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Nature of Business and Summary of Significant Accounting Policies (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2022 | May 01, 2021 | May 02, 2020
Segment Reporting Information [Line Items] |  |  |
Equity method investments | $ 16,916 | $ 19,887 |
Equity in losses of affiliates | 2,970 | 2,370 | $ 741
Notes receivable, noncurrent | 7,488 |  |
Related party transaction, amounts of transaction | 1,520 | 460 | $ 1,113
Due to related parties, current | 296 | 470 |
Capitalized contract cost, net | 117 | 492 |
Proceeds from government programs, cares act | 293 | $ 1,757 |
Deferred payroll taxes, cares act | $ 2,633 |  |
Stock options |  |  |
Segment Reporting Information [Line Items] |  |  |
Antidilutive securities excluded from computation of earnings per share, amount (in shares) | 1,846 | 2,262 | 2,198
Antidilutive securities excluded from computation of earnings per share, weighted average exercise price (in dollars per share) | $ 9.15 | $ 9.11 | $ 9.95
Minimum |  |  |
Segment Reporting Information [Line Items] |  |  |
Product warranty accrual, standard parts warranty coverage term (year) | 1 year |  |
Product warranty accrual, installation warranty coverage term (year) | 1 year |  |
Maximum |  |  |
Segment Reporting Information [Line Items] |  |  |
Product warranty accrual, standard parts warranty coverage term (year) | 5 years |  |
Product warranty accrual, installation warranty coverage term (year) | 10 years |  |

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