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Business Segment Reporting - Sales by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended
Aug. 29, 2021
Aug. 30, 2020
Segment Reporting Information [Line Items]    
Product sales $ 128,788 $ 135,643
Canada    
Segment Reporting Information [Line Items]    
Product sales 15,600 16,500
SWITZERLAND    
Segment Reporting Information [Line Items]    
Product sales 3,400 100
Ireland    
Segment Reporting Information [Line Items]    
Product sales 200 800
Belgium    
Segment Reporting Information [Line Items]    
Product sales 0 3,900
All Other Countries    
Segment Reporting Information [Line Items]    
Product sales $ 1,800 $ 1,600