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Stock-based compensation - Stock Options Activity (Details)
$ / shares in Units, $ in Thousands
 9 Months Ended
Feb. 23, 2025
USD ($)
$ / shares
shares
Shares  
Options outstanding, beginning balance (in shares) | shares 2,112,591
Granted (in shares) | shares 545,775
Forfeited (in shares) | shares (75,676)
Expired (in shares) | shares (1,164,335)
Options outstanding, ending balance (in shares) | shares 1,418,355
Options exercisable (in shares) | shares 864,223
Weighted-average exercise price per share  
Options outstanding, beginning balance (in dollars per share) | $ / shares $ 10.88
Granted (in dollars per share) | $ / shares 6.83
Forfeited (in dollars per share) | $ / shares 7.38
Expired (in dollars per share) | $ / shares 11.06
Options outstanding, ending balance (in dollars per share) | $ / shares 9.35
Options exercisable (in dollars per share) | $ / shares $ 10.70
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Weighted average remaining contractual term, options outstanding 3 years 10 months 24 days
Weighted average remaining contractual term, options exercisable 2 years 2 months 12 days
Aggregate intrinsic value, options outstanding | $ $ 45
Aggregate intrinsic value, options exercisable | $ $ 0