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Supplemental Cash Flow Information - Supplementary Cash Flow Information (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Statement of cash flows, additional disclosures [Abstract]    
Property, plant and equipment in accounts payable $ 7,867 $ 41,646
Right-of-use-asset additions 9,386 0
Capitalized borrowing costs 21,961 25,244
Interest paid 47,904 18,055
Interest received $ 2,516 $ 4,970