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INCOME TAXES - Movements In Temporary Differences (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start $ (76.0) $ (123.5)
Deferred tax expense (income) recognised in profit or loss (2.9) 23.1
Income tax relating to components of other comprehensive income 19.4 1.1
Increase (decrease) through business combinations, deferred tax liability (asset) (6.6) 27.2
Increase (decrease) through net exchange differences, deferred tax liability (asset) (5.8) (3.9)
Deferred tax liability (asset), end (66.1) (76.0)
Non-capital loss carryforwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 35.2 45.7
Deferred tax expense (income) recognised in profit or loss (1.2) (9.6)
Income tax relating to components of other comprehensive income 0.0 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) 0.0 0.8
Increase (decrease) through net exchange differences, deferred tax liability (asset) (0.6) (1.7)
Deferred tax liability (asset), end 33.4 35.2
Unclaimed research and development expenditures    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 45.1 37.4
Deferred tax expense (income) recognised in profit or loss 19.3 7.7
Income tax relating to components of other comprehensive income 0.0 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) 0.0 0.0
Increase (decrease) through net exchange differences, deferred tax liability (asset) 0.0 0.0
Deferred tax liability (asset), end 64.4 45.1
Capital loss carryforwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 0.7 0.0
Deferred tax expense (income) recognised in profit or loss 0.7 0.7
Income tax relating to components of other comprehensive income 0.0 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) 0.0 0.0
Increase (decrease) through net exchange differences, deferred tax liability (asset) 0.0 0.0
Deferred tax liability (asset), end 1.4 0.7
Investment tax credits    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start (74.1) (64.6)
Deferred tax expense (income) recognised in profit or loss 4.1 (9.5)
Income tax relating to components of other comprehensive income 0.0 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) 0.0 0.0
Increase (decrease) through net exchange differences, deferred tax liability (asset) 0.0 0.0
Deferred tax liability (asset), end (70.0) (74.1)
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 (73.2) (104.6)
Deferred tax expense (income) recognised in profit or loss (11.2) 16.4
Income tax relating to components of other comprehensive income 0.0 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) (3.1) 18.3
Increase (decrease) through net exchange differences, deferred tax liability (asset) (6.7) (3.3)
Deferred tax liability (asset), end (88.4) (73.2)
Intangible assets    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start (87.4) (87.8)
Deferred tax expense (income) recognised in profit or loss (1.9) 5.7
Income tax relating to components of other comprehensive income 0.0 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) (2.9) (6.2)
Increase (decrease) through net exchange differences, deferred tax liability (asset) (0.8) 0.9
Deferred tax liability (asset), end (93.0) (87.4)
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 2.0 (8.6)
Deferred tax expense (income) recognised in profit or loss (18.9) (2.8)
Income tax relating to components of other comprehensive income 0.0 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) 0.0 14.3
Increase (decrease) through net exchange differences, deferred tax liability (asset) 1.0 (0.9)
Deferred tax liability (asset), end (15.9) 2.0
Foreign currency exchange difference    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start (13.9) (13.9)
Deferred tax expense (income) recognised in profit or loss (2.1) (1.3)
Income tax relating to components of other comprehensive income 13.3 1.0
Increase (decrease) through business combinations, deferred tax liability (asset) 0.0 0.0
Increase (decrease) through net exchange differences, deferred tax liability (asset) 0.4 0.3
Deferred tax liability (asset), end (2.3) (13.9)
Derivative financial assets and liabilities    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 0.2 (0.3)
Deferred tax expense (income) recognised in profit or loss 15.6 (0.7)
Income tax relating to components of other comprehensive income 9.7 1.2
Increase (decrease) through business combinations, deferred tax liability (asset) 0.0 0.0
Increase (decrease) through net exchange differences, deferred tax liability (asset) 0.0 0.0
Deferred tax liability (asset), end 25.5 0.2
Defined benefit obligation    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 55.4 51.6
Deferred tax expense (income) recognised in profit or loss 0.1 0.7
Income tax relating to components of other comprehensive income (3.6) (1.1)
Increase (decrease) through business combinations, deferred tax liability (asset) 0.0 0.7
Increase (decrease) through net exchange differences, deferred tax liability (asset) 1.2 3.5
Deferred tax liability (asset), end 53.1 55.4
Other    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 34.0 21.6
Deferred tax expense (income) recognised in profit or loss (7.4) 15.8
Income tax relating to components of other comprehensive income 0.0 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) (0.6) (0.7)
Increase (decrease) through net exchange differences, deferred tax liability (asset) (0.3) (2.7)
Deferred tax liability (asset), end 25.7 34.0
Impact of adopting IFRS 16    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 5.8  
Deferred tax liability (asset), end   5.8
Impact of adopting IFRS 16 | Non-capital loss carryforwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 0.0  
Deferred tax liability (asset), end   0.0
Impact of adopting IFRS 16 | Unclaimed research and development expenditures    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 0.0  
Deferred tax liability (asset), end   0.0
Impact of adopting IFRS 16 | Capital loss carryforwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 0.0  
Deferred tax liability (asset), end   0.0
Impact of adopting IFRS 16 | Investment tax credits    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 0.0  
Deferred tax liability (asset), end   0.0
Impact of adopting IFRS 16 | 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 5.8  
Deferred tax liability (asset), end   5.8
Impact of adopting IFRS 16 | Intangible assets    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 0.0  
Deferred tax liability (asset), end   0.0
Impact of adopting IFRS 16 | 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 0.0  
Deferred tax liability (asset), end   0.0
Impact of adopting IFRS 16 | Foreign currency exchange difference    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 0.0  
Deferred tax liability (asset), end   0.0
Impact of adopting IFRS 16 | Derivative financial assets and liabilities    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 0.0  
Deferred tax liability (asset), end   0.0
Impact of adopting IFRS 16 | Defined benefit obligation    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 0.0  
Deferred tax liability (asset), end   0.0
Impact of adopting IFRS 16 | Other    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start $ 0.0  
Deferred tax liability (asset), end   $ 0.0