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FINANCIAL RISK MANAGEMENT - Letters Of Credit And Guarantees (Details) - CAD ($) $ in Millions | Mar. 31, 2018 | Mar. 31, 2017
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Disclosure of notes and other explanatory information [Abstract] |  |
Advance payment | $ 56.7 | $ 64.3
Contract performance | 39.6 | 47.7
Lease obligations | 36.2 | 35.3
Financial obligations | 88.7 | 88.1
Other | 2.2 | 2.8
Letters of credit and guarantees, net | $ 223.4 | $ 238.2

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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