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INTANGIBLE ASSETS - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disclosure of detailed information about intangible assets [line items]    
Increase in discount rate (in percent) 1.00%  
Decrease in growth rate (in percent) 1.00%  
Civil Aviation, Defense and Security and Healthcare    
Disclosure of detailed information about intangible assets [line items]    
Growth rate used to extrapolate cash flow projections (in years) 5 years  
Bottom of range    
Disclosure of detailed information about intangible assets [line items]    
Discount rate (in percent) 8.00%  
Bottom of range | Civil Aviation, Defense and Security and Healthcare    
Disclosure of detailed information about intangible assets [line items]    
Estimated growth rate (in percent) 2.00%  
Top of range    
Disclosure of detailed information about intangible assets [line items]    
Discount rate (in percent) 15.00%  
Top of range | Civil Aviation, Defense and Security and Healthcare    
Disclosure of detailed information about intangible assets [line items]    
Estimated growth rate (in percent) 3.00%  
Cost of sales    
Disclosure of detailed information about intangible assets [line items]    
Amortization $ 92.9 $ 77.2
Research and development expenses    
Disclosure of detailed information about intangible assets [line items]    
Amortization 29.0 30.6
Selling, general and administrative expenses    
Disclosure of detailed information about intangible assets [line items]    
Amortization $ 1.0 $ 1.7