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Formation of Canopy Rivers - Additional Information (Details)
 12 Months Ended
Jan. 08, 2018
CAD ($)
shares
May 12, 2017
CAD ($)
shares
Mar. 31, 2018
CAD ($)
shares
$ / shares
Mar. 31, 2017
CAD ($)
Sep. 07, 2017
shares
Dec. 12, 2016
shares
Disclosure Of Significant Investments In Subsidiaries [Line Items]            
Number of shares provided in exchange for service | shares   668        
Equity financing issue costs net of tax   $ 1,709,000        
Net assets acquired recorded as equity attributable to the parent     $ 1,158,773,000 $ 639,758,000    
common shares issued | shares         111,366 490,641
Transaction costs     10,008,000 $ 8,066,000    
Increase (decrease) in equity $ 1,047,000          
Canopy Rivers Corporation            
Disclosure Of Significant Investments In Subsidiaries [Line Items]            
Advanced convertible debenture for formation of subsidiary   $ 20,000,000        
Proportion of ownership interest in subsidiary 31.50% 34.10%        
Voting rights, percentage 89.10% 91.20%        
Net assets acquired recorded as equity attributable to the parent   $ 1,065,000 $ (35,550,000)      
Percentage of option granted to acquire subsidiary     8.70%      
Description of vesting term of option granted     vest in 3 equal tranches over 3 years      
Share-based compensation expense     $ 3,090,000      
Description of options exercisable term     exercisable in increments, with one third being exercisable on each of the first, second and third anniversaries from the date of grant.      
Description of expiry date of option     December 4, 2022 to March 26, 2023      
Share-based compensation expense with non-employees     $ 489,000      
Investments by Canopy Growth $ 5,141,000          
Class B Common Shares | Canopy Rivers Corporation            
Disclosure Of Significant Investments In Subsidiaries [Line Items]            
Seed capital advanced   $ 953,000        
Number of shares to be purchased with seed capital advanced | shares   19,066,667        
Proceeds from issuing shares $ 26,000,000 $ 36,899,000        
Options granted, per share | $ / shares     $ 0.05      
Exercise price, share options granted     $ 0.60      
common shares issued | shares 23,636,365          
Transaction costs $ 738,000          
Class B Common Shares | Employees And Other Individual | Canopy Rivers Corporation            
Disclosure Of Significant Investments In Subsidiaries [Line Items]            
Seed capital advanced by employees   503,000        
Class B Common Shares | Employees | Canopy Rivers Corporation            
Disclosure Of Significant Investments In Subsidiaries [Line Items]            
Number of option granted | shares     3,475,000      
Class B Common Shares | Consultants | Canopy Rivers Corporation            
Disclosure Of Significant Investments In Subsidiaries [Line Items]            
Number of option granted | shares     2,440,000      
Class A Common Shares | Canopy Rivers Corporation            
Disclosure Of Significant Investments In Subsidiaries [Line Items]            
Debenture interest converted to shares   $ 57,000