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INCOME TAXES - Movements In Temporary Differences (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | $ (18.6) | $ (66.1)
Recognized in income | 29.9 | 33.3
Recognized in OCI | (37.7) | (14.9)
Recognized in equity | 3.7 | 15.7
Business combinations | 47.0 | 0.7
Foreign currency exchange differences | (0.6) | 12.7
Deferred tax liability (asset), end of period | 23.7 | (18.6)
Non-capital loss carryforwards |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | 48.1 | 33.4
Recognized in income | 48.3 | 12.0
Recognized in OCI | 0.0 | 0.0
Recognized in equity | 0.0 | 0.0
Business combinations | 0.2 | 2.4
Foreign currency exchange differences | 0.3 | 0.3
Deferred tax liability (asset), end of period | 96.9 | 48.1
Unclaimed research & development expenditures |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | 70.8 | 64.4
Recognized in income | 15.9 | 5.8
Recognized in OCI | 0.0 | 0.0
Recognized in equity | 0.0 | 0.0
Business combinations | (0.1) | 0.6
Foreign currency exchange differences | 0.0 | 0.0
Deferred tax liability (asset), end of period | 86.6 | 70.8
Capital loss carryforwards |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | 1.1 | 1.4
Recognized in income | 1.0 | (0.3)
Recognized in OCI | 0.0 | 0.0
Recognized in equity | 0.0 | 0.0
Business combinations | 2.3 | 0.0
Foreign currency exchange differences | 0.0 | 0.0
Deferred tax liability (asset), end of period | 4.4 | 1.1
Investment tax credits |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | (76.4) | (70.0)
Recognized in income | (9.0) | (6.4)
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 | (85.4) | (76.4)
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 | (75.2) | (88.4)
Recognized in income | (6.5) | (5.8)
Recognized in OCI | 0.0 | 0.0
Recognized in equity | 0.0 | 0.0
Business combinations | (4.6) | 6.9
Foreign currency exchange differences | 0.1 | 12.1
Deferred tax liability (asset), end of period | (86.2) | (75.2)
Intangible assets |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | (92.5) | (93.0)
Recognized in income | 8.3 | 9.0
Recognized in OCI | 0.0 | 0.0
Recognized in equity | 0.0 | 0.0
Business combinations | (5.9) | (11.5)
Foreign currency exchange differences | (0.1) | 3.0
Deferred tax liability (asset), end of period | (90.2) | (92.5)
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 | 1.5 | (15.9)
Recognized in income | (42.2) | 6.4
Recognized in OCI | 0.0 | 0.0
Recognized in equity | 0.0 | 0.0
Business combinations | 41.6 | 11.2
Foreign currency exchange differences | 0.3 | (0.2)
Deferred tax liability (asset), end of period | 1.2 | 1.5
Foreign currency exchange difference |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | (1.4) | (2.3)
Recognized in income | 9.2 | 2.7
Recognized in OCI | (4.9) | (1.6)
Recognized in equity | 0.0 | 0.0
Business combinations | 0.0 | 0.0
Foreign currency exchange differences | (0.3) | (0.2)
Deferred tax liability (asset), end of period | 2.6 | (1.4)
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 | (6.5) | 25.5
Recognized in income | 6.2 | (18.9)
Recognized in OCI | 0.6 | (13.0)
Recognized in equity | 0.0 | 0.0
Business combinations | 0.0 | 0.0
Foreign currency exchange differences | (0.5) | (0.1)
Deferred tax liability (asset), end of period | (0.2) | (6.5)
Defined benefit obligation |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | 57.2 | 53.1
Recognized in income | 4.3 | 4.5
Recognized in OCI | (33.4) | (0.3)
Recognized in equity | 0.0 | 0.0
Business combinations | 0.0 | 0.0
Foreign currency exchange differences | (0.9) | (0.1)
Deferred tax liability (asset), end of period | 27.2 | 57.2
Amounts not currently deductible |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | 65.0 | 42.7
Recognized in income | 4.6 | 33.2
Recognized in OCI | 0.0 | 0.0
Recognized in equity | 0.0 | 0.0
Business combinations | 13.5 | (8.9)
Foreign currency exchange differences | 0.0 | (2.0)
Deferred tax liability (asset), end of period | 83.1 | 65.0
Other |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), beginning of period | (10.3) | (17.0)
Recognized in income | (10.2) | (8.9)
Recognized in OCI | 0.0 | 0.0
Recognized in equity | 3.7 | 15.7
Business combinations | 0.0 | 0.0
Foreign currency exchange differences | 0.5 | (0.1)
Deferred tax liability (asset), end of period | $ (16.3) | $ (10.3)

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