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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Results by segment (Details) $ in Millions, $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2019 CAD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 CAD ($) | Mar. 31, 2018 USD ($)
Disclosure of operating segments [line items] |  |  |  |
Revenue | $ 3,304.1 |  | $ 2,823.5 |
Impairment loss on non-financial assets |  | $ (4.9) |  | $ 0.0
After tax share in profit of equity accounted investees | 33.4 |  | 43.2 |
Segment operating income | 480.6 |  | 462.8 |
Operating segments |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenue | 3,304.1 |  | 2,823.5 |
Depreciation and amortization expense, property, plant and equipment | 137.6 |  | 120.8 |
Depreciation and amortization expense, intangible and other assets | 79.6 |  | 78.8 |
Write-downs (reversals of write-downs) of inventories | 1.7 |  | 3.4 |
Impairment loss (reversal of impairment loss) recognised in profit or loss, trade receivables | 4.6 |  | 9.1 |
After tax share in profit of equity accounted investees | 33.4 |  | 43.2 |
Segment operating income | 480.6 |  | 462.8 |
Operating segments | Civil Aviation Training Solutions |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenue | 1,875.8 |  | 1,625.3 |
Depreciation and amortization expense, property, plant and equipment | 115.9 |  | 99.1 |
Depreciation and amortization expense, intangible and other assets | 41.3 |  | 37.5 |
Impairment loss on non-financial assets |  | (4.9) |  | 0.0
Write-downs (reversals of write-downs) of inventories | 0.7 |  | 2.6 |
Impairment loss (reversal of impairment loss) recognised in profit or loss, trade receivables | 4.4 |  | 9.2 |
After tax share in profit of equity accounted investees | 23.0 |  | 32.2 |
Segment operating income | 344.3 |  | 330.1 |
Operating segments | Defense and Security |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenue | 1,306.7 |  | 1,083.0 |
Depreciation and amortization expense, property, plant and equipment | 19.0 |  | 19.1 |
Depreciation and amortization expense, intangible and other assets | 27.5 |  | 30.8 |
Impairment loss on non-financial assets |  | 0.0 |  | 0.0
Write-downs (reversals of write-downs) of inventories | 0.9 |  | 0.8 |
Impairment loss (reversal of impairment loss) recognised in profit or loss, trade receivables | 0.2 |  | 0.0 |
After tax share in profit of equity accounted investees | 10.4 |  | 11.0 |
Segment operating income | 131.5 |  | 123.9 |
Operating segments | Healthcare |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenue | 121.6 |  | 115.2 |
Depreciation and amortization expense, property, plant and equipment | 2.7 |  | 2.6 |
Depreciation and amortization expense, intangible and other assets | 10.8 |  | 10.5 |
Impairment loss on non-financial assets |  | $ 0.0 |  | $ 0.0
Write-downs (reversals of write-downs) of inventories | 0.1 |  | 0.0 |
Impairment loss (reversal of impairment loss) recognised in profit or loss, trade receivables | 0.0 |  | (0.1) |
After tax share in profit of equity accounted investees | 0.0 |  | 0.0 |
Segment operating income | $ 4.8 |  | $ 8.8 |

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