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FINANCIAL RISK MANAGEMENT - Letters Of Credit And Guarantees (Details) - CAD ($) $ in Millions | Mar. 31, 2021 | Mar. 31, 2020
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Disclosure of notes and other explanatory information [Abstract] |  |
Advance payment | $ 41.0 | $ 36.0
Contract performance | 46.4 | 44.0
Lease obligations | 30.1 | 37.1
Financial obligations | 70.3 | 63.0
Other | 8.4 | 9.5
Letters of credit and guarantees, net | $ 196.2 | $ 189.6

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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