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Receivables (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Apr. 30, 2022 | May 01, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable, allowance for doubtful account, net | $ 2,754 | $ 3,942
Accounts receivable | 101,099 | 67,808
Financing receivable | 4,288 | 3,097
Retainage on construction-type contracts |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable | 1,834 | 660
Financing receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Long-term receivables | $ 4,364 | $ 3,438
Financing receivable | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Contract receivables, annual interest rates | 0.00% |
Financing receivable | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Contract receivables, annual interest rates | 9.00% |

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