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FINANCIAL RISK MANAGEMENT - Letters Of Credit And Guarantees (Details) - CAD ($) $ in Millions | Mar. 31, 2019 | Mar. 31, 2018
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Disclosure of notes and other explanatory information [Abstract] |  |
Advance payment | $ 44.7 | $ 56.7
Contract performance | 42.3 | 39.6
Lease obligations | 39.9 | 36.2
Financial obligations | 76.9 | 88.7
Other | 1.2 | 2.2
Letters of credit and guarantees, net | $ 205.0 | $ 223.4

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- Definition Advance Payments + References No definition available. + Details
Name: | cae_AdvancePayments
Namespace Prefix: | cae_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contract Performance + References No definition available. + Details
Name: | cae_ContractPerformance
Namespace Prefix: | cae_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Disclosure of notes and other explanatory information [Abstract] + References No definition available. + Details
Name: | cae_DisclosureofnotesandotherexplanatoryinformationAbstract
Namespace Prefix: | cae_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Financial Obligations + References No definition available. + Details
Name: | cae_FinancialObligations
Namespace Prefix: | cae_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lease Obligation + References No definition available. + Details
Name: | cae_LeaseObligation
Namespace Prefix: | cae_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Letters Of Credit And Guarantees, Net + References No definition available. + Details
Name: | cae_LettersOfCreditAndGuaranteesNet
Namespace Prefix: | cae_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Letters Of Credit And Guarantees, Other + References No definition available. + Details
Name: | cae_LettersOfCreditAndGuaranteesOther
Namespace Prefix: | cae_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant