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Financial Instruments Risk - Credit Risk (Details) - CAD ($)
$ in Thousands
Jun. 30, 2020
Jun. 30, 2019
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Trade receivables $ 45,199 $ 83,877
Credit risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Trade receivables 45,199 83,877
Credit risk | 0 – 60 days    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Trade receivables 34,167 49,452
Credit risk | 61 plus days    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Trade receivables $ 11,032 $ 34,425