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Income Taxes - Reconciliation of Net Tax Provision to Income (Loss) Before Income Tax (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Disclosure of analysis of single amount of discontinued operations [line items]    
Loss from continuing operations before tax $ (3,383,896) $ (330,649)
Combined federal and provincial rate 27.00% 27.00%
Expected tax recovery from continuing operations $ (913,652) $ (89,275)
Expected tax recovery from continuing operations (115) 2,984
Foreign exchange (373) 0
Non-deductible expenses 20,081 34,552
Non-deducible (non-taxable) portion of capital items 20,839 (11,344)
Non-deducible loss on conversion of debt 46,598 0
Goodwill and other impairment items 659,980 0
Tax impact on divestitures (5,170) 0
Difference in statutory tax rate 17,414 (665)
Effect of change in tax rates 711 3,793
Changes in deferred tax benefits not recognized 70,284 30,046
Income tax recovery from continuing operations (83,403) (29,909)
Tax expense (income) relating to gain (loss) on discontinuance 500 (1,300)
Discontinued operations    
Disclosure of analysis of single amount of discontinued operations [line items]    
Tax recovery from sale of discontinued operations $ 0 $ 0