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Cash and Cash Equivalents and Short-term investments (Narrative) (Details)
12 Months Ended
Apr. 30, 2024
CAD ($)
Apr. 30, 2023
CAD ($)
Apr. 30, 2024
MXN ($)
Apr. 30, 2024
USD ($)
Apr. 30, 2023
MXN ($)
Apr. 30, 2023
USD ($)
Disclosure Of Cash And Cash Equivalents And Short Term Investments [Line Items]            
Operating bank accounts $ 37,548,304 $ 12,608,704        
Current investments 30,000,000 $ 6,789,000       $ 5,000,000
Percentage of interest on GIC investment certificate   5.30%        
Short-term guaranteed investment $ 0 $ 40,115,000        
Other cash and cash equivalents     $ 441,705 $ 2,226,985 $ 6,877,311 $ 7,797,176
Bottom of range [Member]            
Disclosure Of Cash And Cash Equivalents And Short Term Investments [Line Items]            
Percentage of interest on GIC investment certificate 5.24%          
Percentage of interest on GIC investment certificate with maturities of more than 90 days   5.18%        
Top of range [Member]            
Disclosure Of Cash And Cash Equivalents And Short Term Investments [Line Items]            
Percentage of interest on GIC investment certificate 5.33%          
Percentage of interest on GIC investment certificate with maturities of more than 90 days   5.24%