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Business Segment Reporting - Sales by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 27, 2022
Feb. 28, 2021
Feb. 27, 2022
Feb. 28, 2021
Segment Reporting Information [Line Items]        
Product sales $ 53,074 $ 44,690 $ 138,158 $ 126,629
Switzerland        
Segment Reporting Information [Line Items]        
Product sales 8,200 1,600 13,600 2,400
Canada        
Segment Reporting Information [Line Items]        
Product sales 3,000 2,700 9,500 8,300
Belgium        
Segment Reporting Information [Line Items]        
Product sales 0 6,000 0 12,600
All Other Countries        
Segment Reporting Information [Line Items]        
Product sales $ 3,700 $ 3,900 $ 3,200 $ 3,200