Investments (Unrealized Losses and Fair Value by Length of Time) (Details) - USD ($) $ in Thousands	Sep. 28, 2019	Mar. 30, 2019
Debt Securities in a Continuous Unrealized Loss Position
Less than 12 Months, Fair Value	$ 971	$ 1,662
Less than 12 month, Unrealized Losses	(1)	(17)
12 Months or Longer, Fair Value	4,396	8,895
12 Months or Longer, Unrealized Losses	(58)	(141)
Debt Securities, Available-for-sale, Unrealized Loss Position	5,367	10,557
Gross Unrealized Losses	(59)	(158)
Residential mortgage-backed securities
Debt Securities in a Continuous Unrealized Loss Position
Less than 12 Months, Fair Value	669	1,066
Less than 12 month, Unrealized Losses	0	(9)
12 Months or Longer, Fair Value	3,197	5,206
12 Months or Longer, Unrealized Losses	(48)	(110)
Debt Securities, Available-for-sale, Unrealized Loss Position	3,866	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	103	2,319
12 Months or Longer, Unrealized Losses	(2)	(17)
Debt Securities, Available-for-sale, Unrealized Loss Position	405	2,672
Gross Unrealized Losses	(3)	(17)
Corporate Debt Securities
Debt Securities in a Continuous Unrealized Loss Position
Less than 12 Months, Fair Value	0	243
Less than 12 month, Unrealized Losses	0	(8)
12 Months or Longer, Fair Value	1,096	1,073
12 Months or Longer, Unrealized Losses	(8)	(11)
Debt Securities, Available-for-sale, Unrealized Loss Position	1,096	1,316
Gross Unrealized Losses	$ (8)	(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)