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Revenue recognition - Disaggregation of Revenue by Product Line (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 23, 2025
Feb. 25, 2024
Feb. 23, 2025
Feb. 25, 2024
Segment Reporting Information [Line Items]        
Revenues $ 35,154 $ 35,704 $ 92,423 $ 90,375
CDMO        
Segment Reporting Information [Line Items]        
Revenues 20,789 22,306 66,579 67,522
HA manufacturing        
Segment Reporting Information [Line Items]        
Revenues $ 14,365 $ 13,398 $ 25,844 $ 22,853