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Significant Accounting Policies and Disclosures - Additional Information (Details)
 12 Months Ended
May 27, 2023
USD ($)
Number
$ / shares
shares
May 28, 2022
USD ($)
$ / shares
shares
May 29, 2021
USD ($)
$ / shares
shares
Significant Accounting Policies and Disclosures [Line Items]      
Allowance for doubtful accounts $ 191,000 $ 186,000  
Foreign exchange (gain) loss 278,000 273,000 $ 759,000
Finished goods 93,400,000 66,600,000  
Raw material 11,800,000 8,000,000.0  
Work in progress 5,200,000 5,800,000  
Inventory valuation reserves 5,900,000 6,100,000  
Inventory provisions 466,000 462,000 1,041,000
Investments - current 0 5,000,000  
Depreciation 3,400,000 3,200,000 3,200,000
Construction in progress 4,437,000 1,991,000  
Other non-current liabilities 612,000 766,000  
Share-based compensation expense $ 936,000 $ 654,000 $ 675,000
Stock option vesting period 5 years    
Option terms to exercise 10 years    
Exercised | shares 440,480,000    
Proceeds from share exercised $ 3,800,000    
Weighted average fair value of stock option grants | $ / shares $ 5.44 $ 1.5 $ 0.49
Total unrecognized compensation costs $ 1,800,000    
Total grant date fair value stock options vested $ 300,000    
Limit of cash dividends Class B common stock (percent) 90.00%    
Common stock options anti-dilutive | shares 0 0 0
Common Stock      
Significant Accounting Policies and Disclosures [Line Items]      
Common stock shares, authorized | shares 17,000,000    
Common Class B      
Significant Accounting Policies and Disclosures [Line Items]      
Common stock shares, authorized | shares 3,000,000    
Number of votes per share | Number 10    
Employees' 2011 Long-Term Incentive Compensation Plan      
Significant Accounting Policies and Disclosures [Line Items]      
Number of shares authorized | shares 3,500,000    
Number of shares for future issuance | shares 1,028,000    
Option exercisable period 5 years    
Facilities      
Significant Accounting Policies and Disclosures [Line Items]      
Construction in progress $ 2,200,000    
Manufacturing Facilities      
Significant Accounting Policies and Disclosures [Line Items]      
Construction in progress 1,600,000    
IT systems      
Significant Accounting Policies and Disclosures [Line Items]      
Construction in progress $ 600,000    
Maximum      
Significant Accounting Policies and Disclosures [Line Items]      
Services revenue recognized as percentage of aggregate revenue 5.00%    
Intrinsic value $ 4,700,000 $ 1,900,000 $ 100,000
Period of recognition 4 years    
Maximum | Employees' 2011 Long-Term Incentive Compensation Plan      
Significant Accounting Policies and Disclosures [Line Items]      
Option terms to exercise 10 years    
Minimum      
Significant Accounting Policies and Disclosures [Line Items]      
Period of recognition 2 years