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Financial Instruments - Summary Contractual Maturities of Undiscounted Cash Flows (Details)
$ in Thousands
Mar. 31, 2018
CAD ($)
Carrying Amount  
Disclosure Of Maturity Analysis For Nonderivative Financial Liabilities [Line Items]  
Accounts payable and accrued liabilities $ 89,571
Long-term debt 8,422
Total 97,993
Contractual Cash Flow  
Disclosure Of Maturity Analysis For Nonderivative Financial Liabilities [Line Items]  
Accounts payable and accrued liabilities 89,571
Long-term debt 9,522
Total 99,093
Year 1  
Disclosure Of Maturity Analysis For Nonderivative Financial Liabilities [Line Items]  
Accounts payable and accrued liabilities 89,571
Long-term debt 1,899
Total 91,470
Years 2 - 3  
Disclosure Of Maturity Analysis For Nonderivative Financial Liabilities [Line Items]  
Long-term debt 5,082
Total 5,082
Years 4 and After - 5  
Disclosure Of Maturity Analysis For Nonderivative Financial Liabilities [Line Items]  
Long-term debt 2,541
Total $ 2,541