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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%