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Cover
 12 Months Ended
Mar. 31, 2025
shares
Document Information [Line Items]  
Document Type 40-F/A
Document Registration Statement false
Document Annual Report true
Document Period End Date Mar. 31, 2025
Current Fiscal Year End Date --03-31
Entity Registrant Name ATS Corp /ATS
Entity Incorporation, State or Country Code Z4
Entity File Number 98-0149239
Entity Address, Address Line One 730 Fountain Street North
Entity Address, Address Line Two Building 3
Entity Address, City or Town Cambridge
Entity Address, State or Province ON
Entity Address, Postal Zip Code N3H 4R7
City Area Code 519
Local Phone Number 653-6500
Title of 12(b) Security Common Shares
Trading Symbol ATS
Security Exchange Name NYSE
Annual Information Form true
Audited Annual Financial Statements true
Entity Common Stock, Shares Outstanding 96,885,705
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Emerging Growth Company false
ICFR Auditor Attestation Flag true
Document Financial Statement Error Correction [Flag] false
Amendment Flag false
Entity Central Index Key 0001394832
Document Fiscal Period Focus FY
Document Fiscal Year Focus 2025
Business Contact  
Document Information [Line Items]  
Contact Personnel Name Corporation Service Company
Entity Address, Address Line One 251 Little Falls Drive
Entity Address, City or Town Wilmington
Entity Address, State or Province DE
Entity Address, Postal Zip Code 19808
City Area Code 800
Local Phone Number 927-9800