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INCOME TAXES - Movements In Temporary Differences (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start $ (123.5) $ (170.0)
Deferred tax expense (income) recognised in profit or loss 23.1 33.9
Income tax relating to components of other comprehensive income 1.1 11.6
Increase (decrease) through business combinations, deferred tax liability (asset) 27.2 (3.9)
Increase (decrease) through net exchange differences, deferred tax liability (asset) (3.9) 4.9
Deferred tax liability (asset), end (76.0) (123.5)
Non-capital loss carryforwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 45.7 50.5
Deferred tax expense (income) recognised in profit or loss (9.6) (5.4)
Income tax relating to components of other comprehensive income 0.0 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) 0.8 0.0
Increase (decrease) through net exchange differences, deferred tax liability (asset) (1.7) 0.6
Deferred tax liability (asset), end 35.2 45.7
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 expense (income) recognised in profit or loss 0.7  
Income tax relating to components of other comprehensive income 0.0  
Increase (decrease) through business combinations, deferred tax liability (asset) 0.0  
Increase (decrease) through net exchange differences, deferred tax liability (asset) 0.0  
Deferred tax liability (asset), end 0.7 0.0
Intangible assets    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start (87.8) (84.1)
Deferred tax expense (income) recognised in profit or loss 5.7 12.5
Income tax relating to components of other comprehensive income 0.0 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) (6.2) (14.5)
Increase (decrease) through net exchange differences, deferred tax liability (asset) 0.9 (1.7)
Deferred tax liability (asset), end (87.4) (87.8)
Amounts not currently deductible    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 47.6 48.5
Deferred tax expense (income) recognised in profit or loss (2.3) (6.4)
Income tax relating to components of other comprehensive income 0.0 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) (0.7) 5.9
Increase (decrease) through net exchange differences, deferred tax liability (asset) (3.0) (0.4)
Deferred tax liability (asset), end 41.6 47.6
Deferred revenue    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 20.3 25.8
Deferred tax expense (income) recognised in profit or loss (4.5) (6.1)
Income tax relating to components of other comprehensive income 0.0 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) 14.3 0.3
Increase (decrease) through net exchange differences, deferred tax liability (asset) (1.6) 0.3
Deferred tax liability (asset), end 28.5 20.3
Tax benefit carryover    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 3.1 6.0
Deferred tax expense (income) recognised in profit or loss (1.7) (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 0.0
Increase (decrease) through net exchange differences, deferred tax liability (asset) 0.2 (0.1)
Deferred tax liability (asset), end 1.6 3.1
Unclaimed research and development expenditures    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 37.4 20.2
Deferred tax expense (income) recognised in profit or loss 7.7 17.2
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 45.1 37.4
Investment tax credits    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start (64.6) (60.0)
Deferred tax expense (income) recognised in profit or loss (9.5) (4.6)
Income tax relating to components of other comprehensive income 0.0 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) 0.0 0.0
Increase (decrease) through net exchange differences, deferred tax liability (asset) 0.0 0.0
Deferred tax liability (asset), end (74.1) (64.6)
Property, plant and equipment    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start (104.6) (148.9)
Deferred tax expense (income) recognised in profit or loss 16.4 33.1
Income tax relating to components of other comprehensive income 0.0 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) 18.3 4.5
Increase (decrease) through net exchange differences, deferred tax liability (asset) (3.3) 6.7
Deferred tax liability (asset), end (73.2) (104.6)
Unrealized (gains) losses on foreign exchange    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start (13.9) (16.0)
Deferred tax expense (income) recognised in profit or loss (1.3) 1.0
Income tax relating to components of other comprehensive income 1.0 1.3
Increase (decrease) through business combinations, deferred tax liability (asset) 0.0 (0.1)
Increase (decrease) through net exchange differences, deferred tax liability (asset) 0.3 (0.1)
Deferred tax liability (asset), end (13.9) (13.9)
Financial instruments    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start (0.3) (3.0)
Deferred tax expense (income) recognised in profit or loss (0.7) 1.3
Income tax relating to components of other comprehensive income 1.2 1.4
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 0.2 (0.3)
Government participation    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start (27.3) (27.4)
Deferred tax expense (income) recognised in profit or loss 19.9 0.1
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 (7.4) (27.3)
Employee benefit plans    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 51.6 39.6
Deferred tax expense (income) recognised in profit or loss 0.7 3.1
Income tax relating to components of other comprehensive income (1.1) 8.9
Increase (decrease) through business combinations, deferred tax liability (asset) 0.7 0.0
Increase (decrease) through net exchange differences, deferred tax liability (asset) 3.5 0.0
Deferred tax liability (asset), end 55.4 51.6
Percentage-of-completion versus completed contract    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start (28.9) (19.6)
Deferred tax expense (income) recognised in profit or loss 1.7 (8.9)
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) 0.7 (0.4)
Deferred tax liability (asset), end (26.5) (28.9)
Other    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start (1.8) (1.6)
Deferred tax expense (income) recognised in profit or loss (0.1) (0.2)
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) 0.1 0.0
Deferred tax liability (asset), end $ (1.8) $ (1.8)