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SUMMARY OF VALUATION USING BLACK-SCHOLES PRICING METHOD (Details) | 6 Months Ended |
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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

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