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Investments (Available-for-sale Summary) (Details) - USD ($) $ in Thousands | Mar. 30, 2019 | Mar. 31, 2018
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Available-for-Sale Securities by Investment Category |  |
Total Amortized Cost | $ 13,443 | $ 16,412
Gross Unrealized Gains | 123 | 110
Gross Unrealized Losses | (158) | (341)
Total Fair Value | 13,408 | 16,181
U.S. Treasury and government debt securities |  |
Available-for-Sale Securities by Investment Category |  |
Total Amortized Cost | 300 | 300
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (3) | (7)
Total Fair Value | 297 | 293
Residential mortgage-backed securities |  |
Available-for-Sale Securities by Investment Category |  |
Total Amortized Cost | 6,625 | 7,654
Gross Unrealized Gains | 3 | 0
Gross Unrealized Losses | (119) | (155)
Total Fair Value | 6,509 | 7,499
States and political subdivision debt securities |  |
Available-for-Sale Securities by Investment Category |  |
Total Amortized Cost | 4,883 | 6,377
Gross Unrealized Gains | 117 | 109
Gross Unrealized Losses | (17) | (149)
Total Fair Value | 4,983 | 6,337
Corporate debt securities |  |
Available-for-Sale Securities by Investment Category |  |
Total Amortized Cost | 1,635 | 2,081
Gross Unrealized Gains | 3 | 1
Gross Unrealized Losses | (19) | (30)
Total Fair Value | $ 1,619 | $ 2,052

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