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v3.23.2

Nature of Business and Summary of Significant Accounting Policies (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Apr. 29, 2023 | Apr. 30, 2022 | May 01, 2021
Segment Reporting Information [Line Items] |  |  |
Contract with customer assets | $ 46,789 | $ 41,687 |
Gross profit | 151,355 | 116,697 | $ 120,583
Equity method investments | 11,934 | 16,916 |
Equity in losses of affiliates | 3,332 | 2,970 | 2,370
Accounts payable | 52 | 296 |
Amount invested | 4,315 | 7,848 | 6,744
Debt conversion, converted instrument, amount | 2,823 |  |
Purchase of convertible notes | 8,789 |  |
Convertible note and investment in affiliates, amount | 20,723 | 24,404 |
Cash and cash equivalents | 23,982 | 17,143 | 77,590
Capitalized contract cost, net | 860 | 117 |
Operating income | 21,388 | 4,046 | 17,108
Cash flow from operating activity | 15,024 | (27,035) | 66,212
Geographic Distribution, Foreign |  |  |
Segment Reporting Information [Line Items] |  |  |
Cash and cash equivalents | 8,087 |  |
Subsidiaries | Geographic Distribution, Foreign |  |  |
Segment Reporting Information [Line Items] |  |  |
Cash and cash equivalents | 7,651 |  |
Variable Interest Entity, Primary Beneficiary |  |  |
Segment Reporting Information [Line Items] |  |  |
Contract with customer assets | 5,223 |  |
Gross profit | 2,748 |  |
United States of America, Dollars |  |  |
Segment Reporting Information [Line Items] |  |  |
Cash and cash equivalents | 15,895 |  |
United States of America, Dollars | Subsidiaries |  |  |
Segment Reporting Information [Line Items] |  |  |
Cash and cash equivalents | 1,300 |  |
Product Design And Development |  |  |
Segment Reporting Information [Line Items] |  |  |
Related party transaction, amounts of transaction | 672 | $ 1,520 | $ 460
Miortech |  |  |
Segment Reporting Information [Line Items] |  |  |
Impairment | $ 4,473 |  |
Equity method investment, ownership percentage | 55.90% |  |
XdisplayTM |  |  |
Segment Reporting Information [Line Items] |  |  |
Equity method investment, ownership percentage | 16.40% |  |
Convertible Debt |  |  |
Segment Reporting Information [Line Items] |  |  |
Amount invested | $ 3,000 |  |
Commercial Paper |  |  |
Segment Reporting Information [Line Items] |  |  |
Amount invested | $ 1,315 |  |
Stock options |  |  |
Segment Reporting Information [Line Items] |  |  |
Antidilutive securities excluded from computation of earnings per share, amount (in shares) | 2,084 | 1,846 | 2,262
Antidilutive securities excluded from computation of earnings per share, weighted average exercise price (in dollars per share) | $ 7.47 | $ 9.15 | $ 9.11
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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