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Disclosure of number and weighted average remaining contractual life of outstanding share options (Details)
Feb. 28, 2019
CAD ($)
Share
Year
Aug. 31, 2018
Share
Aug. 31, 2017
Share
Statements [Line Items]      
Number of share options outstanding in share-based payment arrangement 262,250 308,550 438,228
Number of share options exercisable in share-based payment arrangement 262,250    
Weighted average remaining contractual life of outstanding share options | Year 2.19    
Options outstanding 1 [Member]      
Statements [Line Items]      
Number of share options outstanding in share-based payment arrangement 202,450    
Number of share options exercisable in share-based payment arrangement 202,450    
Exercise price of outstanding share options | $ $ 20.00    
Weighted average remaining contractual life of outstanding share options | Year 2.55    
Options outstanding 2 [Member]      
Statements [Line Items]      
Number of share options outstanding in share-based payment arrangement 59,800    
Number of share options exercisable in share-based payment arrangement 59,800    
Exercise price of outstanding share options | $ $ 65.00    
Weighted average remaining contractual life of outstanding share options | Year 0.97