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INCOME TAXES - Movements In Temporary Differences (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | $ 23.7 | $ (18.6)
Recognized in income | (10.4) | 29.9
Recognized in OCI | (9.8) | (37.7)
Recognized in equity | 0.0 | 3.7
Business combinations | (2.1) | 47.0
Foreign currency exchange differences | (5.6) | (0.6)
Deferred tax liability (asset), end of period | (4.2) | 23.7
Non-capital loss carryforwards |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | 96.9 | 48.1
Recognized in income | (3.3) | 48.3
Recognized in OCI | 0.0 | 0.0
Recognized in equity | 0.0 | 0.0
Business combinations | 0.0 | 0.2
Foreign currency exchange differences | 5.7 | 0.3
Deferred tax liability (asset), end of period | 99.3 | 96.9
Unclaimed research & development expenditures |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | 86.6 | 70.8
Recognized in income | 75.8 | 15.9
Recognized in OCI | 0.0 | 0.0
Recognized in equity | 0.0 | 0.0
Business combinations | 0.0 | (0.1)
Foreign currency exchange differences | (0.1) | 0.0
Deferred tax liability (asset), end of period | 162.3 | 86.6
Capital loss carryforwards |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | 4.4 | 1.1
Recognized in income | 4.9 | 1.0
Recognized in OCI | 0.0 | 0.0
Recognized in equity | 0.0 | 0.0
Business combinations | 0.0 | 2.3
Foreign currency exchange differences | 0.0 | 0.0
Deferred tax liability (asset), end of period | 9.3 | 4.4
Investment tax credits |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | (85.4) | (76.4)
Recognized in income | 3.3 | (9.0)
Recognized in OCI | 0.0 | 0.0
Recognized in equity | 0.0 | 0.0
Business combinations | 0.0 | 0.0
Foreign currency exchange differences | 0.0 | 0.0
Deferred tax liability (asset), end of period | (82.1) | (85.4)
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 | (86.2) | (75.2)
Recognized in income | (23.8) | (6.5)
Recognized in OCI | 0.0 | 0.0
Recognized in equity | 0.0 | 0.0
Business combinations | (2.8) | (4.6)
Foreign currency exchange differences | (7.0) | 0.1
Deferred tax liability (asset), end of period | (119.8) | (86.2)
Intangible assets |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | (90.2) | (92.5)
Recognized in income | (19.6) | 8.3
Recognized in OCI | 0.0 | 0.0
Recognized in equity | 0.0 | 0.0
Business combinations | 0.0 | (5.9)
Foreign currency exchange differences | (4.9) | (0.1)
Deferred tax liability (asset), end of period | (114.7) | (90.2)
Deferred revenues, contract assets and contract liabilities |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | 1.2 | 1.5
Recognized in income | (21.6) | (42.2)
Recognized in OCI | 0.0 | 0.0
Recognized in equity | 0.0 | 0.0
Business combinations | 1.5 | 41.6
Foreign currency exchange differences | (0.3) | 0.3
Deferred tax liability (asset), end of period | (19.2) | 1.2
Foreign currency exchange difference |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | 2.6 | (1.4)
Recognized in income | (8.9) | 9.2
Recognized in OCI | 4.2 | (4.9)
Recognized in equity | 0.0 | 0.0
Business combinations | 0.0 | 0.0
Foreign currency exchange differences | (0.3) | (0.3)
Deferred tax liability (asset), end of period | (2.4) | 2.6
Derivative financial assets and liabilities |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | (0.2) | (6.5)
Recognized in income | 5.0 | 6.2
Recognized in OCI | 5.7 | 0.6
Recognized in equity | 0.0 | 0.0
Business combinations | (0.8) | 0.0
Foreign currency exchange differences | (1.1) | (0.5)
Deferred tax liability (asset), end of period | 8.6 | (0.2)
Defined benefit obligation |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | 27.2 | 57.2
Recognized in income | 0.2 | 4.3
Recognized in OCI | (19.7) | (33.4)
Recognized in equity | 0.0 | 0.0
Business combinations | 0.0 | 0.0
Foreign currency exchange differences | 0.0 | (0.9)
Deferred tax liability (asset), end of period | 7.7 | 27.2
Amounts not currently deductible |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | 83.1 | 65.0
Recognized in income | (4.7) | 4.6
Recognized in OCI | 0.0 | 0.0
Recognized in equity | 0.0 | 0.0
Business combinations | 0.0 | 13.5
Foreign currency exchange differences | 1.9 | 0.0
Deferred tax liability (asset), end of period | 80.3 | 83.1
Other |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | (16.3) | (10.3)
Recognized in income | (17.7) | (10.2)
Recognized in OCI | 0.0 | 0.0
Recognized in equity | 0.0 | 3.7
Business combinations | 0.0 | 0.0
Foreign currency exchange differences | 0.5 | 0.5
Deferred tax liability (asset), end of period | $ (33.5) | $ (16.3)

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