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GOVERNMENT PARTICIPATION - Aggregate Contributions Recognized (Details) - CAD ($)	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Government Grants [Abstract]
Contributions credited to capitalized expenditures	$ 15,600,000	$ 16,800,000.0
Contributions credited to income	18,000,000	28,400,000.0
Total contributions	$ 33,600,000	$ 45,200,000

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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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Balance Type:	credit
Period Type:	duration

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- Definition

Government Participation, Contributions Credit to Capitalized Expenditures

+ References

No definition available.

+ Details

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Namespace Prefix:	cae_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

The amount of income recognised in relation to government grants. [Refer: Government grants]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 20
-IssueDate 2018-01-01
-Paragraph 39
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=20&date=2018-03-01&anchor=para_39_b&doctype=Standard
-URIDate 2018-03-16

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