Commitments and Contingencies (Loan Contracts with Off-Balance Sheet Commitments) (Details) - USD ($) $ in Thousands	Dec. 28, 2019	Mar. 30, 2019
Loan Contracts with Off-Balance Sheet Commitments
Construction loan contract amount	$ 31,859	$ 28,230
Remaining construction contingent commitment	19,233	15,347
Construction advances
Loan Contracts with Off-Balance Sheet Commitments
Financing Receivable, before Allowance for Credit Loss	$ (12,626)	$ (12,883)