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REVENUE FROM CONTRACTS WITH CUSTOMERS - Net contract assets and liabilities (Details) - CAD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023
Revenue from contracts with customers [Abstract] |  |
Costs incurred | $ 3,936,631 | $ 3,285,121
Estimated earnings | 1,354,259 | 1,091,180
Contracts in progress | 5,290,890 | 4,376,301
Progress billings | (4,898,391) | (4,145,866)
Net contract assets and liabilities | 392,499 | $ 230,435
Increase in contract asset | 177,713 |
Increase in contract liability | $ 15,649 |

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- Definition Contract Asset, Contracts in Progress + References No definition available. + Details
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Namespace Prefix: | ats_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Contract Assets, Estimated Earnings + References No definition available. + Details
Name: | ats_ContractAssetsEstimatedEarnings
Namespace Prefix: | ats_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Contract Liabilities, Progress Billings + References No definition available. + Details
Name: | ats_ContractLiabilitiesProgressBillings
Namespace Prefix: | ats_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Net Contract Assets (Liabilities) + References No definition available. + Details
Name: | ats_NetContractAssetsLiabilities
Namespace Prefix: | ats_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Revenue from contracts with customers [Abstract] + References No definition available. + Details
Name: | ats_RevenueFromContractsWithCustomersAbstract
Namespace Prefix: | ats_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of assets recognised from the costs to obtain or fulfil contracts with customers. The costs to obtain a contract with a customer are the incremental costs of obtaining the contract that the entity would not have incurred if the contract had not been obtained. The costs to fulfil a contract with a customer are the costs that relate directly to a contract or to an anticipated contract that the entity can specifically identify. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2023-01-01 -Paragraph 128 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_128_a&doctype=Standard -URIDate 2023-03-23 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition The increase (decrease) in contract assets resulting from cumulative catch-up adjustments to revenue. [Refer: Contract assets; Revenue from contracts with customers] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 15 -IssueDate 2023-01-01 -Paragraph 118 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_118_b&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The increase (decrease) in contract liabilities resulting from cumulative catch-up adjustments to revenue. [Refer: Contract liabilities; Revenue from contracts with customers] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 15 -IssueDate 2023-01-01 -Paragraph 118 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_118_b&doctype=Standard -URIDate 2023-03-23 + Details
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