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Business Segment Reporting - Sales by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
May 30, 2021
Feb. 28, 2021
Nov. 29, 2020
Aug. 30, 2020
May 31, 2020
Feb. 23, 2020
Nov. 24, 2019
Aug. 25, 2019
May 30, 2021
May 31, 2020
May 26, 2019
Segment Reporting Information [Line Items]                      
Revenues $ 139,832 $ 137,782 $ 130,904 $ 135,643 $ 156,131 $ 152,928 $ 142,593 $ 138,714 $ 544,161 $ 590,366 $ 557,559
Canada                      
Segment Reporting Information [Line Items]                      
Revenues                 60,900 76,400 83,600
Belgium                      
Segment Reporting Information [Line Items]                      
Revenues                 13,700 13,800 15,100
Switzerland                      
Segment Reporting Information [Line Items]                      
Revenues                 4,700 1,700 1,200
Czech Republic                      
Segment Reporting Information [Line Items]                      
Revenues                 3,500 1,400 0
Ireland                      
Segment Reporting Information [Line Items]                      
Revenues                 2,000 4,000 5,000
All Other Countries                      
Segment Reporting Information [Line Items]                      
Revenues                 $ 5,100 $ 4,700 $ 3,900