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Fair value of financial instruments - Derivative Liability Assumptions (Details)
Feb. 23, 2025
May 26, 2024
Probability of change in control event    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative liability, measurement input 0.80 0.80
Weighted average discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative liability, measurement input 0.180 0.214