other Observable Inputs (Level 2) \| Money market funds
Cash equivalents
Total cash equivalents	0	0
Restricted investments
Total restricted investments	0	0
Other Observable Inputs (Level 2) \| Municipal bonds
Short-term marketable securities available for sale
Total short-term marketable securities available for sale	26,007	11,664
Marketable securities available for sale
Total marketable securities available for sale	12,807	7,936
Other Observable Inputs (Level 2) \| Mutual funds
Mutual fund investments
Total mutual fund investments	0	0
Unobservable Inputs (Level 3)
Cash equivalents
Total cash equivalents	0	0
Short-term marketable securities available for sale
Total short-term marketable securities available for sale	0	0
Marketable securities available for sale
Total marketable securities available for sale	0	0
Restricted investments
Total restricted investments	0	0
Mutual fund investments
Total mutual fund investments	0	0
Total assets at fair value	0	0
Foreign currency instruments
Foreign currency instruments	0
Total liabilities at fair value	0
Unobservable Inputs (Level 3) \| Money market funds
Cash equivalents
Total cash equivalents	0	0
Restricted investments
Total restricted investments	0	0
Unobservable Inputs (Level 3) \| Municipal bonds
Short-term marketable securities available for sale
Total short-term marketable securities available for sale	0	0
Marketable securities available for sale
Total marketable securities available for sale	0	0
Unobservable Inputs (Level 3) \| Mutual funds
Mutual fund investments
Total mutual fund investments	$ 0	$ 0

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This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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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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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 includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. 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 minimal 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.

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The aggregate value of all restricted investments.

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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 Trading Securities which consist of all investments in certain debt and equity securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected.

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