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ACCOUNTS RECEIVABLE (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disclosure of financial assets [line items]    
Accounts receivable $ 446.0 $ 402.4
Investment in finance leases (Note 15) 21.6 13.6
Receivables from related parties (Note 33) 40.3 29.4
Other receivables 76.9 107.6
Credit loss allowances (27.9) (34.4)
Total accounts receivable 556.9 518.6
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]    
Credit loss allowances, beginning of year (34.4) (27.5)
Additions (4.7) (15.7)
Amounts charged off 8.9 6.3
Unused amounts reversed 0.8 0.4
Foreign currency exchange differences 1.5 2.1
Credit loss allowances, end of year (27.9) (34.4)
Gross carrying amount | Current trade receivables    
Disclosure of financial assets [line items]    
Accounts receivable 230.4 180.3
Gross carrying amount | 1-30 days    
Disclosure of financial assets [line items]    
Accounts receivable 50.4 48.2
Gross carrying amount | 31-60 days    
Disclosure of financial assets [line items]    
Accounts receivable 29.0 22.6
Gross carrying amount | 61-90 days    
Disclosure of financial assets [line items]    
Accounts receivable 15.0 11.8
Gross carrying amount | Greater than 90 days    
Disclosure of financial assets [line items]    
Accounts receivable $ 121.2 $ 139.5