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Business Segment Reporting - Sales by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended
Aug. 25, 2019
Aug. 26, 2018
Segment Reporting Information [Line Items]    
Net sales $ 138,714 $ 124,668
Canada    
Segment Reporting Information [Line Items]    
Net sales 20,700 19,900
Belgium    
Segment Reporting Information [Line Items]    
Net sales 0 2,000
Ireland    
Segment Reporting Information [Line Items]    
Net sales 1,400 1,100
All Other Countries    
Segment Reporting Information [Line Items]    
Net sales $ 1,700 $ 800