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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)