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Inventory - Additional Information (Details) - CAD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2018
Mar. 31, 2017
Classes Of Inventories [Abstract]      
Inventories expensed during the period   $ 92,683 $ 39,210
Fair value changes in biological assets included in inventory sold and other inventory charges   66,268 $ 34,978
Fair value changes in biological assets included in inventory sold   40,509  
Other inventory charges included in the fair value changes in biological assets included in inventory sold and other inventory charges   25,759  
Net realizable value adjustment for anticipated price changes   $ 8,431  
Inventory write-off $ 7,903