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Fair Value Measurements (Details Textual) (USD $) In Thousands, unless otherwise specified | Sep. 01, 2012 | Mar. 03, 2012
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Fair Value Disclosures [Abstract] |  |
Short-term marketable securities available for sale | $ 25,091 | $ 11,664
Available-for-sale Securities, Debt Securities, Noncurrent | 9,399 | 7,936
Restricted short-term investments | 13,615 | 13,603
Restricted Cash and Cash Equivalents, Noncurrent | 17,458 | 9,533
Mutual fund investments | $ 700 |

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