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RELATED PARTY RELATIONSHIPS (Details) - CAD ($) $ in Millions |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 17, 2017 | Sep. 30, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Disclosure of transactions between related parties [line items] |  |  |  |
Unrecognized share of losses of joint ventures |  |  | $ 7.0 | $ (1.7)
Cumulative unrecognised share of losses of joint ventures |  |  | 15.9 | 8.9
Cumulative unrecognised share of comprehensive losses of joint ventures |  |  | $ 17.1 | $ 10.5
Asian Aviation Centre of Excellence Sdn. Bhd. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in joint venture | 50.00% | 50.00% |  |
Aviation Training Northeast Asia B.V. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in joint venture |  |  | 50.00% | 50.00%
CAE Flight and Simulator Services Korea, Ltd. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in joint venture |  |  | 50.00% | 50.00%
CAE Flight Training (India) Private Limited |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in joint venture |  |  | 50.00% | 50.00%
CAE-LIDER Training do Brasil Ltda. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in joint venture |  |  | 50.00% | 50.00%
CAE Melbourne Flight Training Pty Ltd. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in joint venture |  |  | 50.00% | 50.00%
China Southern West Australia Flying College Pty Ltd. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in joint venture |  |  | 47.12% | 47.12%
Embraer CAE Training Services, LLC |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in joint venture |  |  | 49.00% | 49.00%
Emirates-CAE Flight Training LLC |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in joint venture |  |  | 49.00% | 49.00%
Flight Training Alliance GmbH (JV) |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in joint venture |  |  | 50.00% | 50.00%
HATSOFF Helicopter Training Private Limited |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in joint venture |  |  | 50.00% | 50.00%
HFTS Helicopter Flight Training Services GmbH |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in joint venture |  |  | 25.00% | 25.00%
JAL CAE Flight Training Co. Ltd. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in joint venture |  |  | 50.00% | 50.00%
National Flying Training Institute Private Limited |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in joint venture |  |  | 51.00% | 51.00%
Pegasus Ucus Egitim Merkezi A.S. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in joint venture |  |  | 49.90% | 49.90%
Pelesys Learning Systems Inc. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in joint venture |  |  | 45.00% | 0.00%
Percentage of voting equity interests acquired |  |  | 45.00% |
Cash transferred |  |  | $ 7.7 |
Percent of joint venture held by co-venturer |  |  | 55.00% |
Philippine Academy for Aviation Training Inc |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in joint venture | 50.00% |  | 40.00% | 20.00%
Rotorsim s.r.l. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in joint venture |  |  | 50.00% | 50.00%
Rotorsim USA LLC |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in joint venture |  |  | 50.00% | 50.00%
Zhuhai Free Trade Zone Xiang Yi Aviation Technology Company Limited |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in joint venture |  |  | 0.00% | 49.00%
Zhuhai Xiang Yi Aviation Technology Company Limited |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in joint venture |  |  | 0.00% | 49.00%
Asian Aviation Centre of Excellence Sdn. Bhd. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 50.00%
CAE Kuala Lumpur Sdn Bdh |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 50.00%
Asian Aviation Centre of Excellence (Singapore) Pte Ltd |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 50.00%
CAE (UK) plc |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE (US) Inc. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Aircrew Training Services plc |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 76.45% | 76.45%
CAE Australia Pty Ltd. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Aviation Services Pte Ltd. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Aviation Training B.V. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Aviation Training Chile Limitada |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Aviation Training Peru S.A. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Brunei Multi Purpose Training Centre Sdn Bhd |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 60.00% | 60.00%
CAE Center Amsterdam B.V. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Center Brussels N.V. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Centre Copenhagen A/S |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Centre Hong Kong Limited |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Centre Oslo AS |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Centre Stockholm AB |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE CFT B.V. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE CFT Korea Ltd. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Civil Aviation Training Solutions, Inc. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Electronik GmbH |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Euroco S.à r.l. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 0.00% | 100.00%
CAE Flight & Simulator Services Sdn. Bhd. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Flight Training Center Mexico, S.A. de C.V. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Global Academy Évora, SA |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Healthcare Canada Inc. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Healthcare, Inc. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Holdings Limited |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE India Private Limited |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Integrated Enterprise Solutions Australia Pty Ltd. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE International Holdings Limited |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Luxembourg Acquisition S.à r.l. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Luxembourg Financing S.à r.l. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 0.00% | 100.00%
CAE Maritime Middle East LLC |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 49.00% | 49.00%
CAE Middle East L.L.C. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 49.00% | 49.00%
CAE Military Aviation Training Inc. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE New Zealand Pty Ltd. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE North East Training Inc. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Oxford Aviation Academy Amsterdam B.V. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Oxford Aviation Academy Phoenix Inc. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Services Italia S.r.l. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Servicios Globales de Instrucción de Vuelo (España), S.L. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Shanghai Company, Limited |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE SimuFlite Inc. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Simulation Technologies Private Limited |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Simulator Services Inc. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Singapore (S.E.A.) Pte Ltd. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE South America Flight Training do Brasil Ltda. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE STS Limited |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Training & Services Brussels NV |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Training & Services UK Ltd. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Training Norway AS |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE USA Inc. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
CAE Verwaltungsgesellschaft mbH |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
Flight Simulator-Capital L.P. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 0.00% | 100.00%
Oxford Aviation Academy (Oxford) Limited |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
Parc Aviation Limited |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
Parc Aviation Engineering Services Ltd |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
Parc Aviation UK Ltd |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
Parc Interim Limited |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
Presagis Canada Inc. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
Presagis Europe (S.A.) |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
Presagis USA Inc. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
Servicios de Instrucción de Vuelo, S.L. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 80.00% | 80.00%
SIM-Industries Brasil Administracao de Centros de Treinamento Ltda. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% | 100.00%
SIV Ops Training, S.L. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 80.00% | 80.00%

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