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Investments (Available-for-sale Summary) (Details) - USD ($) $ in Thousands | Apr. 03, 2021 | Mar. 28, 2020
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Available-for-Sale Securities by Investment Category |  |
Total Amortized Cost | $ 14,823 | $ 14,660
Gross Unrealized Gains | 166 | 208
Gross Unrealized Losses | (43) | (94)
Total Fair Value | 14,946 | 14,774
Residential mortgage-backed securities |  |
Available-for-Sale Securities by Investment Category |  |
Total Amortized Cost | 2,787 | 5,400
Gross Unrealized Gains | 30 | 69
Gross Unrealized Losses | (13) | (26)
Total Fair Value | 2,804 | 5,443
States and political subdivision debt securities |  |
Available-for-Sale Securities by Investment Category |  |
Total Amortized Cost | 7,239 | 4,239
Gross Unrealized Gains | 125 | 134
Gross Unrealized Losses | (19) | (3)
Total Fair Value | 7,345 | 4,370
Corporate debt securities |  |
Available-for-Sale Securities by Investment Category |  |
Total Amortized Cost | 4,797 | 5,021
Gross Unrealized Gains | 11 | 5
Gross Unrealized Losses | (11) | (65)
Total Fair Value | $ 4,797 | $ 4,961

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