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GOODWILL (Tables)
 12 Months Ended
Mar. 31, 2025
Disclosure of goodwill [Abstract]  
Disclosure of detailed information about goodwill
The carrying amount of goodwill acquired through business combinations has been allocated to a group of CGUs that combine to form a single operating segment, ATS Corporation, as follows:
                
As at
Note          
20252024
Balance, at April 1$1,228,600 $1,118,262 
Acquisition of subsidiaries
5
85,458 112,201 
Exchange and other adjustments (i)
80,518 (1,863)
Balance, at March 31
$1,394,576 $1,228,600