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GOVERNMENT PARTICIPATION - Net Contributions Recognized and Amounts Not Yet Received (Details) - CAD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Government Grants [Abstract] |  |
Net outstanding contribution receivable, beginning of year | $ 6.3 | $ 7.7
Contributions | 29.0 | 33.3
Payments received | (29.1) | (34.7)
Net outstanding contribution receivable, end of year | $ 6.2 | $ 6.3

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- Definition Government Grants [Abstract] + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Government Participation, Contributions + References No definition available. + Details
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Balance Type: | credit
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- Definition Government Participation, Contributions Receivable + References No definition available. + Details
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Namespace Prefix: | cae_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The cash inflow from government grants, classified as investing activities. [Refer: Government [member]; Government grants] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 20 -IssueDate 2017-01-01 -Paragraph 28 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=20&date=2017-03-01&anchor=para_28&doctype=Standard -URIDate 2017-03-09 + Details
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