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Business Segment Reporting - Sales by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended
Aug. 28, 2022
Aug. 29, 2021
Segment Reporting Information [Line Items]    
Product sales $ 43,355 $ 41,632
Switzerland    
Segment Reporting Information [Line Items]    
Product sales 4,000 3,400
Canada    
Segment Reporting Information [Line Items]    
Product sales 3,700 3,500
All Other Countries    
Segment Reporting Information [Line Items]    
Product sales $ 1,900 $ 1,700