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INCOME TAXES - Movements In Temporary Differences (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | $ 66.1 | $ 70.2
Recognized in income | 33.3 | (2.9)
Recognized in OCI | (14.9) | 19.4
Business combinations | 0.7 | (6.6)
Foreign currency exchange differences | 12.7 | (5.8)
Deferred tax liability (asset), end | 18.6 | 66.1
Deferred tax assets and liabilities, Recognized in equity | 15.7 |
Non-capital loss carryforwards |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | (33.4) | (35.2)
Recognized in income | 12.0 | (1.2)
Recognized in OCI | 0.0 | 0.0
Business combinations | 2.4 | 0.0
Foreign currency exchange differences | 0.3 | (0.6)
Deferred tax liability (asset), end | (48.1) | (33.4)
Deferred tax assets and liabilities, Recognized in equity | 0.0 |
Unclaimed research and development expenditures |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | (64.4) | (45.1)
Recognized in income | 5.8 | 19.3
Recognized in OCI | 0.0 | 0.0
Business combinations | 0.6 | 0.0
Foreign currency exchange differences | 0.0 | 0.0
Deferred tax liability (asset), end | (70.8) | (64.4)
Deferred tax assets and liabilities, Recognized in equity | 0.0 |
Capital loss carryforwards |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | (1.4) | (0.7)
Recognized in income | (0.3) | 0.7
Recognized in OCI | 0.0 | 0.0
Business combinations | 0.0 | 0.0
Foreign currency exchange differences | 0.0 | 0.0
Deferred tax liability (asset), end | (1.1) | (1.4)
Deferred tax assets and liabilities, Recognized in equity | 0.0 |
Investment tax credits |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | 70.0 | 74.1
Recognized in income | (6.4) | 4.1
Recognized in OCI | 0.0 | 0.0
Business combinations | 0.0 | 0.0
Foreign currency exchange differences | 0.0 | 0.0
Deferred tax liability (asset), end | 76.4 | 70.0
Deferred tax assets and liabilities, Recognized in equity | 0.0 |
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), start | 88.4 | 67.4
Recognized in income | (5.8) | (11.2)
Recognized in OCI | 0.0 | 0.0
Business combinations | 6.9 | (3.1)
Foreign currency exchange differences | 12.1 | (6.7)
Deferred tax liability (asset), end | 75.2 | 88.4
Deferred tax assets and liabilities, Recognized in equity | 0.0 |
Intangible assets |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | 93.0 | 87.4
Recognized in income | 9.0 | (1.9)
Recognized in OCI | 0.0 | 0.0
Business combinations | (11.5) | (2.9)
Foreign currency exchange differences | 3.0 | (0.8)
Deferred tax liability (asset), end | 92.5 | 93.0
Deferred tax assets and liabilities, Recognized in equity | 0.0 |
Deferred revenues, contract assets and contract liabilities |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | 15.9 | (2.0)
Recognized in income | 6.4 | (18.9)
Recognized in OCI | 0.0 | 0.0
Business combinations | 11.2 | 0.0
Foreign currency exchange differences | (0.2) | 1.0
Deferred tax liability (asset), end | (1.5) | 15.9
Deferred tax assets and liabilities, Recognized in equity | 0.0 |
Foreign currency exchange difference |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | 2.3 | 13.9
Recognized in income | 2.7 | (2.1)
Recognized in OCI | (1.6) | 13.3
Business combinations | 0.0 | 0.0
Foreign currency exchange differences | (0.2) | 0.4
Deferred tax liability (asset), end | 1.4 | 2.3
Deferred tax assets and liabilities, Recognized in equity | 0.0 |
Derivative financial assets and liabilities |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | (25.5) | (0.2)
Recognized in income | (18.9) | 15.6
Recognized in OCI | (13.0) | 9.7
Business combinations | 0.0 | 0.0
Foreign currency exchange differences | (0.1) | 0.0
Deferred tax liability (asset), end | 6.5 | (25.5)
Deferred tax assets and liabilities, Recognized in equity | 0.0 |
Defined benefit obligation |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | (53.1) | (55.4)
Recognized in income | 4.5 | 0.1
Recognized in OCI | (0.3) | (3.6)
Business combinations | 0.0 | 0.0
Foreign currency exchange differences | (0.1) | 1.2
Deferred tax liability (asset), end | (57.2) | (53.1)
Deferred tax assets and liabilities, Recognized in equity | 0.0 |
Amounts not currently deductible |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | (42.7) | (41.6)
Recognized in income | 33.2 | 1.5
Recognized in OCI | 0.0 | 0.0
Business combinations | (8.9) | (0.6)
Foreign currency exchange differences | (2.0) | 0.2
Deferred tax liability (asset), end | (65.0) | (42.7)
Deferred tax assets and liabilities, Recognized in equity | 0.0 |
Other |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | 17.0 | 7.6
Recognized in income | (8.9) | (8.9)
Recognized in OCI | 0.0 | 0.0
Business combinations | 0.0 | 0.0
Foreign currency exchange differences | (0.1) | (0.5)
Deferred tax liability (asset), end | 10.3 | $ 17.0
Deferred tax assets and liabilities, Recognized in equity | $ 15.7 |

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