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Business Segment Reporting - Sales by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
May 31, 2020
Feb. 23, 2020
Nov. 24, 2019
Aug. 25, 2019
May 26, 2019
Feb. 24, 2019
Nov. 25, 2018
Aug. 26, 2018
May 31, 2020
May 26, 2019
May 27, 2018
Segment Reporting Information [Line Items]                      
Revenues $ 156,131 $ 152,928 $ 142,593 $ 138,714 $ 152,780 $ 155,554 $ 124,557 $ 124,668 $ 590,366 $ 557,559 $ 524,227
Canada                      
Segment Reporting Information [Line Items]                      
Revenues                 76,400 83,600 78,000
Belgium                      
Segment Reporting Information [Line Items]                      
Revenues                 13,800 15,100 17,200
Ireland                      
Segment Reporting Information [Line Items]                      
Revenues                 4,000 5,000 4,100
All Other Countries                      
Segment Reporting Information [Line Items]                      
Revenues                 $ 7,800 $ 5,100 $ 3,600