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INCOME TAXES - Movements In Temporary Differences (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start $ (195.8) $ (166.3)
Deferred tax expense (income) recognised in profit or loss 35.7 (26.4)
Income tax relating to components of other comprehensive income 11.7 (7.7)
Increase (decrease) through discontinued operation and transferred from assets held for sale 0.0 0.4
Increase (decrease) through business combinations, deferred tax liability (asset) (3.9) 6.7
Increase (decrease) through net exchange differences, deferred tax liability (asset) 5.1 (2.5)
Deferred tax liability (asset), end (147.2) (195.8)
Non-capital loss carryforwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 50.5 49.4
Deferred tax expense (income) recognised in profit or loss (5.4) 0.6
Income tax relating to components of other comprehensive income 0.0 0.0
Increase (decrease) through discontinued operation and transferred from assets held for sale 0.0 0.4
Increase (decrease) through business combinations, deferred tax liability (asset) 0.0 0.0
Increase (decrease) through net exchange differences, deferred tax liability (asset) 0.6 0.1
Deferred tax liability (asset), end 45.7 50.5
Intangible assets    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start (84.1) (74.1)
Deferred tax expense (income) recognised in profit or loss 12.5 (3.0)
Income tax relating to components of other comprehensive income 0.0 0.0
Increase (decrease) through discontinued operation and transferred from assets held for sale 0.0 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) (14.5) (7.1)
Increase (decrease) through net exchange differences, deferred tax liability (asset) (1.7) 0.1
Deferred tax liability (asset), end (87.8) (84.1)
Amounts not currently deductible    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 48.5 34.3
Deferred tax expense (income) recognised in profit or loss (6.4) 14.0
Income tax relating to components of other comprehensive income 0.0 0.0
Increase (decrease) through discontinued operation and transferred from assets held for sale 0.0 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) 5.9 0.0
Increase (decrease) through net exchange differences, deferred tax liability (asset) (0.4) 0.2
Deferred tax liability (asset), end 47.6 48.5
Deferred revenue    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 25.8 25.4
Deferred tax expense (income) recognised in profit or loss (6.1) (10.2)
Income tax relating to components of other comprehensive income 0.0 0.0
Increase (decrease) through discontinued operation and transferred from assets held for sale 0.0 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) 0.3 10.5
Increase (decrease) through net exchange differences, deferred tax liability (asset) 0.3 0.1
Deferred tax liability (asset), end 20.3 25.8
Tax benefit carryover    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 6.0 5.7
Deferred tax expense (income) recognised in profit or loss (2.8) 0.2
Income tax relating to components of other comprehensive income 0.0 0.0
Increase (decrease) through discontinued operation and transferred from assets held for sale 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) 0.1
Deferred tax liability (asset), end 3.1 6.0
Unclaimed research and development expenditures    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 20.2 24.1
Deferred tax expense (income) recognised in profit or loss 17.2 (3.9)
Income tax relating to components of other comprehensive income 0.0 0.0
Increase (decrease) through discontinued operation and transferred from assets held for sale 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 37.4 20.2
Investment tax credits    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start (60.0) (56.7)
Deferred tax expense (income) recognised in profit or loss (4.6) (3.3)
Income tax relating to components of other comprehensive income 0.0 0.0
Increase (decrease) through discontinued operation and transferred from assets held for sale 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 (64.6) (60.0)
Property, plant and equipment    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start (148.9) (131.6)
Deferred tax expense (income) recognised in profit or loss 33.1 (17.5)
Income tax relating to components of other comprehensive income 0.0 0.0
Increase (decrease) through discontinued operation and transferred from assets held for sale 0.0 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) 4.5 3.3
Increase (decrease) through net exchange differences, deferred tax liability (asset) 6.7 (3.1)
Deferred tax liability (asset), end (104.6) (148.9)
Unrealized (gains) losses on foreign exchange    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start (16.0) (16.1)
Deferred tax expense (income) recognised in profit or loss 1.0 (1.3)
Income tax relating to components of other comprehensive income 1.3 1.5
Increase (decrease) through discontinued operation and transferred from assets held for sale 0.0 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) (0.1) 0.0
Increase (decrease) through net exchange differences, deferred tax liability (asset) (0.1) (0.1)
Deferred tax liability (asset), end (13.9) (16.0)
Financial instruments    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start (3.0) (1.0)
Deferred tax expense (income) recognised in profit or loss 1.3 2.1
Income tax relating to components of other comprehensive income 1.5 (4.1)
Increase (decrease) through discontinued operation and transferred from assets held for sale 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 (0.3) (3.0)
Government participation    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start (27.4) (24.9)
Deferred tax expense (income) recognised in profit or loss 0.1 (2.5)
Income tax relating to components of other comprehensive income 0.0 0.0
Increase (decrease) through discontinued operation and transferred from assets held for sale 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 (27.3) (27.4)
Employee benefit plans    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start 39.6 41.7
Deferred tax expense (income) recognised in profit or loss 3.1 3.1
Income tax relating to components of other comprehensive income 8.9 (5.1)
Increase (decrease) through discontinued operation and transferred from assets held for sale 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 (0.1)
Deferred tax liability (asset), end 51.6 39.6
Percentage-of-completion versus completed contract    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start (45.4) (40.6)
Deferred tax expense (income) recognised in profit or loss (7.1) (5.0)
Income tax relating to components of other comprehensive income 0.0 0.0
Increase (decrease) through discontinued operation and transferred from assets held for sale 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) 0.2
Deferred tax liability (asset), end (52.6) (45.4)
Other    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset), start (1.6) (1.9)
Deferred tax expense (income) recognised in profit or loss (0.2) 0.3
Income tax relating to components of other comprehensive income 0.0 0.0
Increase (decrease) through discontinued operation and transferred from assets held for sale 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 $ (1.8) $ (1.6)