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Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 01, 2019 | Mar. 02, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 12,121 |
Estimated Fair Value | 12,300 |
Municipal and Corporate Bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 12,121 | $ 12,481
Gross Unrealized Gains | 181 | 59
Gross Unrealized Losses | 2 | 108
Estimated Fair Value | $ 12,300 | $ 12,432

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