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INVENTORIES - Narrative (Details) - CAD ($) $ in Millions	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Inventories [Abstract]
Cost of inventories recognised as expense during period	$ 500.3	$ 523.5

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- Definition

Inventories [Abstract]

+ References

No definition available.

+ Details

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Namespace Prefix:	cae_
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- Definition

The amount of inventories recognised as an expense during the period. [Refer: Inventories]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 2
-IssueDate 2018-01-01
-Paragraph 36
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=2&date=2018-03-01&anchor=para_36_d&doctype=Standard
-URIDate 2018-03-16

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Period Type:	duration