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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Dec. 01, 2012 | Mar. 03, 2012
--- | --- | ---
Cash equivalents |  |
Total cash equivalents | $ 17,886 | $ 46,141
Short-term marketable securities available for sale [Abstract] |  |
Available for Sale Securities, current, fair value disclosure | 25,154 | 11,664
Marketable securities available for sale |  |
Total marketable securities available for sale | 10,356 | 7,936
Restricted investments |  |
Total restricted investments | 26,682 | 23,136
Mutual fund investments |  |
Total mutual fund investments | 174 | 1,150
Total assets at fair value | 80,252 | 90,027
Money market funds [Member] |  |
Cash equivalents |  |
Total cash equivalents | 17,886 | 46,141
Restricted investments |  |
Total restricted investments | 26,682 | 23,136
Municipal bonds [Member] |  |
Short-term marketable securities available for sale [Abstract] |  |
Available for Sale Securities, current, fair value disclosure | 25,154 | 11,664
Marketable securities available for sale |  |
Total marketable securities available for sale | 10,356 | 7,936
Mutual funds [Member] |  |
Mutual fund investments |  |
Total mutual fund investments | 174 | 1,150
Quoted Prices in Active Markets (Level 1) [Member] |  |
Cash equivalents |  |
Total cash equivalents | 17,886 | 46,141
Short-term marketable securities available for sale [Abstract] |  |
Available for Sale Securities, current, fair value disclosure | 0 | 0
Marketable securities available for sale |  |
Total marketable securities available for sale | 0 | 0
Restricted investments |  |
Total restricted investments | 26,682 | 23,136
Mutual fund investments |  |
Total mutual fund investments | 174 | 1,150
Total assets at fair value | 44,742 | 70,427
Quoted Prices in Active Markets (Level 1) [Member] | Money market funds [Member] |  |
Cash equivalents |  |
Total cash equivalents | 17,886 | 46,141
Restricted investments |  |
Total restricted investments | 26,682 | 23,136
Quoted Prices in Active Markets (Level 1) [Member] | Municipal bonds [Member] |  |
Short-term marketable securities available for sale [Abstract] |  |
Available for Sale Securities, current, fair value disclosure | 0 | 0
Marketable securities available for sale |  |
Total marketable securities available for sale | 0 | 0
Quoted Prices in Active Markets (Level 1) [Member] | Mutual funds [Member] |  |
Mutual fund investments |  |
Total mutual fund investments | 174 | 1,150
Other Observable Inputs (Level 2) [Member] |  |
Cash equivalents |  |
Total cash equivalents | 0 | 0
Short-term marketable securities available for sale [Abstract] |  |
Available for Sale Securities, current, fair value disclosure | 25,154 | 11,664
Marketable securities available for sale |  |
Total marketable securities available for sale | 10,356 | 7,936
Restricted investments |  |
Total restricted investments | 0 | 0
Mutual fund investments |  |
Total mutual fund investments | 0 | 0
Total assets at fair value | 35,510 | 19,600
Other Observable Inputs (Level 2) [Member] | Money market funds [Member] |  |
Cash equivalents |  |
Total cash equivalents | 0 | 0
Restricted investments |  |
Total restricted investments | 0 | 0
Other Observable Inputs (Level 2) [Member] | Municipal bonds [Member] |  |
Short-term marketable securities available for sale [Abstract] |  |
Available for Sale Securities, current, fair value disclosure | 25,154 | 11,664
Marketable securities available for sale |  |
Total marketable securities available for sale | 10,356 | 7,936
Other Observable Inputs (Level 2) [Member] | Mutual funds [Member] |  |
Mutual fund investments |  |
Total mutual fund investments | 0 | 0
Unobservable Inputs (Level 3) [Member] |  |
Cash equivalents |  |
Total cash equivalents | 0 | 0
Short-term marketable securities available for sale [Abstract] |  |
Available for Sale Securities, current, fair value disclosure | 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
Unobservable Inputs (Level 3) [Member] | Money market funds [Member] |  |
Cash equivalents |  |
Total cash equivalents | 0 | 0
Restricted investments |  |
Total restricted investments | 0 | 0
Unobservable Inputs (Level 3) [Member] | Municipal bonds [Member] |  |
Short-term marketable securities available for sale [Abstract] |  |
Available for Sale Securities, current, fair value disclosure | 0 | 0
Marketable securities available for sale |  |
Total marketable securities available for sale | 0 | 0
Unobservable Inputs (Level 3) [Member] | Mutual funds [Member] |  |
Mutual fund investments |  |
Total mutual fund investments | $ 0 | $ 0

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- 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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