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Prepaid Expenses and Other Assets - Schedule of Prepaid Expenses and Other Assets (Details) - CAD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Prepaid Expenses And Other Assets [Line Items]    
Restricted short-term investments $ 664 $ 550
Other assets 2,199 801
Prepaid expenses and other assets 19,837 4,285
Prepaid Packaging    
Prepaid Expenses And Other Assets [Line Items]    
Prepaid expenses 8,774  
Prepaid Expenses    
Prepaid Expenses And Other Assets [Line Items]    
Prepaid expenses 7,358 $ 2,934
Prepaid Deposits    
Prepaid Expenses And Other Assets [Line Items]    
Prepaid expenses $ 842