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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Results by segment (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disclosure of operating segments [line items]    
External revenue $ 4,707.9 $ 4,282.8
Depreciation and amortization 414.7 374.8
Share of after-tax profit of equity accounted investees 88.3 72.2
Gross profit 1,300.1 1,154.5
Operating income (loss) 729.2 (185.4)
Civil Aviation    
Disclosure of operating segments [line items]    
External revenue 2,709.3 2,435.8
Defense and Security    
Disclosure of operating segments [line items]    
External revenue 1,998.6 1,847.0
Operating segments    
Disclosure of operating segments [line items]    
External revenue 4,707.9 4,282.8
Depreciation and amortization 414.7 368.7
Share of after-tax profit of equity accounted investees 88.3 72.2
Gross profit 1,300.1 1,154.5
Operating income (loss) 729.2 (185.4)
Adjusted segment operating income 732.0 549.7
Operating segments | Civil Aviation    
Disclosure of operating segments [line items]    
External revenue 2,709.3 2,435.8
Depreciation and amortization 312.4 272.0
Share of after-tax profit of equity accounted investees 68.3 60.8
Gross profit 883.6 867.8
Operating income (loss) 605.3 442.0
Adjusted segment operating income 581.5 548.9
Operating segments | Defense and Security    
Disclosure of operating segments [line items]    
External revenue 1,998.6 1,847.0
Depreciation and amortization 102.3 96.7
Share of after-tax profit of equity accounted investees 20.0 11.4
Gross profit 416.5 286.7
Operating income (loss) 123.9 (627.4)
Adjusted segment operating income $ 150.5 $ 0.8