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Financial instruments - Contractually obligated cash flow requirements (Details)
Aug. 31, 2019
USD ($)
Total $ 4,512,000
Within 1 Year 4,512,000
1 - 2 Years 0
2 - 5 Years 0
Thereafter 0
Accounts payable and accrued liabilities [Member]  
Total 4,512,000
Within 1 Year 4,512,000
1 - 2 Years 0
2 - 5 Years 0
Thereafter $ 0