XML 112 R88.htm IDEA: XBRL DOCUMENT
v3.25.1

EMPLOYEE BENEFITS - Narrative (Details) - CAD ($) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024
Employee benefits [Abstract] |  |
Estimate of contributions expected to be paid to plan for next annual reporting period | $ 0 |
Cumulative actuarial losses, net of tax | $ 2,917,000 | $ 2,797,000

X
- Definition Cumulative Actuarial Losses, Net of Tax + References No definition available. + Details
Name: | ats_CumulativeActuarialLossesNetOfTax
Namespace Prefix: | ats_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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

X
- Definition The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 147 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_147_b&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_148_d_iii&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_EstimateOfContributionsExpectedToBePaidToPlan
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration