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BUSINESS COMBINATIONS - Narrative (Details) $ in Millions, $ in Millions |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 27, 2019 CAD ($) | Jan. 30, 2019 CAD ($) | Nov. 17, 2017 CAD ($) training_centre | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 CAD ($) | Mar. 31, 2019 CAD ($) | Mar. 31, 2018 CAD ($) | Mar. 26, 2019 | Mar. 13, 2019 CAD ($) | Mar. 07, 2019 CAD ($) | Jan. 29, 2019 | Jul. 31, 2018 CAD ($) | Nov. 17, 2017 USD ($)
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro forma revenue |  |  |  |  |  |  | $ 330.0 |  |  |  |  |  |  |
Pro forma operating income |  |  |  |  |  |  | 50.0 |  |  |  |  |  |  |
Contingent consideration arising on business combinations |  |  |  |  |  |  | $ 11.9 | $ 11.0 |  |  |  |  |  |
Identifiable assets acquired |  |  | $ 114.9 |  |  |  |  |  |  |  |  |  |  |
Goodwill expected to be not deductible for tax purposes |  |  | $ 53.0 |  |  |  |  |  |  |  |  |  |  |
Asian Aviation Centre of Excellence Sdn. Bhd. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture |  |  | 50.00% |  |  | 50.00% |  |  |  |  |  |  |  |
Philippine Academy for Aviation Training Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture |  |  | 50.00% |  |  |  | 40.00% | 40.00% |  |  |  |  |  |
Alpha-Omega Change Engineering Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  |  |  |  |  | $ 34.4 |
Avianca-CAE Flight Training |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  | $ 50.1 |  |  |  |  |  |  |  |  |  |  |  |
Term of outsourcing agreement |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |
Equity interests acquired |  | 50.00% |  |  |  |  |  |  |  |  |  | 50.00% |  |
Logitude Oy |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  |  |  | $ 8.7 |  |  |
Bombardier's BAT Business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  | $ 709.9 |  |  | $ 709.9 |  |  |  |
Intangible assets |  |  |  |  |  |  | 695.8 |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  | 134.6 |  |  |  |  |  |  |
Non-current liabilities |  |  |  |  |  |  | 2.7 |  |  |  |  |  |  |
Identifiable assets acquired |  |  |  |  |  |  | 706.4 |  |  |  |  |  |  |
CAE Flight Training (India) Private Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interests acquired | 50.00% |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
Ownership interest in joint venture | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in subsidiary |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  | 832.4 |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | 811.5 |  |  |  |  |  |  |
Goodwill recognised as of acquisition date |  |  |  |  |  |  | 443.0 |  |  |  |  |  |  |
Goodwill expected to be deductible for tax purposes |  |  |  |  |  |  | 334.5 |  |  |  |  |  |  |
Fair value of acquired receivables |  |  |  |  |  |  | 23.6 |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  | 175.2 |  |  |  |  |  |  |
Non-current liabilities |  |  |  |  |  |  | 51.7 |  |  |  |  |  |  |
Identifiable assets acquired |  |  |  |  |  |  | 839.9 |  |  |  |  |  |  |
CAE Simulation Technologies Private Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interests acquired | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in subsidiary |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
Indian Training Centres |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration | $ 31.5 |  |  |  |  |  |  |  |  |  |  |  |  |
Portfolio Of Training Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  | $ 24.7 |  |  |  |  |  |  |  |
Goodwill recognised as of acquisition date |  |  |  |  |  | 4.6 |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  | 24.7 |  |  |  |  |  |  |  |
Non-current assets |  |  |  |  |  | 1.4 |  |  |  |  |  |  |  |
Non-current liabilities |  |  |  |  |  | $ 6.0 |  |  |  |  |  |  |  |
Asian Aviation Centre of Excellence Sdn. Bhd. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  | $ 114.8 |  |  |  |  |  |  |  |  |  |  | $ 90
Equity interests acquired |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  | 50.00%
Intangible assets |  |  | $ 114.9 |  |  |  |  |  |  |  |  |  |  |
Fair value of acquired receivables |  |  | 14.0 |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  | 103.0 |  |  |  |  |  |  |  |  |  |  |
Non-current liabilities |  |  | 16.8 |  |  |  |  |  |  |  |  |  |  |
Contingent consideration arising on business combinations |  |  | $ 10.7 |  |  |  |  |  |  |  |  |  |  | $ 10
Ownership interest in subsidiary |  |  | 100.00% |  | 100.00% |  |  |  |  |  |  |  |  |
Number of training centres | training_centre |  |  | 3 |  |  |  |  |  |  |  |  |  |  |
Identifiable assets acquired |  |  | $ 199.1 |  |  |  |  |  |  |  |  |  |  |
Licenses | Total |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | 169.5 |  |  |  |  |  |  |
Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets other than goodwill |  |  | $ 61.6 |  |  |  |  |  |  |  |  |  |  |
Customer relationships | Total |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | 191.4 |  |  |  |  |  |  |
Other intangible assets | Total |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | $ 7.6 |  |  |  |  |  |  |

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