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INCOME TAXES - Movements In Temporary Differences (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | $ 196.7 | $ (4.2)
Recognized in income | (44.7) | 233.7
Recognized in OCI | 20.3 | (10.6)
Recognized in equity | 2.4 |
Business combinations | (23.7) |
Disposal of discontinued operations |  | (25.1)
Foreign currency exchange differences | 0.1 | 2.9
Deferred tax liability (asset), end of period | 151.1 | 196.7
Non-capital loss carryforwards |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | 142.5 | 98.2
Recognized in income | (61.3) | 59.4
Recognized in OCI | 0.0 | 0.0
Recognized in equity | 0.0 |
Business combinations | 3.3 |
Disposal of discontinued operations |  | (14.6)
Foreign currency exchange differences | 5.2 | (0.5)
Deferred tax liability (asset), end of period | 89.7 | 142.5
Unclaimed research & development expenditures |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | 162.1 | 162.3
Recognized in income | 59.0 | 13.5
Recognized in OCI | 0.0 | 0.0
Recognized in equity | 0.0 |
Business combinations | 0.0 |
Disposal of discontinued operations |  | (13.7)
Foreign currency exchange differences | 6.7 | 0.0
Deferred tax liability (asset), end of period | 227.8 | 162.1
Investment tax credits |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | (73.8) | (82.1)
Recognized in income | (3.0) | 5.8
Recognized in OCI | 0.0 | 0.0
Recognized in equity | 0.0 |
Business combinations | 0.0 |
Disposal of discontinued operations |  | 2.1
Foreign currency exchange differences | 0.0 | 0.4
Deferred tax liability (asset), end of period | (76.8) | (73.8)
Property, plant and equipment and right-of-use of assets |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | (154.1) | (114.8)
Recognized in income | 9.3 | (41.0)
Recognized in OCI | 0.0 | 0.0
Recognized in equity | 0.0 |
Business combinations | (11.1) |
Disposal of discontinued operations |  | 1.1
Foreign currency exchange differences | (12.1) | 0.6
Deferred tax liability (asset), end of period | (168.0) | (154.1)
Intangible assets |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | (39.0) | (114.7)
Recognized in income | (59.7) | 64.6
Recognized in OCI | 0.0 | 0.0
Recognized in equity | 0.0 |
Business combinations | (26.3) |
Disposal of discontinued operations |  | 10.5
Foreign currency exchange differences | (1.8) | 0.6
Deferred tax liability (asset), end of period | (126.8) | (39.0)
Amounts not currently deductible including interest limitation |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | 76.9 | 80.3
Recognized in income | 22.7 | 3.0
Recognized in OCI | 0.0 | 0.0
Recognized in equity | 2.4 |
Business combinations | 6.5 |
Disposal of discontinued operations |  | (6.9)
Foreign currency exchange differences | 2.2 | 0.5
Deferred tax liability (asset), end of period | 110.7 | 76.9
Government participation |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | 86.4 | (32.6)
Recognized in income | 7.2 | 118.7
Recognized in OCI | 0.0 | 0.0
Recognized in equity | 0.0 |
Business combinations | 0.0 |
Disposal of discontinued operations |  | 0.3
Foreign currency exchange differences | 0.0 | 0.0
Deferred tax liability (asset), end of period | 93.6 | 86.4
Other |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | (4.3) | (0.8)
Recognized in income | (18.9) | 9.7
Recognized in OCI | 20.3 | (10.6)
Recognized in equity | 0.0 |
Business combinations | 3.9 |
Disposal of discontinued operations |  | (3.9)
Foreign currency exchange differences | (0.1) | 1.3
Deferred tax liability (asset), end of period | $ 0.9 | $ (4.3)

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