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Summary of Significant Accounting Policies (Receivables and Allowances) (Details) - USD ($)
Mar. 30, 2019
Mar. 31, 2018
Apr. 01, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for loan losses $ 180,000 $ 42,000 $ 210,000
Factory-built housing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for doubtful accounts receivable $ 0 $ 0