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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

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