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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Reconciliation of adjusted segment operating income (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disclosure of operating segments [line items]    
Operating income $ 48.4 $ 537.1
Restructuring, integration and acquisition costs 124.0 15.8
Impairment of goodwill 0.0 37.5
Impairment loss on non-financial assets, COVID-19 103.5 0.0
Income, Government contributions relating to Covid-19 127.4  
Defence and Security    
Disclosure of operating segments [line items]    
Restructuring, integration and acquisition costs   9.7
Operating segments    
Disclosure of operating segments [line items]    
Operating income 48.4 537.1
Restructuring, integration and acquisition costs 124.0 15.8
Impairment of goodwill 0.0 37.5
Impairment and other gains and losses incurred in relation to the COVID-19 pandemic 108.2 0.0
Adjusted segment operating income (loss) 280.6 590.4
Operating segments | Civil Aviation Training Solutions    
Disclosure of operating segments [line items]    
Operating income 6.5 473.3
Restructuring, integration and acquisition costs 76.1 6.1
Impairment of goodwill 0.0 0.0
Impairment and other gains and losses incurred in relation to the COVID-19 pandemic 81.7 0.0
Adjusted segment operating income (loss) 164.3 479.4
Operating segments | Defence and Security    
Disclosure of operating segments [line items]    
Operating income 15.5 104.8
Restructuring, integration and acquisition costs 45.0 9.7
Impairment of goodwill 0.0 0.0
Impairment and other gains and losses incurred in relation to the COVID-19 pandemic 26.5 0.0
Adjusted segment operating income (loss) 87.0 114.5
Operating segments | Healthcare    
Disclosure of operating segments [line items]    
Operating income 26.4 (41.0)
Restructuring, integration and acquisition costs 2.9 0.0
Impairment of goodwill 0.0 37.5
Impairment and other gains and losses incurred in relation to the COVID-19 pandemic 0.0 0.0
Adjusted segment operating income (loss) $ 29.3 $ (3.5)