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ACCOUNTS RECEIVABLE (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disclosure of financial assets [line items]    
Accounts receivable $ 402.5 $ 478.0
Investment in finance leases (Note 17) 13.6 16.8
Receivables from related parties 29.4 45.8
Other receivables 107.5 53.0
Credit loss allowances (34.4) (27.5)
Total accounts receivable 518.6 566.1
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]    
Credit loss allowances, beginning of year (27.5) (22.0)
Additions (15.7) (7.4)
Amounts charged off 6.3 0.8
Unused amounts reversed 0.4 1.8
Foreign currency exchange differences 2.1 (0.7)
Credit loss allowances, end of year (34.4) (27.5)
Gross carrying amount | Current    
Disclosure of financial assets [line items]    
Accounts receivable 180.3 215.1
Gross carrying amount | 1-30 days    
Disclosure of financial assets [line items]    
Accounts receivable 48.2 95.7
Gross carrying amount | 31-60 days    
Disclosure of financial assets [line items]    
Accounts receivable 22.7 27.8
Gross carrying amount | 61-90 days    
Disclosure of financial assets [line items]    
Accounts receivable 11.8 34.1
Gross carrying amount | Greater than 90 days    
Disclosure of financial assets [line items]    
Accounts receivable $ 139.5 $ 105.3