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Income Taxes - Summary of Income Tax Expense (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Major Components Of Tax Expense Income [Abstract]    
Loss from operations $ (52,541) $ (10,275)
Expected tax rate 26.50% 26.50%
Expected tax benefit resulting from loss $ 13,923 $ 2,723
Non-deductible expenses (19,310) (2,156)
Increase in unrecognized temporary differences (5,506) 2,258
Non-taxable portion of capital gains and losses 9,421  
Other (121) (122)
Income tax (expense) recovery $ (1,593) $ 2,703