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Investments (Unrealized Losses and Fair Value by Length of Time) (Details) - USD ($) $ in Thousands | Jun. 27, 2020 | Mar. 28, 2020
--- | --- | ---
Debt Securities in a Continuous Unrealized Loss Position |  |
Less than 12 Months, Fair Value | $ 1,808 | $ 4,481
Less than 12 month, Unrealized Losses | (25) | (67)
12 Months or Longer, Fair Value | 951 | 1,880
12 Months or Longer, Unrealized Losses | (20) | (27)
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,759 | 6,361
Gross Unrealized Losses | (45) | (94)
Residential mortgage-backed securities |  |
Debt Securities in a Continuous Unrealized Loss Position |  |
Less than 12 Months, Fair Value | 721 | 133
Less than 12 month, Unrealized Losses | (11) | 0
12 Months or Longer, Fair Value | 951 | 1,779
12 Months or Longer, Unrealized Losses | (20) | (26)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,672 | 1,912
Gross Unrealized Losses | (31) | (26)
State and political subdivision debt securities |  |
Debt Securities in a Continuous Unrealized Loss Position |  |
Less than 12 Months, Fair Value | 300 | 601
Less than 12 month, Unrealized Losses | 0 | (2)
12 Months or Longer, Fair Value | 0 | 101
12 Months or Longer, Unrealized Losses | 0 | (1)
Debt Securities, Available-for-sale, Unrealized Loss Position | 300 | 702
Gross Unrealized Losses | 0 | (3)
Corporate Debt Securities |  |
Debt Securities in a Continuous Unrealized Loss Position |  |
Less than 12 Months, Fair Value | 787 | 3,747
Less than 12 month, Unrealized Losses | (14) | (65)
12 Months or Longer, Fair Value | 0 | 0
12 Months or Longer, Unrealized Losses | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 787 | 3,747
Gross Unrealized Losses | $ (14) | $ (65)

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