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Share Capital - Additional Information (Details)
 3 Months Ended 12 Months Ended
Nov. 02, 2017
CAD ($)
shares
$ / shares
Oct. 20, 2017
shares
Oct. 01, 2017
shares
Jul. 04, 2017
shares
Apr. 03, 2017
shares
Jan. 31, 2017
CAD ($)
shares
Mar. 31, 2018
CAD ($)
shares
Mar. 31, 2018
CAD ($)
shares
$ / shares
Mar. 31, 2017
CAD ($)
shares
$ / shares
Feb. 07, 2018
shares
Sep. 07, 2017
shares
Dec. 12, 2016
shares
Apr. 07, 2016
CAD ($)
shares
Mar. 31, 2016
CAD ($)
shares
Disclosure Of Classes Of Share Capital [Line Items]                            
common shares issued | shares                     111,366 490,641    
Transaction costs               $ 10,008,000 $ 8,066,000          
Shares issued | shares             199,320,981 199,320,981 162,187,262 117,253       98,818,213
Warrants exercised | shares               207,297 213,104          
Warrants exercise price | $ / shares               $ 3.72 $ 0.59          
Weighted average exercise price of options outstanding             $ 12.95 $ 12.95            
Exercise price of share options exercisable             $ 4.55 4.55            
Share-based compensation expense               $ 4,774,000            
Number of options provided in exchange for services | shares               420,000            
Proceeds from exercise of stock options               $ 11,053,000 $ 6,961,000          
Share-based compensation               47,597,000 10,043,000          
Share based payments               1,151,000 1,307,000          
Common shares issue for payment of royalties | shares   79,717                        
Expense               3,110,000 1,416,000          
Cost of Sale                            
Disclosure Of Classes Of Share Capital [Line Items]                            
Expense               920,000 0          
Canopy Rivers                            
Disclosure Of Classes Of Share Capital [Line Items]                            
Share-based compensation expense               3,579,000 0          
Options                            
Disclosure Of Classes Of Share Capital [Line Items]                            
Share-based compensation expense               $ 21,278,000 $ 7,650,000          
Maximum                            
Disclosure Of Classes Of Share Capital [Line Items]                            
Percentage of number of shares issuable from treasury pursuant to awards               10.00%            
Number of common shares reserved for Awards | shares             19,955,721 19,955,721            
Omnibus Incentive Plan                            
Disclosure Of Classes Of Share Capital [Line Items]                            
Aggregate number of common shares that may be issued | shares                 400,000          
Aggregate number of common shares that may be issued | shares                 200,000          
Purchase Plan                            
Disclosure Of Classes Of Share Capital [Line Items]                            
Shares issued | shares               0            
ESOP                            
Disclosure Of Classes Of Share Capital [Line Items]                            
Percentage of options exercisable on each anniversaries from date of grant               33.33%            
ESOP expiration period               6 years            
Weighted average exercise price of options outstanding             $ 12.95 $ 12.95 $ 3.97         $ 2.05
Options exercised | shares               3,912,946 4,010,865          
Proceeds from exercise of stock options               $ 11,053,000            
ESOP | Maximum                            
Disclosure Of Classes Of Share Capital [Line Items]                            
Exercise price, share options granted               11.71            
ESOP | Minimum                            
Disclosure Of Classes Of Share Capital [Line Items]                            
Exercise price, share options granted               $ 0.43            
XIB Consulting Inc | Corporate Development Initiatives                            
Disclosure Of Classes Of Share Capital [Line Items]                            
Shares issued | shares                         72,418  
MedCann Access                            
Disclosure Of Classes Of Share Capital [Line Items]                            
Shares released from escrow related to the acquisition, shares | shares               240,678 1,011,239          
Shares released and cancelled from escrow account | shares               48,078 1,149,892          
Share-based compensation               $ 14,000 $ (396,000)          
LBC Holdings, Inc                            
Disclosure Of Classes Of Share Capital [Line Items]                            
Shares released from escrow related to the acquisition, shares | shares     87,836 87,836 87,836       138,032          
Shares released from escrow | shares               25,097            
Mettrum                            
Disclosure Of Classes Of Share Capital [Line Items]                            
common shares issued | shares           34,265,042     83,822          
Total consideration           $ 350,334,000     $ 350,334,000          
Equity consideration           337,511,000                
Share-based compensation expense           $ 480,000                
Mettrum | Common Shares                            
Disclosure Of Classes Of Share Capital [Line Items]                            
Equity consideration                 $ 1,000,000          
Mettrum | XIB Consulting Inc | Corporate Development Initiatives | Common Shares                            
Disclosure Of Classes Of Share Capital [Line Items]                            
common shares issued | shares                         83,822  
Equity consideration                         $ 1,000,000  
Greenstar investment                            
Disclosure Of Classes Of Share Capital [Line Items]                            
common shares issued | shares 18,876,901                          
Total consideration $ 244,990,000                          
offering price | $ / shares $ 12.9783                          
Purchase price of shares $ 174,472,000                          
Purchase price of warrants 70,518,000                          
Warrants expiration description             The warrants, each exercisable at $12.9783 per warrant for a common share expire May 2, 2020 and are exercisable in two equal tranches, with the first exercisable tranche date being August 1, 2018, and the second exercisable tranche date being February 1, 2019, provided at the time of exercising the warrants, the Company still owns the 18,876,901 common shares.              
Transaction costs $ 707,000                          
Warrants | Greenstar investment                            
Disclosure Of Classes Of Share Capital [Line Items]                            
common shares issued | shares 18,876,901                          
Transaction costs $ 253,000