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PROVISIONS (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Reconciliation of changes in other provisions [abstract]    
Provisions at beginning of period $ 56.6  
Additions 63.7  
Business combinations (Note 2) 0.6  
Amount used (66.4)  
Reversal of unused amounts (6.7)  
Foreign currency exchange differences 1.3  
Transfers and others (0.3)  
Provisions at end of period 48.8  
Current portion 34.5 $ 42.6
Non-current portion 14.3 $ 14.0
Restoration and simulator removal    
Reconciliation of changes in other provisions [abstract]    
Provisions at beginning of period 9.7  
Additions 0.0  
Business combinations (Note 2) 0.6  
Amount used 0.0  
Reversal of unused amounts (0.1)  
Foreign currency exchange differences 0.7  
Transfers and others 0.1  
Provisions at end of period 11.0  
Current portion 0.0  
Non-current portion 11.0  
Restructuring    
Reconciliation of changes in other provisions [abstract]    
Provisions at beginning of period 15.3  
Additions 37.7  
Business combinations (Note 2) 0.0  
Amount used (40.4)  
Reversal of unused amounts (4.6)  
Foreign currency exchange differences (0.1)  
Transfers and others (0.3)  
Provisions at end of period 7.6  
Current portion 7.6  
Non-current portion 0.0  
Legal    
Reconciliation of changes in other provisions [abstract]    
Provisions at beginning of period 0.3  
Additions 4.6  
Business combinations (Note 2) 0.0  
Amount used 0.0  
Reversal of unused amounts 0.0  
Foreign currency exchange differences 0.1  
Transfers and others (0.4)  
Provisions at end of period 4.6  
Current portion 4.6  
Non-current portion 0.0  
Warranties    
Reconciliation of changes in other provisions [abstract]    
Provisions at beginning of period 14.6  
Additions 16.2  
Business combinations (Note 2) 0.0  
Amount used (15.4)  
Reversal of unused amounts 0.0  
Foreign currency exchange differences 0.0  
Transfers and others 0.0  
Provisions at end of period 15.4  
Current portion 12.6  
Non-current portion 2.8  
Onerous contracts and other    
Reconciliation of changes in other provisions [abstract]    
Provisions at beginning of period 16.7  
Additions 5.2  
Business combinations (Note 2) 0.0  
Amount used (10.6)  
Reversal of unused amounts (2.0)  
Foreign currency exchange differences 0.6  
Transfers and others 0.3  
Provisions at end of period 10.2  
Current portion 9.7  
Non-current portion $ 0.5