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Financial instruments - Contractually obligated cash flow requirements (Details) - USD ($)
Feb. 29, 2020
Aug. 31, 2019
Total $ 1,274,000  
Within 1 Year 1,274,000  
1 - 2 Years 0  
2 - 5 Years 0  
Thereafter   $ 0
Accounts payable and accrued liabilities [Member]    
Total 1,274,000  
Within 1 Year 1,274,000  
1 - 2 Years 0  
2 - 5 Years 0  
Thereafter $ 0