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Investments (Unrealized Losses and Fair Value by Length of Time) (Details) - USD ($) $ in Thousands | Dec. 26, 2020 | Mar. 28, 2020
--- | --- | ---
Debt Securities in a Continuous Unrealized Loss Position |  |
Less than 12 Months, Fair Value | $ 1,468 | $ 4,481
Less than 12 month, Unrealized Losses | (12) | (67)
12 Months or Longer, Fair Value | 460 | 1,880
12 Months or Longer, Unrealized Losses | (8) | (27)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,928 | 6,361
Gross Unrealized Losses | (20) | (94)
Residential mortgage-backed securities |  |
Debt Securities in a Continuous Unrealized Loss Position |  |
Less than 12 Months, Fair Value | 342 | 133
Less than 12 month, Unrealized Losses | (9) | 0
12 Months or Longer, Fair Value | 460 | 1,779
12 Months or Longer, Unrealized Losses | (8) | (26)
Debt Securities, Available-for-sale, Unrealized Loss Position | 802 | 1,912
Gross Unrealized Losses | (17) | (26)
State and political subdivision debt securities |  |
Debt Securities in a Continuous Unrealized Loss Position |  |
Less than 12 Months, Fair Value | 321 | 601
Less than 12 month, Unrealized Losses | (1) | (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 | 321 | 702
Gross Unrealized Losses | (1) | (3)
Corporate Debt Securities |  |
Debt Securities in a Continuous Unrealized Loss Position |  |
Less than 12 Months, Fair Value | 805 | 3,747
Less than 12 month, Unrealized Losses | (2) | (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 | 805 | 3,747
Gross Unrealized Losses | $ (2) | $ (65)

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