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PROVISIONS (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Reconciliation of changes in other provisions [abstract]    
Provisions at beginning of period $ 57.3  
Additions 16.1  
Amount used (27.9)  
Reversal of unused amounts (3.9)  
Foreign currency exchange differences 1.3  
Transfers and others 3.9  
Provisions at end of period 46.8  
Current portion 26.7 $ 36.7
Non-current portion 20.1 $ 20.6
Restoration and simulator removal    
Reconciliation of changes in other provisions [abstract]    
Provisions at beginning of period 9.4  
Additions 0.2  
Amount used 0.0  
Reversal of unused amounts (1.0)  
Foreign currency exchange differences 0.4  
Transfers and others 0.2  
Provisions at end of period 9.2  
Current portion 0.0  
Non-current portion 9.2  
Restructuring    
Reconciliation of changes in other provisions [abstract]    
Provisions at beginning of period 9.2  
Additions 4.3  
Amount used (10.8)  
Reversal of unused amounts (1.6)  
Foreign currency exchange differences 0.2  
Transfers and others (0.2)  
Provisions at end of period 1.1  
Current portion 1.1  
Non-current portion 0.0  
Legal    
Reconciliation of changes in other provisions [abstract]    
Provisions at beginning of period 8.0  
Additions 0.1  
Amount used (5.8)  
Reversal of unused amounts (0.6)  
Foreign currency exchange differences 0.1  
Transfers and others 0.0  
Provisions at end of period 1.8  
Current portion 1.5  
Non-current portion 0.3  
Warranties    
Reconciliation of changes in other provisions [abstract]    
Provisions at beginning of period 25.0  
Additions 9.8  
Amount used (11.3)  
Reversal of unused amounts (0.1)  
Foreign currency exchange differences 0.2  
Transfers and others 0.3  
Provisions at end of period 23.9  
Current portion 15.5  
Non-current portion 8.4  
Other    
Reconciliation of changes in other provisions [abstract]    
Provisions at beginning of period 5.7  
Additions 1.7  
Amount used 0.0  
Reversal of unused amounts (0.6)  
Foreign currency exchange differences 0.4  
Transfers and others 3.6  
Provisions at end of period 10.8  
Current portion 8.6  
Non-current portion $ 2.2