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PROVISIONS (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Reconciliation of changes in other provisions [abstract]    
Provisions at beginning of period $ 46.8  
Additions 50.8  
Amount used (33.1)  
Reversal of unused amounts (2.9)  
Disposal of discontinued operations (Note 2) (0.5)  
Foreign currency exchange differences 0.0  
Transfers and others (4.5)  
Provisions at end of period 56.6  
Current portion 42.6 $ 26.7
Non-current portion 14.0 $ 20.1
Restoration and simulator removal    
Reconciliation of changes in other provisions [abstract]    
Provisions at beginning of period 9.2  
Additions 0.2  
Amount used (0.1)  
Reversal of unused amounts 0.0  
Disposal of discontinued operations (Note 2) 0.0  
Foreign currency exchange differences 0.1  
Transfers and others 0.3  
Provisions at end of period 9.7  
Current portion 0.0  
Non-current portion 9.7  
Restructuring    
Reconciliation of changes in other provisions [abstract]    
Provisions at beginning of period 1.1  
Additions 27.7  
Amount used (13.5)  
Reversal of unused amounts (0.1)  
Disposal of discontinued operations (Note 2) 0.0  
Foreign currency exchange differences 0.0  
Transfers and others 0.1  
Provisions at end of period 15.3  
Current portion 15.3  
Non-current portion 0.0  
Legal    
Reconciliation of changes in other provisions [abstract]    
Provisions at beginning of period 1.8  
Additions 0.1  
Amount used (1.0)  
Reversal of unused amounts (0.6)  
Disposal of discontinued operations (Note 2) 0.0  
Foreign currency exchange differences 0.0  
Transfers and others 0.0  
Provisions at end of period 0.3  
Current portion 0.3  
Non-current portion 0.0  
Warranties    
Reconciliation of changes in other provisions [abstract]    
Provisions at beginning of period 23.9  
Additions 8.8  
Amount used (14.9)  
Reversal of unused amounts 0.0  
Disposal of discontinued operations (Note 2) (0.5)  
Foreign currency exchange differences 0.0  
Transfers and others (2.7)  
Provisions at end of period 14.6  
Current portion 11.1  
Non-current portion 3.5  
Onerous contracts and other    
Reconciliation of changes in other provisions [abstract]    
Provisions at beginning of period 10.8  
Additions 14.0  
Amount used (3.6)  
Reversal of unused amounts (2.2)  
Disposal of discontinued operations (Note 2) 0.0  
Foreign currency exchange differences (0.1)  
Transfers and others (2.2)  
Provisions at end of period 16.7  
Current portion 15.9  
Non-current portion $ 0.8