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Investments (Unrealized Losses and Fair Value by Length of Time) (Details) - USD ($) $ in Thousands | Dec. 28, 2019 | Mar. 30, 2019
--- | --- | ---
Debt Securities in a Continuous Unrealized Loss Position |  |
Less than 12 Months, Fair Value | $ 1,000 | $ 1,662
Less than 12 month, Unrealized Losses | (2) | (17)
12 Months or Longer, Fair Value | 3,248 | 8,895
12 Months or Longer, Unrealized Losses | (49) | (141)
Debt Securities, Available-for-sale, Unrealized Loss Position | 4,248 | 10,557
Gross Unrealized Losses | (51) | (158)
Residential mortgage-backed securities |  |
Debt Securities in a Continuous Unrealized Loss Position |  |
Less than 12 Months, Fair Value | 399 | 1,066
Less than 12 month, Unrealized Losses | 0 | (9)
12 Months or Longer, Fair Value | 2,896 | 5,206
12 Months or Longer, Unrealized Losses | (48) | (110)
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,295 | 6,272
Gross Unrealized Losses | (48) | (119)
State and political subdivision debt securities |  |
Debt Securities in a Continuous Unrealized Loss Position |  |
Less than 12 Months, Fair Value | 302 | 353
Less than 12 month, Unrealized Losses | (1) | 0
12 Months or Longer, Fair Value | 102 | 2,319
12 Months or Longer, Unrealized Losses | (1) | (17)
Debt Securities, Available-for-sale, Unrealized Loss Position | 404 | 2,672
Gross Unrealized Losses | (2) | (17)
Corporate Debt Securities |  |
Debt Securities in a Continuous Unrealized Loss Position |  |
Less than 12 Months, Fair Value | 299 | 243
Less than 12 month, Unrealized Losses | (1) | (8)
12 Months or Longer, Fair Value | 250 | 1,073
12 Months or Longer, Unrealized Losses | 0 | (11)
Debt Securities, Available-for-sale, Unrealized Loss Position | 549 | 1,316
Gross Unrealized Losses | $ (1) | (19)
U.S. Treasury and government debt securities |  |
Debt Securities in a Continuous Unrealized Loss Position |  |
Less than 12 Months, Fair Value |  | 0
Less than 12 month, Unrealized Losses |  | 0
12 Months or Longer, Fair Value |  | 297
12 Months or Longer, Unrealized Losses |  | (3)
Debt Securities, Available-for-sale, Unrealized Loss Position |  | 297
Gross Unrealized Losses |  | $ (3)

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