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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