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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

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