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Stock-based compensation - Stock Options Activity (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
May 25, 2025
USD ($)
$ / shares
shares
Shares  
Options outstanding, beginning balance (in shares) | shares 2,112,591
Granted (in shares) | shares 755,775
Forfeited (in shares) | shares (155,189)
Expired (in shares) | shares (1,452,878)
Options outstanding, ending balance (in shares) | shares 1,260,299
Options exercisable (in shares) | shares 599,970
Weighted-average exercise price per share  
Options outstanding, beginning balance (in dollars per share) | $ / shares $ 10.88
Granted (in dollars per share) | $ / shares 6.64
Forfeited (in dollars per share) | $ / shares 7.49
Expired (in dollars per share) | $ / shares 11.04
Options outstanding, ending balance (in dollars per share) | $ / shares 8.57
Options exercisable (in dollars per share) | $ / shares $ 10.57
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Weighted average remaining contractual term, options outstanding 4 years 6 months
Weighted average remaining contractual term, options exercisable 2 years 3 months 18 days
Aggregate intrinsic value, options outstanding | $ $ 225,294
Aggregate intrinsic value, options exercisable | $ $ 1,361