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Investments (Gross Unrealized Gains and Losses by Investment Category) (Details) - USD ($) $ in Thousands | Dec. 28, 2019 | Mar. 30, 2019
--- | --- | ---
Available-for-Sale Securities by Investment Category |  |
Amortized Cost | $ 10,283 | $ 13,443
Gross Unrealized Gains | 159 | 123
Gross Unrealized Losses | (51) | (158)
Available-for-sale debt securities | 10,391 | 13,408
Residential mortgage-backed securities |  |
Available-for-Sale Securities by Investment Category |  |
Amortized Cost | 5,267 | 6,625
Gross Unrealized Gains | 17 | 3
Gross Unrealized Losses | (48) | (119)
Available-for-sale debt securities | 5,236 | 6,509
State and political subdivision debt securities |  |
Available-for-Sale Securities by Investment Category |  |
Amortized Cost | 3,695 | 4,883
Gross Unrealized Gains | 138 | 117
Gross Unrealized Losses | (2) | (17)
Available-for-sale debt securities | 3,831 | 4,983
Corporate debt securities |  |
Available-for-Sale Securities by Investment Category |  |
Amortized Cost | 1,321 | 1,635
Gross Unrealized Gains | 4 | 3
Gross Unrealized Losses | (1) | (19)
Available-for-sale debt securities | $ 1,324 | 1,619
U.S. Treasury and government debt securities |  |
Available-for-Sale Securities by Investment Category |  |
Amortized Cost |  | 300
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (3)
Available-for-sale debt securities |  | $ 297

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