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Summary of Significant Accounting Policies (Receivables and Allowances) (Details) - USD ($) | Mar. 30, 2019 | Mar. 31, 2018 | Apr. 01, 2017
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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 |

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