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FINANCIAL RISK MANAGEMENT - Credit Risk (Details) - CAD ($)
$ in Millions
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Disclosure of detailed information about financial instruments [line items]      
Gross accounts receivable $ 584.8    
Gross contract assets 642.4    
Total 1,227.2    
Credit loss allowances $ (27.9) $ (34.4) $ (27.5)
Expected credit loss rate (in percent) 2.30%    
Civil Aviation      
Disclosure of detailed information about financial instruments [line items]      
Gross accounts receivable $ 293.4    
Gross contract assets 137.2    
Total 430.6    
Credit loss allowances $ (25.7)    
Expected credit loss rate (in percent) 6.00%    
Defense and Security      
Disclosure of detailed information about financial instruments [line items]      
Gross accounts receivable $ 219.9    
Gross contract assets 500.9    
Total 720.8    
Credit loss allowances $ (0.8)    
Expected credit loss rate (in percent) 0.10%    
Healthcare      
Disclosure of detailed information about financial instruments [line items]      
Gross accounts receivable $ 53.2    
Gross contract assets 4.3    
Total 57.5    
Credit loss allowances $ (1.4)    
Expected credit loss rate (in percent) 2.40%    
Amounts not allocated to a segment      
Disclosure of detailed information about financial instruments [line items]      
Gross accounts receivable $ 18.3    
Gross contract assets 0.0    
Total 18.3    
Credit loss allowances $ 0.0    
Expected credit loss rate (in percent) 0.00%