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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Results by segment (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Disclosure of operating segments [line items]    
External revenue $ 4,282.8 $ 4,010.6
Depreciation and amortization 374.8 342.2
Share of after-tax profit of equity accounted investees 72.2 53.2
Operating income (loss) (185.4) 466.0
Operating segments    
Disclosure of operating segments [line items]    
External revenue 4,282.8 4,010.6
Depreciation and amortization 368.7 330.2
Share of after-tax profit of equity accounted investees 72.2 53.2
Operating income (loss) (185.4) 466.0
Adjusted segment operating income 549.7 538.4
Operating segments | Civil Aviation    
Disclosure of operating segments [line items]    
External revenue 2,435.8 2,166.4
Depreciation and amortization 272.0 243.4
Share of after-tax profit of equity accounted investees 60.8 47.0
Operating income (loss) 442.0 430.3
Adjusted segment operating income 548.9 485.3
Operating segments | Defense and Security    
Disclosure of operating segments [line items]    
External revenue 1,847.0 1,844.2
Depreciation and amortization 96.7 86.8
Share of after-tax profit of equity accounted investees 11.4 6.2
Operating income (loss) (627.4) 35.7
Adjusted segment operating income $ 0.8 $ 53.1