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Marketable Securities (Details 2) (USD $) In Thousands, unless otherwise specified | Nov. 30, 2013 | Mar. 02, 2013
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Schedule of amortized cost and estimated fair values of investments by contractual maturity |  |
Amortized Cost, Due within one year | $ 2,688 |
Amortized Cost, Due after one year through five years | 2,720 |
Amortized Cost, Due after five years through 10 years | 7,451 |
Amortized Cost, Due after 10 years through 15 years | 1,250 |
Amortized Cost, Due beyond 15 years | 66 |
Amortized Cost, Total | 14,175 |
Estimated Market Value, Due within one year | 2,689 |
Estimated Market Value, Due after one year through five years | 2,743 |
Estimated Market Value, Due after five years through 10 years | 7,272 |
Estimated Market Value, Due after 10 years through 15 years | 1,021 |
Estimated Market Value, Due beyond 15 years | 67 |
Estimated Market Value, Total | $ 13,792 | $ 38,814

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