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GOVERNMENT PARTICIPATION - Net Contributions Recognized and Amounts Not Yet Received (Details) - CAD ($) $ in Millions	12 Months Ended
	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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- Definition

Government Participation, Contributions

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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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

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