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Long-term Debt and Other Long-Term Liabilities - Summary of Principal Repayments of Long-term Debt (Parenthetical) (Details) - CAD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Disclosure Of Detailed Information About Borrowings [Line Items]    
Other long-term liabilities $ 61,150 $ 766
BC Tweed    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Put liability 56,300  
Vert Mirabel    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Put liability $ 4,850