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Business Segment Reporting - Sales by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Nov. 28, 2021
Nov. 29, 2020
Nov. 28, 2021
Nov. 29, 2020
Segment Reporting Information [Line Items]        
Product sales $ 129,492 $ 130,904 $ 258,280 $ 266,547
Canada        
Segment Reporting Information [Line Items]        
Product sales 12,400 13,700 27,300 30,200
Switzerland        
Segment Reporting Information [Line Items]        
Product sales 2,000 700 5,400 800
Czech Republic        
Segment Reporting Information [Line Items]        
Product sales 800 1,200 1,700 1,700
Ireland        
Segment Reporting Information [Line Items]        
Product sales 700 400 800 1,200
Belgium        
Segment Reporting Information [Line Items]        
Product sales 0 2,800 0 6,700
All Other Countries        
Segment Reporting Information [Line Items]        
Product sales $ 3,600 $ 900 $ 5,200 $ 2,000