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Investments (Gross Unrealized Gains and Losses by Investment Category) (Details) - USD ($) $ in Thousands | Dec. 26, 2020 | Mar. 28, 2020
--- | --- | ---
Available-for-Sale Securities by Investment Category |  |
Amortized Cost | $ 16,482 | $ 14,660
Gross Unrealized Gains | 211 | 208
Gross Unrealized Losses | (20) | (94)
Available-for-sale debt securities | 16,673 | 14,774
Residential mortgage-backed securities |  |
Available-for-Sale Securities by Investment Category |  |
Amortized Cost | 5,209 | 5,400
Gross Unrealized Gains | 45 | 69
Gross Unrealized Losses | (17) | (26)
Available-for-sale debt securities | 5,237 | 5,443
State and political subdivision debt securities |  |
Available-for-Sale Securities by Investment Category |  |
Amortized Cost | 6,156 | 4,239
Gross Unrealized Gains | 151 | 134
Gross Unrealized Losses | (1) | (3)
Available-for-sale debt securities | 6,306 | 4,370
Corporate debt securities |  |
Available-for-Sale Securities by Investment Category |  |
Amortized Cost | 5,117 | 5,021
Gross Unrealized Gains | 15 | 5
Gross Unrealized Losses | (2) | (65)
Available-for-sale debt securities | $ 5,130 | $ 4,961

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