v3.26.1
Share-based payments - Assumptions used to determine the fair value of option grants (Details)
9 Months Ended
May 31, 2026
Y
$ / shares
November 30, 2022  
Share-based payments  
Exercise price $ 2,435,400
Market Price $ 2,435,400
Expected volatility 107.00%
Risk-free interest rate 3.10%
Expected life | Y 5
December 1, 2022  
Share-based payments  
Exercise price $ 2,349,000
Market Price $ 2,349,000
Expected volatility 107.00%
Risk-free interest rate 3.00%
Expected life | Y 5
March 22, 2023  
Share-based payments  
Exercise price $ 2,273,400
Market Price $ 2,022,300
Expected volatility 75.00%
Risk-free interest rate 3.60%
Expected life | Y 2
March 25, 2023  
Share-based payments  
Exercise price $ 2,273,400
Market Price $ 2,057,400
Expected volatility 75.00%
Risk-free interest rate 3.60%
Expected life | Y 3
March 25, 2023  
Share-based payments  
Exercise price $ 2,273,400
Market Price $ 2,057,400
Expected volatility 75.00%
Risk-free interest rate 3.60%
Expected life | Y 4
April 20, 2023  
Share-based payments  
Exercise price $ 2,332,800
Market Price $ 2,122,200
Expected volatility 75.00%
Risk-free interest rate 3.60%
Expected life | Y 5
December 29, 2023  
Share-based payments  
Exercise price $ 1,852,200
Market Price $ 604,800
Expected volatility 76.00%
Risk-free interest rate 3.10%
Expected life | Y 5
January 26, 2024  
Share-based payments  
Exercise price $ 410,400
Market Price $ 430,920
Expected volatility 76.00%
Risk-free interest rate 3.50%
Expected life | Y 5
July 25, 2025  
Share-based payments  
Exercise price $ 2,644
Market Price $ 2,640
Expected volatility 101.00%
Risk-free interest rate 2.80%
Expected life | Y 5