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Investments (Available-for-sale Summary) (Details) - USD ($) $ in Thousands | Mar. 28, 2020 | Mar. 30, 2019
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Available-for-Sale Securities by Investment Category |  |
Total Amortized Cost | $ 14,660 | $ 13,443
Gross Unrealized Gains | 208 | 123
Gross Unrealized Losses | (94) | (158)
Total Fair Value | 14,774 | 13,408
U.S. Treasury and government debt securities |  |
Available-for-Sale Securities by Investment Category |  |
Total Amortized Cost |  | 300
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (3)
Total Fair Value |  | 297
Residential mortgage-backed securities |  |
Available-for-Sale Securities by Investment Category |  |
Total Amortized Cost | 5,400 | 6,625
Gross Unrealized Gains | 69 | 3
Gross Unrealized Losses | (26) | (119)
Total Fair Value | 5,443 | 6,509
States and political subdivision debt securities |  |
Available-for-Sale Securities by Investment Category |  |
Total Amortized Cost | 4,239 | 4,883
Gross Unrealized Gains | 134 | 117
Gross Unrealized Losses | (3) | (17)
Total Fair Value | 4,370 | 4,983
Corporate debt securities |  |
Available-for-Sale Securities by Investment Category |  |
Total Amortized Cost | 5,021 | 1,635
Gross Unrealized Gains | 5 | 3
Gross Unrealized Losses | (65) | (19)
Total Fair Value | $ 4,961 | $ 1,619

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