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Segmented Information - Narrative (Details) - CAD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Disclosure of geographical areas [line items]    
Revenue $ 278,906 $ 245,536
Canada    
Disclosure of geographical areas [line items]    
Revenue 255,278 230,279
Customer A | Canada    
Disclosure of geographical areas [line items]    
Revenue 34,800 26,700
Customer B | Canada    
Disclosure of geographical areas [line items]    
Revenue 33,800 31,900
Customer C | Canada    
Disclosure of geographical areas [line items]    
Revenue 32,600  
Customer D | Canada    
Disclosure of geographical areas [line items]    
Revenue $ 26,900 $ 29,100