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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)