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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Results by segment (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disclosure of operating segments [line items]    
External revenue $ 3,371.3 $ 2,981.9
Depreciation and amortization 310.5 319.5
Impairment of non-financial assets – net 41.8 171.7
Share of after-tax profit (loss) of equity accounted investees 48.5 2.7
Operating income 284.2 48.4
Operating segments    
Disclosure of operating segments [line items]    
External revenue 3,371.3 2,981.9
Depreciation and amortization 310.5 319.5
Impairment of non-financial assets – net 41.8 171.7
Share of after-tax profit (loss) of equity accounted investees 48.5 2.7
Operating income 284.2 48.4
Adjusted segment operating income 444.5 280.6
Operating segments | Civil Aviation    
Disclosure of operating segments [line items]    
External revenue 1,617.8 1,412.9
Depreciation and amortization 224.1 242.9
Impairment of non-financial assets – net 34.5 119.9
Share of after-tax profit (loss) of equity accounted investees 42.1 5.2
Operating income 224.1 6.5
Adjusted segment operating income 314.7 164.3
Operating segments | Defense and Security    
Disclosure of operating segments [line items]    
External revenue 1,602.1 1,217.1
Depreciation and amortization 73.4 54.3
Impairment of non-financial assets – net 3.0 43.2
Share of after-tax profit (loss) of equity accounted investees 6.4 (2.5)
Operating income 56.0 15.5
Adjusted segment operating income 119.2 87.0
Operating segments | Healthcare    
Disclosure of operating segments [line items]    
External revenue 151.4 351.9
Depreciation and amortization 13.0 22.3
Impairment of non-financial assets – net 4.3 8.6
Share of after-tax profit (loss) of equity accounted investees 0.0 0.0
Operating income 4.1 26.4
Adjusted segment operating income $ 10.6 $ 29.3