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ACCOUNTS RECEIVABLE - Credit loss allowance (Details) - Accumulated impairment - CAD ($)
$ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disclosure of financial assets [line items]    
Credit loss allowances, beginning of year $ (20.9)  
Credit loss allowances, end of year (21.3) $ (20.9)
Accounts receivable    
Disclosure of financial assets [line items]    
Credit loss allowances, beginning of year (20.9) (25.5)
Additions (3.4) (8.3)
Amounts charged off 3.7 9.4
Unused amounts reversed 0.3 2.2
Disposal of discontinued operations (Note 3) 0.0 0.9
Foreign currency exchange differences (1.0) 0.4
Credit loss allowances, end of year $ (21.3) $ (20.9)