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Business Segment Reporting - Sales by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 28, 2021
Feb. 23, 2020
Feb. 28, 2021
Feb. 23, 2020
Segment Reporting Information [Line Items]        
Product sales $ 137,782 $ 152,928 $ 404,328 $ 434,235
Canada        
Segment Reporting Information [Line Items]        
Product sales 14,800 19,600 45,600 58,800
Belgium        
Segment Reporting Information [Line Items]        
Product sales 6,000 9,300 12,600 12,400
Czech Republic        
Segment Reporting Information [Line Items]        
Product sales 800 2,100 2,500 2,100
Switzerland        
Segment Reporting Information [Line Items]        
Product sales 1,600 300 2,400 1,600
United Kingdom        
Segment Reporting Information [Line Items]        
Product sales 1,200 200 2,400 700
Ireland        
Segment Reporting Information [Line Items]        
Product sales 300 0 1,500 1,900
All Other Countries        
Segment Reporting Information [Line Items]        
Product sales $ 1,800 $ 100 $ 2,700 $ 1,000