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Fair Value of Financial Instruments - Summary of Financial Instruments Measured at Fair Value (Details) - CAD ($) $ in Thousands | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
--- | --- | --- | ---
Disclosure Of Fair Value Measurements Of Assets And Liabilities [Line Items] |  |  |
Financial Assets | $ 2,783,695 | $ 5,499,241 |
Financial Liabilities | 657,245 | 1,111,867 |
Level 3 | Contingent consideration payable |  |  |
Disclosure Of Fair Value Measurements Of Assets And Liabilities [Line Items] |  |  |
Financial Liabilities | 19,604 | 28,137 | $ 21,333
At fair value | Contingent consideration payable |  |  |
Disclosure Of Fair Value Measurements Of Assets And Liabilities [Line Items] |  |  |
Financial Liabilities | 19,604 | 28,137 |
At fair value | Derivative liability |  |  |
Disclosure Of Fair Value Measurements Of Assets And Liabilities [Line Items] |  |  |
Financial Liabilities | 1,827 | 177,395 |
At fair value | Marketable securities |  |  |
Disclosure Of Fair Value Measurements Of Assets And Liabilities [Line Items] |  |  |
Financial Assets | 7,066 | 143,248 |
At fair value | Derivative assets |  |  |
Disclosure Of Fair Value Measurements Of Assets And Liabilities [Line Items] |  |  |
Financial Assets | 53,582 | 86,409 |
At fair value | Level 1 | Contingent consideration payable |  |  |
Disclosure Of Fair Value Measurements Of Assets And Liabilities [Line Items] |  |  |
Financial Liabilities | 0 | 0 |
At fair value | Level 1 | Derivative liability |  |  |
Disclosure Of Fair Value Measurements Of Assets And Liabilities [Line Items] |  |  |
Financial Liabilities | 0 | 0 |
At fair value | Level 1 | Marketable securities |  |  |
Disclosure Of Fair Value Measurements Of Assets And Liabilities [Line Items] |  |  |
Financial Assets | 6,066 | 142,248 |
At fair value | Level 1 | Derivative assets |  |  |
Disclosure Of Fair Value Measurements Of Assets And Liabilities [Line Items] |  |  |
Financial Assets | 0 | 0 |
At fair value | Level 2 | Contingent consideration payable |  |  |
Disclosure Of Fair Value Measurements Of Assets And Liabilities [Line Items] |  |  |
Financial Liabilities | 0 | 0 |
At fair value | Level 2 | Derivative liability |  |  |
Disclosure Of Fair Value Measurements Of Assets And Liabilities [Line Items] |  |  |
Financial Liabilities | 1,827 | 177,395 |
At fair value | Level 2 | Marketable securities |  |  |
Disclosure Of Fair Value Measurements Of Assets And Liabilities [Line Items] |  |  |
Financial Assets | 0 | 0 |
At fair value | Level 2 | Derivative assets |  |  |
Disclosure Of Fair Value Measurements Of Assets And Liabilities [Line Items] |  |  |
Financial Assets | 37,480 | 64,001 |
At fair value | Level 3 | Contingent consideration payable |  |  |
Disclosure Of Fair Value Measurements Of Assets And Liabilities [Line Items] |  |  |
Financial Liabilities | 19,604 | 28,137 |
At fair value | Level 3 | Derivative liability |  |  |
Disclosure Of Fair Value Measurements Of Assets And Liabilities [Line Items] |  |  |
Financial Liabilities | 0 | 0 |
At fair value | Level 3 | Marketable securities |  |  |
Disclosure Of Fair Value Measurements Of Assets And Liabilities [Line Items] |  |  |
Financial Assets | 1,000 | 1,000 |
At fair value | Level 3 | Derivative assets |  |  |
Disclosure Of Fair Value Measurements Of Assets And Liabilities [Line Items] |  |  |
Financial Assets | $ 16,102 | $ 22,408 |

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