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Income Taxes - Deferred Tax Assets Not Recognized (Details) - CAD ($) $ in Thousands | Jun. 30, 2020 | Jun. 30, 2019
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets not recognized | $ 586,699 | $ 173,188
Non-capital losses carried forward |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets not recognized | 220,292 | 85,484
Investment in associates |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets not recognized | 33,629 | 87,704
Capital losses |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets not recognized | 131,295 | 0
Fixed assets |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets not recognized | 154,523 | 0
Intangible assets |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets not recognized | 3,668 | 0
Marketable Securities |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets not recognized | 23,792 | 0
Investment tax credits |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets not recognized | 5,034 | 0
Derivatives |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets not recognized | 2,860 | 0
Capital lease obligations |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets not recognized | 5,408 | 0
Other |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets not recognized | $ 6,198 | $ 0

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