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Derivative Liabilities - Fair value assumptions, derivative warrant liability (Details) - $ / shares
9 Months Ended
Aug. 02, 2015
Apr. 30, 2016
Jul. 31, 2015
Notes to Financial Statements      
Current exercise price   $ 0.015 $ 0.015
Time to expiration 2 years 6 months 2 years 4 months  
Risk-free interest rate 1.08% 92.00%  
Estimated volatility 82.00% 101.00%  
Dividend 0.00% 0.00%  
Stock price at period end date   $ .006 $ 0.01