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Interest in equity investees - Reconciliation to Carrying Amount (Details) - CAD ($)
$ in Thousands
12 Months Ended
May 31, 2019
May 31, 2018
Interest in equity investees    
Opening balance $ 4,966  
Closing balance 9,311 $ 4,966
Althea    
Interest in equity investees    
Opening balance 4,966  
Transfer from long-term investments   2,483
Cash contributions, net of share issuance costs 3,258 2,497
Total gain on dilution of ownership in equity investee 2,210  
Share of reported net loss (1,123) (14)
Closing balance $ 9,311 $ 4,966