Investments (Amortized cost and fair value) (Details) - USD ($) $ in Thousands	Oct. 02, 2021	Apr. 03, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 18,089	$ 14,823
Fair Value	18,179	14,946
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,352	2,787
Fair Value	2,365	2,804
State and political subdivision debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7,942	7,239
Fair Value	8,023	7,345
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7,795	4,797
Fair Value	$ 7,791	$ 4,797