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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. 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