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Disclosure of assumptions used in valuing stock options granted (Details)
12 Months Ended
Aug. 31, 2019
Year
Disclosure of terms and conditions of share-based payment arrangement [abstract]  
Risk-free interest rate 1.60%
Expected life of options 3.9
Annualized volatility 74.00%
Forfeiture rate 2.10%
Dividend rate 0.00%