Investments (Continuous Unrealized Loss Positions) (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Mar. 30, 2019
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	$ 4,481	$ 1,662
Unrealized Losses, less than 12 months	(67)	(17)
12 Months or Longer, Fair Value	1,880	8,895
Unrealized losses, 12 months or longer	(27)	(141)
Total Fair Value	6,361	10,557
Unrealized Losses	(94)	(158)
U.S. Treasury and government debt securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value		0
Unrealized Losses, less than 12 months		0
12 Months or Longer, Fair Value		297
Unrealized losses, 12 months or longer		(3)
Total Fair Value		297
Unrealized Losses		(3)
Residential mortgage-backed securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	133	1,066
Unrealized Losses, less than 12 months	0	(9)
12 Months or Longer, Fair Value	1,779	5,206
Unrealized losses, 12 months or longer	(26)	(110)
Total Fair Value	1,912	6,272
Unrealized Losses	(26)	(119)
States and political subdivision debt securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	601	353
Unrealized Losses, less than 12 months	(2)	0
12 Months or Longer, Fair Value	101	2,319
Unrealized losses, 12 months or longer	(1)	(17)
Total Fair Value	702	2,672
Unrealized Losses	(3)	(17)
Corporate debt securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	3,747	243
Unrealized Losses, less than 12 months	(65)	(8)
12 Months or Longer, Fair Value	0	1,073
Unrealized losses, 12 months or longer		(11)
Total Fair Value	3,747	1,316
Unrealized Losses	$ (65)	$ (19)