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Amounts Receivable - Summary of Amounts Receivable (Details) - CAD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Trade And Other Receivables [Abstract]    
Accounts receivable $ 5,863 $ 2,794
Commodity tax receivable 15,262 2,769
Interest receivable 300 252
Total amounts receivable $ 21,425 $ 5,815