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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)