v3.25.2
Nature of Business and Summary of Significant Accounting Policies (Details Textual) - USD ($)
 6 Months Ended 12 Months Ended
Apr. 26, 2025
Apr. 27, 2026
Apr. 26, 2025
Apr. 27, 2024
Apr. 29, 2023
May 11, 2023
Segment Reporting Information [Line Items]            
Contract with customer assets $ 41,169,000   $ 41,169,000 $ 55,800,000    
Gross profit     195,487,000 222,443,000 $ 151,355,000  
Equity method investments 0   0 1,813,000    
Income (loss) from equity method investments     (3,053,000) (3,764,000) (3,332,000)  
Impairment 4,576,000   4,576,000 4,576,000    
Equity investees impairment     0 6,359,000 4,473,000  
Accounts payable 75,000   75,000 146,000    
Amount invested     4,565,000 5,050,000 4,315,000  
Purchase of convertible notes 19,843,000   19,843,000 14,241,000    
Financing receivable, credit loss, expense (reversal)     15,480,000 0 0  
Investment in affiliates loss, amount       0    
Convertible note and investment in affiliates, amount     3,123,000 16,054,000    
Cash and cash equivalents 127,507,000   127,507,000 81,299,000 23,982,000  
Capitalized contract cost, net 321,000   321,000 $ 384,000    
Self insured, individual retention $ 250,000   $ 250,000      
Common stock, par value (in dollar per share) $ 0.00001   $ 0.00001 $ 0.00001    
Antidilutive securities excluded from computation of earnings per share, amount (in shares) 2,218,000          
Forecast            
Segment Reporting Information [Line Items]            
Convertible note and investment in affiliates, amount   $ 400,000        
Geographic Distribution, Foreign            
Segment Reporting Information [Line Items]            
Cash and cash equivalents $ 14,749,000   $ 14,749,000      
Subsidiaries | Geographic Distribution, Foreign            
Segment Reporting Information [Line Items]            
Cash and cash equivalents 12,309,000   12,309,000      
Variable Interest Entity, Primary Beneficiary            
Segment Reporting Information [Line Items]            
Contract with customer assets 0   0 $ 1,955,000    
Contract with customer, liability 41,000   41,000 38,000    
Gross profit     89,000 2,761,000    
United States of America, Dollars            
Segment Reporting Information [Line Items]            
Cash and cash equivalents 112,758,000   112,758,000      
United States of America, Dollars | Subsidiaries            
Segment Reporting Information [Line Items]            
Cash and cash equivalents $ 932,000   932,000      
Product Design And Development            
Segment Reporting Information [Line Items]            
Related party transaction, amounts of transaction     $ 771,000 577,000 672,000  
Miortech            
Segment Reporting Information [Line Items]            
Equity method investment, ownership percentage 55.90%   55.90%      
Impairment         $ 4,473,000  
XdisplayTM            
Segment Reporting Information [Line Items]            
Equity method investment, ownership percentage 16.40%   16.40%      
Convertible note            
Segment Reporting Information [Line Items]            
Amount invested     $ 4,565,000 5,050,000    
Interest payable $ 838,000   $ 838,000 $ 449,000    
Antidilutive securities excluded from computation of earnings per share, amount (in shares)       3,915,000    
Debt instrument, face amount       $ 25,000,000   $ 25,000,000
Stock options            
Segment Reporting Information [Line Items]            
Antidilutive securities excluded from computation of earnings per share, amount (in shares)     49,000 675,000 2,084,000  
Antidilutive securities excluded from computation of earnings per share, weighted average exercise price (in dollars per share)     $ 10.57 $ 10.29 $ 7.47  
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