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Business Segment Reporting - Sales by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 24, 2019
Feb. 25, 2018
Feb. 24, 2019
Feb. 25, 2018
Segment Reporting Information [Line Items]        
Segment sales $ 155,687 $ 144,909 $ 405,267 $ 383,151
Canada        
Segment Reporting Information [Line Items]        
Segment sales 24,100 20,300 64,300 55,900
Belgium        
Segment Reporting Information [Line Items]        
Segment sales 9,900 11,500 12,400 14,300
Ireland        
Segment Reporting Information [Line Items]        
Segment sales 1,400 0 3,700 3,200
Denmark        
Segment Reporting Information [Line Items]        
Segment sales 100 0 300 0
Switzerland        
Segment Reporting Information [Line Items]        
Segment sales 200 0 800 0
Mexico        
Segment Reporting Information [Line Items]        
Segment sales 400 200 500 200
All Other Countries        
Segment Reporting Information [Line Items]        
Segment sales $ 100 $ 1,500 $ 1,300 $ 2,000