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Share Capital - Summary of Warrants (Details)
 12 Months Ended
Mar. 31, 2018
CAD ($)
shares
Disclosure Of Warrants [Line Items]  
Exercise of warrants | shares (207,297)
Number of whole warrants, Ending Balance | shares 18,912,012
Exercise of warrants $ 3.72
Average Exercise Price of Warrants, Ending Balance 12.96
Exercise of warrants (1,113,000)
Warrant value, Ending Balance $ 70,454,000
R Trees  
Disclosure Of Warrants [Line Items]  
rTrees acquisition | shares 242,408
rTrees acquisition $ 3.83
rTrees acquisition $ 1,302,000
Warrant expiration date April 30, 2018
Greenstar investment  
Disclosure Of Warrants [Line Items]  
Greenstar equity investment - net of warrant issue cost | shares 18,876,901
Greenstar equity investment - net of warrant issue cost $ 12.98
Greenstar equity investment - net of warrant issue cost $ 70,265,000
Warrant expiration date May 1, 2020