Investments (Gross Unrealized Gains and Losses by Investment Category) (Details) - USD ($) $ in Thousands	Dec. 28, 2019	Mar. 30, 2019
Available-for-Sale Securities by Investment Category
Amortized Cost	$ 10,283	$ 13,443
Gross Unrealized Gains	159	123
Gross Unrealized Losses	(51)	(158)
Available-for-sale debt securities	10,391	13,408
Residential mortgage-backed securities
Available-for-Sale Securities by Investment Category
Amortized Cost	5,267	6,625
Gross Unrealized Gains	17	3
Gross Unrealized Losses	(48)	(119)
Available-for-sale debt securities	5,236	6,509
State and political subdivision debt securities
Available-for-Sale Securities by Investment Category
Amortized Cost	3,695	4,883
Gross Unrealized Gains	138	117
Gross Unrealized Losses	(2)	(17)
Available-for-sale debt securities	3,831	4,983
Corporate debt securities
Available-for-Sale Securities by Investment Category
Amortized Cost	1,321	1,635
Gross Unrealized Gains	4	3
Gross Unrealized Losses	(1)	(19)
Available-for-sale debt securities	$ 1,324	1,619
U.S. Treasury and government debt securities
Available-for-Sale Securities by Investment Category
Amortized Cost		300
Gross Unrealized Gains		0
Gross Unrealized Losses		(3)
Available-for-sale debt securities		$ 297

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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