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Fair Value Measurements (Tables)
 9 Months Ended
Jan. 31, 2022
Fair Value Disclosures [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

 

   January 31, 2022   January 31, 2021 
         
Dividend rate   N/A    0.0%
Risk-free rate   N/A - N/A    0.07% - 0.08% 
Expected life (years)   N/A    0.5 - 0.8 
Expected volatility   N/A    146.1%