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Intangible Assets And Goodwill - Additional Information (Details) - CAD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Feb. 07, 2018
Sep. 07, 2017
Mar. 31, 2018
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Disclosure Of Intangible Assets [Line Items]            
Impairment loss     $ 28,000      
Number of common shares issued 117,253   199,320,981 199,320,981 162,187,262 98,818,213
Common shares issued value $ 3,239 $ 1,003        
Acquisition-related costs expensed 43     $ 3,406 $ 7,369  
Property, plant and equipment     $ 303,682 303,682 96,270 $ 44,984
Intangible assets     $ 101,526 101,526 $ 162,263 $ 31,861
Shares received value 1,127          
Health Canada Licenses            
Disclosure Of Intangible Assets [Line Items]            
Net derecognition of intangible assets       $ 26,282    
Tangible And Intangible Asset Acquisition            
Disclosure Of Intangible Assets [Line Items]            
Property, plant and equipment 50          
Intangible assets $ 3,232