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EMPLOYEE BENEFITS - Comprehensive income (before tax) (Details) - CAD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Employee benefits [Abstract]
Total actuarial losses recognized in OCI	$ (133)	$ (561)

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- Definition

Employee benefits [Abstract]

+ References

No definition available.

+ Details

Name:	ats_EmployeeBenefitsAbstract
Namespace Prefix:	ats_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2024-01-01
-Paragraph 141
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_c&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAsset
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration