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INTANGIBLE ASSETS - Narrative (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Impairment of goodwill | $ 0.0 | $ 568.0
Bottom of range |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Discount rate (in percent) | 8.40% |
Top of range |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Discount rate (in percent) | 9.70% |
Civil Aviation, and Defense and Security |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Growth rate used to extrapolate cash flow projections (in years) | 5 years |
Estimated growth rate (in percent) | 2.00% |
Civil Aviation, and Defense and Security | Revenue |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Percentage of reasonably possible decrease in unobservable input, assets | 1.00% |
Civil Aviation, and Defense and Security | Financial forecast of profit (loss) for cash-generating unit |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Percentage of reasonably possible decrease in unobservable input, assets | 1.00% |
Civil Aviation, and Defense and Security | Discount rate |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Percentage of reasonably possible increase in unobservable input, assets | 1.00% |
Defense and Security |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Impairment of goodwill |  | 568.0
Discontinued operations |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Amortization | $ 0.0 | 4.1
Impairment of goodwill |  | 0.0
Cost of sales |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Amortization | 97.7 | 92.3
Research and development expenses |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Amortization | 34.8 | 32.8
Selling, general and administrative expenses |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Amortization | $ 0.0 | $ 0.2

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