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Commercial Loans Receivables and Allowance for Loan Loss (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 28, 2020 | Mar. 30, 2019 | Mar. 31, 2018
Receivables [Abstract] |  |  |
Allowance for loan losses | $ 393 | $ 180 | $ 42
Due days for loans accounted for on a non-accrual basis and accruing loans with principal payments past | 90 days or more |  |
Due days for loans on nonaccrual status when interest is past due and remains unpaid | 90 days or more |  |

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