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ACCOUNTS RECEIVABLE - Summary (Details) - CAD ($)
$ in Millions
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Disclosure of financial assets [line items]      
Accounts receivable $ 442.0 $ 473.8  
Investment in finance leases (Note 16) 16.0 11.9  
Receivables from related parties (Note 17) 61.2 58.2  
Other receivables 114.1 101.7  
Total accounts receivable 612.0 624.7  
Gross carrying amount | Current trade receivables      
Disclosure of financial assets [line items]      
Accounts receivable 256.3 232.3  
Gross carrying amount | 1-30 days      
Disclosure of financial assets [line items]      
Accounts receivable 68.9 132.1  
Gross carrying amount | 31-60 days      
Disclosure of financial assets [line items]      
Accounts receivable 18.1 33.7  
Gross carrying amount | 61-90 days      
Disclosure of financial assets [line items]      
Accounts receivable 15.1 16.0  
Gross carrying amount | Greater than 90 days      
Disclosure of financial assets [line items]      
Accounts receivable 83.6 59.7  
Accumulated impairment      
Disclosure of financial assets [line items]      
Credit loss allowances (21.3) (20.9)  
Accumulated impairment | Accounts receivable      
Disclosure of financial assets [line items]      
Credit loss allowances $ (21.3) $ (20.9) $ (25.5)