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OTHER GAINS - NET - Narrative (Details) - CAD ($) $ in Millions |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 27, 2019 | Nov. 17, 2017 | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2017 | Mar. 31, 2019 | Mar. 31, 2018
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Remeasurement of investment, net of reorganization and others costs |  |  |  |  |  |  |  | $ 3.7 | $ 12.2
CAE Simulation Technologies Private Limited |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Ownership interest in joint venture |  |  | 25.00% |  |  |  |  | 50.00% | 25.00%
Zhuhai Xiang Yi Aviation Technology Company Limited |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Equity method investment sold, percentage |  |  |  |  |  | 49.00% |  |  |
Proceeds from sale of investments |  |  |  |  |  | $ 114.0 |  |  |
Asian Aviation Centre of Excellence Sdn. Bhd. |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Ownership interest in joint venture |  | 50.00% |  |  |  |  | 50.00% |  |
CAE Flight Training (India) Private Limited |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Ownership interest in joint venture |  |  | 50.00% |  |  |  |  |  |
Bombardier's BAT Business |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Restructuring, integration and acquisition costs |  |  | $ 6.8 |  |  |  |  |  |
CAE Simulation Technologies Private Limited |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Ownership interest in subsidiary |  |  |  | 50.00% |  |  |  |  |
CAE Flight Training (India) Private Limited |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Ownership interest in joint venture | 50.00% |  |  |  |  |  |  |  |
Ownership interest in subsidiary |  |  |  | 100.00% |  |  |  |  |
Remeasurement of investment, net of reorganization and others costs |  |  |  | $ 3.7 |  |  |  |  |
Asian Aviation Centre of Excellence Sdn. Bhd. |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Impairment loss |  |  |  |  | $ 9.4 |  |  |  |
Ownership interest in subsidiary |  | 100.00% |  |  | 100.00% |  |  |  |
Gain (loss) recognised as result of remeasuring to fair value equity interest in previously held interest |  |  |  |  | $ 34.7 |  |  |  |
Remeasurement of equity method investments, costs |  |  |  |  | 8.5 |  |  |  |
Restructuring, integration and acquisition costs |  |  |  |  | 1.5 |  |  |  |
Remeasurement of investment, net of reorganization and others costs |  |  |  |  | 12.2 |  |  |  |
Reorganization and other costs |  |  |  |  | 8.2 |  |  |  |
Gain (losses) on remeasurement of equity method investments, net of costs |  |  |  |  | 4.0 |  |  |  |
Investments accounted for using equity method | Zhuhai Xiang Yi Aviation Technology Company Limited |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Impairment loss |  |  |  |  |  | 7.0 |  |  |
Gains (losses) on disposals of investments |  |  |  |  |  | 14.3 |  |  |
Goodwill | Zhuhai Xiang Yi Aviation Technology Company Limited |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Disposals, goodwill |  |  |  |  |  | $ 6.3 |  |  |
Goodwill | Asian Aviation Centre of Excellence Sdn. Bhd. |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Disposals, goodwill |  |  |  |  | $ 4.6 |  |  |  |
Civil Aviation Training Solutions |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Impairment loss |  |  | $ 4.9 |  |  |  |  |  |

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