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SUMMARY OF VALUATION USING BLACK-SCHOLES PRICING METHOD (Details)
6 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Property, Plant and Equipment [Line Items]    
Warrants and Rights Outstanding, Term 5 years  
Valuation Technique, Option Pricing Model [Member] | Measurement Input, Expected Term [Member] | Warrant [Member]    
Property, Plant and Equipment [Line Items]    
Warrants and Rights Outstanding, Term   10 years
Valuation Technique, Option Pricing Model [Member] | Measurement Input, Expected Term [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
[custom:DerivativeLiabilitiesMeasurementInputTerm] 1 year 8 months 12 days  
Valuation Technique, Option Pricing Model [Member] | Measurement Input, Expected Term [Member] | Minimum [Member] | Warrant [Member]    
Property, Plant and Equipment [Line Items]    
Warrants and Rights Outstanding, Term 5 years  
Valuation Technique, Option Pricing Model [Member] | Measurement Input, Expected Term [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
[custom:DerivativeLiabilitiesMeasurementInputTerm] 5 years  
Valuation Technique, Option Pricing Model [Member] | Measurement Input, Expected Term [Member] | Maximum [Member] | Warrant [Member]    
Property, Plant and Equipment [Line Items]    
Warrants and Rights Outstanding, Term 10 years  
Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Derivative Liability, Measurement Input 50  
Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] | Minimum [Member] | Warrant [Member]    
Property, Plant and Equipment [Line Items]    
Warrants and Rights Outstanding, Measurement Input 50 148
Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Derivative Liability, Measurement Input 155  
Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] | Maximum [Member] | Warrant [Member]    
Property, Plant and Equipment [Line Items]    
Warrants and Rights Outstanding, Measurement Input 157 152
Valuation Technique, Option Pricing Model [Member] | Measurement Input, Risk Free Interest Rate [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Derivative Liability, Measurement Input 0.0016  
Valuation Technique, Option Pricing Model [Member] | Measurement Input, Risk Free Interest Rate [Member] | Minimum [Member] | Warrant [Member]    
Property, Plant and Equipment [Line Items]    
Warrants and Rights Outstanding, Measurement Input 0.90 0.68
Valuation Technique, Option Pricing Model [Member] | Measurement Input, Risk Free Interest Rate [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Derivative Liability, Measurement Input 1.21  
Valuation Technique, Option Pricing Model [Member] | Measurement Input, Risk Free Interest Rate [Member] | Maximum [Member] | Warrant [Member]    
Property, Plant and Equipment [Line Items]    
Warrants and Rights Outstanding, Measurement Input 1.63 0.85
Valuation Technique, Option Pricing Model [Member] | Measurement Input, Expected Dividend Rate [Member]    
Property, Plant and Equipment [Line Items]    
Derivative Liability, Measurement Input 0  
Valuation Technique, Option Pricing Model [Member] | Measurement Input, Expected Dividend Rate [Member] | Warrant [Member]    
Property, Plant and Equipment [Line Items]    
Warrants and Rights Outstanding, Measurement Input 0 0