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Financial instruments and financial risk factors - Liabilities measured at fair value (Details) - Recurring fair value measurement - USD ($)
Oct. 31, 2022
Apr. 30, 2022
Oct. 31, 2021
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities   $ 11,469,108 $ 111,138,272
Convertible debt      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities $ 29,028,938 11,469,108  
Warrants      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities 82,109,334    
Quoted prices in active markets for identical assets (Level 1)      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities   0 53,549,989
Quoted prices in active markets for identical assets (Level 1) | Convertible debt      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities 0 0  
Quoted prices in active markets for identical assets (Level 1) | Warrants      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities 53,549,989    
Level 2      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities   11,469,108 $ 57,588,282
Level 2 | Convertible debt      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities 29,028,938 $ 11,469,108  
Level 2 | Warrants      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities $ 28,559,344