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GAIN ON REMEASUREMENT OF PREVIOUSLY HELD EQUITY INTEREST (Details) - CAD ($)
$ in Millions
7 Months Ended 12 Months Ended
Nov. 05, 2024
Nov. 04, 2024
Mar. 31, 2025
Mar. 31, 2024
Disclosure of information about consolidated structured entities [line items]        
Gain (loss) recognised as result of remeasuring to fair value equity interest in acquiree held by acquirer before business combination     $ 72.6 $ 0.0
Disposal of discontinued operations       $ 120.4
SIMCOM        
Disclosure of information about consolidated structured entities [line items]        
Equity interest in joint venture (in percent)   50.00%    
SIMCOM        
Disclosure of information about consolidated structured entities [line items]        
Gain (loss) recognised as result of remeasuring to fair value equity interest in acquiree held by acquirer before business combination $ 72.6      
Disposal of discontinued operations 29.4      
Cumulative foreign exchange differences derecognised 7.7      
Other expenses $ 5.3