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GAIN ON REMEASUREMENT OF PREVIOUSLY HELD EQUITY INTEREST (Details) - CAD ($) $ in Millions |  | 7 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 05, 2024 | Nov. 04, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Disclosure of information about consolidated structured entities [line items] |  |  |  |
Gain (loss) recognised as result of remeasuring to fair value equity interest in acquiree held by acquirer before business combination |  |  | $ 72.6 | $ 0.0
Disposal of discontinued operations |  |  |  | $ 120.4
SIMCOM |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |
Equity interest in joint venture (in percent) |  | 50.00% |  |
SIMCOM |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |
Gain (loss) recognised as result of remeasuring to fair value equity interest in acquiree held by acquirer before business combination | $ 72.6 |  |  |
Disposal of discontinued operations | 29.4 |  |  |
Cumulative foreign exchange differences derecognised | 7.7 |  |  |
Other expenses | $ 5.3 |  |  |

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