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Marketable Securities and Derivatives - Marketable Securities (Details) - CAD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Apr. 25, 2019 | Sep. 27, 2018 | Jun. 30, 2020 | Jun. 30, 2019
Unrealized (loss) gain on marketable securities |  |  |  |
OCI unrealized (loss) gain |  |  | $ (43,613) | $ (78,837)
EnWave |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Transfer from (to) investment in associates |  |  | 0 |
Marketable securities designated at FVTOCI |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Beginning balance |  |  | 143,248 | 59,188
(Disposals) additions |  |  | (90,794) | (35,344)
Transfer from (to) investment in associates |  |  | (1,775) | 280,702
Unrealized (loss) gain on changes in fair value |  |  | (43,613) | (78,837)
Spin-out |  |  |  | (82,461)
Ending balance |  |  | 7,066 | 143,248
Unrealized (loss) gain on marketable securities |  |  |  |
OCI unrealized (loss) gain |  |  | (43,613) | (78,837)
Marketable securities designated at FVTOCI | Micron | Level 1 |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Beginning balance |  |  | 1,148 | 2,426
(Disposals) additions |  |  | (191) | 0
Transfer from (to) investment in associates |  |  | 0 | 0
Unrealized (loss) gain on changes in fair value |  |  | (957) | (1,278)
Spin-out |  |  |  | 0
Ending balance |  |  | 0 | 1,148
Unrealized (loss) gain on marketable securities |  |  |  |
OCI unrealized (loss) gain |  |  | (957) | (1,278)
Marketable securities designated at FVTOCI | Radient |  |  |  |
Unrealized (loss) gain on marketable securities |  |  |  |
OCI unrealized (loss) gain |  |  | (24,800) | (13,200)
Marketable securities designated at FVTOCI | Radient | Level 1 |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Beginning balance |  |  | 30,866 | 44,043
(Disposals) additions |  |  | 0 | 0
Transfer from (to) investment in associates |  |  | 0 | 0
Unrealized (loss) gain on changes in fair value |  |  | (24,845) | (13,177)
Spin-out |  |  |  | 0
Ending balance |  |  | 6,021 | 30,866
Unrealized (loss) gain on marketable securities |  |  |  |
OCI unrealized (loss) gain |  |  | (24,845) | (13,177)
Marketable securities designated at FVTOCI | TGOD |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Transfer from (to) investment in associates |  | $ 275,300 |  |
Unrealized (loss) gain on changes in fair value |  |  | (6,700) |
Marketable securities designated at FVTOCI | TGOD | Level 1 |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Beginning balance |  |  | 93,132 | 0
(Disposals) additions |  |  | (86,465) | (46,663)
Transfer from (to) investment in associates |  |  | 0 | 275,342
Unrealized (loss) gain on changes in fair value |  |  | (6,667) | (135,547)
Spin-out |  |  |  | 0
Ending balance |  |  | 0 | 93,132
Unrealized (loss) gain on marketable securities |  |  |  |
OCI unrealized (loss) gain |  |  | (6,667) | (135,547)
Marketable securities designated at FVTOCI | ACI | Level 1 |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Beginning balance |  |  | 0 | 0
(Disposals) additions |  |  | 0 | 228
Transfer from (to) investment in associates |  |  | 0 | 5,360
Unrealized (loss) gain on changes in fair value |  |  | 0 | 76,873
Spin-out |  |  |  | (82,461)
Ending balance |  |  | 0 | 0
Unrealized (loss) gain on marketable securities |  |  |  |
OCI unrealized (loss) gain |  |  | 0 | 76,873
Marketable securities designated at FVTOCI | Choom |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Transfer from (to) investment in associates |  |  | (1,800) |
Unrealized (loss) gain on changes in fair value |  |  | (2,600) |
Marketable securities designated at FVTOCI | Choom | Level 1 |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Beginning balance |  |  | 4,388 | 12,719
(Disposals) additions |  |  | 0 | 0
Transfer from (to) investment in associates |  |  | (1,775) | 0
Unrealized (loss) gain on changes in fair value |  |  | (2,613) | (8,331)
Spin-out |  |  |  | 0
Ending balance |  |  | 0 | 4,388
Unrealized (loss) gain on marketable securities |  |  |  |
OCI unrealized (loss) gain |  |  | (2,613) | (8,331)
Marketable securities designated at FVTOCI | EnWave |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Unrealized (loss) gain on changes in fair value | $ (8,500) |  |  |
Marketable securities designated at FVTOCI | EnWave | Level 1 |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Beginning balance |  |  | 12,619 | 0
(Disposals) additions |  |  | (4,138) | 10,000
Transfer from (to) investment in associates |  |  |  | 0
Unrealized (loss) gain on changes in fair value |  |  | (8,481) | 2,619
Spin-out |  |  |  | 0
Ending balance |  |  | 0 | 12,619
Unrealized (loss) gain on marketable securities |  |  |  |
OCI unrealized (loss) gain |  |  | (8,481) | 2,619
Marketable securities designated at FVTOCI | Other immaterial investments | Level 3 |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Beginning balance |  |  | 1,095 | 0
(Disposals) additions |  |  | 0 | 1,091
Transfer from (to) investment in associates |  |  | 0 | 0
Unrealized (loss) gain on changes in fair value |  |  | (50) | 4
Spin-out |  |  |  | 0
Ending balance |  |  | 1,045 | 1,095
Unrealized (loss) gain on marketable securities |  |  |  |
OCI unrealized (loss) gain |  |  | $ (50) | $ 4

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