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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Results by segment (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disclosure of operating segments [line items]    
External revenue $ 4,203.3 $ 3,371.3
Depreciation and amortization 342.2 310.5
Impairment (reversal) of non-financial assets – net (2.4) 41.8
Share of after-tax profit of equity accounted investees 53.2 48.5
Operating income 474.0 284.2
Operating segments    
Disclosure of operating segments [line items]    
External revenue 4,203.3 3,371.3
Depreciation and amortization 342.2 310.5
Impairment (reversal) of non-financial assets – net (2.4) 41.8
Share of after-tax profit of equity accounted investees 53.2 48.5
Operating income 474.0 284.2
Adjusted segment operating income 548.1 444.5
Operating segments | Civil Aviation    
Disclosure of operating segments [line items]    
External revenue 2,166.4 1,617.8
Depreciation and amortization 243.4 224.1
Impairment (reversal) of non-financial assets – net 1.2 34.5
Share of after-tax profit of equity accounted investees 47.0 42.1
Operating income 430.3 224.1
Adjusted segment operating income 485.3 314.7
Operating segments | Defense and Security    
Disclosure of operating segments [line items]    
External revenue 1,844.2 1,602.1
Depreciation and amortization 86.8 73.4
Impairment (reversal) of non-financial assets – net (3.5) 3.0
Share of after-tax profit of equity accounted investees 6.2 6.4
Operating income 35.7 56.0
Adjusted segment operating income 53.1 119.2
Operating segments | Healthcare    
Disclosure of operating segments [line items]    
External revenue 192.7 151.4
Depreciation and amortization 12.0 13.0
Impairment (reversal) of non-financial assets – net (0.1) 4.3
Share of after-tax profit of equity accounted investees 0.0 0.0
Operating income 8.0 4.1
Adjusted segment operating income $ 9.7 $ 10.6