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ACCOUNTS RECEIVABLE (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Disclosure of financial assets [line items]    
Accounts receivable $ 473.8 $ 479.3
Investment in finance leases (Note 15) 11.9 13.5
Receivables from related parties (Note 31) 58.2 57.5
Other receivables 101.7 90.9
Total accounts receivable 624.7 615.7
Gross carrying amount | Current trade receivables    
Disclosure of financial assets [line items]    
Accounts receivable 232.3 280.6
Gross carrying amount | 1-30 days    
Disclosure of financial assets [line items]    
Accounts receivable 132.1 68.4
Gross carrying amount | 31-60 days    
Disclosure of financial assets [line items]    
Accounts receivable 33.7 28.3
Gross carrying amount | 61-90 days    
Disclosure of financial assets [line items]    
Accounts receivable 16.0 16.8
Gross carrying amount | Greater than 90 days    
Disclosure of financial assets [line items]    
Accounts receivable 59.7 85.2
Accumulated impairment    
Disclosure of financial assets [line items]    
Credit loss allowances (20.9) (25.5)
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]    
Credit loss allowances, beginning of year (25.5)  
Credit loss allowances, end of year (20.9) (25.5)
Accumulated impairment | Accounts receivable    
Disclosure of financial assets [line items]    
Credit loss allowances (20.9) (25.5)
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]    
Credit loss allowances, beginning of year (25.5) (27.9)
Additions (8.3) 3.2
Amounts charged off 9.4 4.7
Unused amounts reversed 2.2 1.9
Disposal of discontinued operations (Note 2) 0.9 0.0
Foreign currency exchange differences 0.4 (1.0)
Credit loss allowances, end of year (20.9) (25.5)
Accumulated impairment | Civil Aviation    
Disclosure of financial assets [line items]    
Credit loss allowances (19.9) (23.1)
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]    
Credit loss allowances, beginning of year (23.1)  
Credit loss allowances, end of year (19.9) (23.1)
Accumulated impairment | Defense and Security    
Disclosure of financial assets [line items]    
Credit loss allowances (1.0) (1.0)
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]    
Credit loss allowances, beginning of year (1.0)  
Credit loss allowances, end of year $ (1.0) $ (1.0)