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Financial Instruments (Details 2) - USD ($) $ in Thousands | Feb. 26, 2022 | Feb. 27, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 11,862 | $ 12,517
Estimated Fair Value | 11,784 | $ 12,893
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost, Due within one year | 1,206 |
Amortized Cost, Due after one year through five years | 9,158 |
Amortized Cost, Due after five years through 10 years | 698 |
Amortized Cost, Due after 15 years | 800 |
Amortized Cost | 11,862 |
Estimated Market Value, Due within one year | 1,212 |
Estimated Market Value, Due after one year through five years | 9,109 |
Estimated Market Value, Due after five years through 10 years | 669 |
Estimated Market Value, After 15 years | 794 |
Estimated Fair Value | $ 11,784 |

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