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FINANCIAL RISK MANAGEMENT - Credit Risk (Details) - CAD ($)
$ in Millions
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Disclosure of detailed information about financial instruments [line items]      
Gross accounts receivable $ 641.2 $ 584.8  
Gross contract assets 735.7 642.4  
Total 1,376.9 1,227.2  
Credit loss allowances $ (25.5) $ (27.9) $ (34.4)
Expected credit loss rate (in percent) 1.90% 2.30%  
Civil Aviation      
Disclosure of detailed information about financial instruments [line items]      
Gross accounts receivable $ 354.1 $ 293.4  
Gross contract assets 160.6 137.2  
Total 514.7 430.6  
Credit loss allowances $ (23.1) $ (25.7)  
Expected credit loss rate (in percent) 4.50% 6.00%  
Defense and Security      
Disclosure of detailed information about financial instruments [line items]      
Gross accounts receivable $ 198.1 $ 219.9  
Gross contract assets 571.6 500.9  
Total 769.7 720.8  
Credit loss allowances $ (1.0) $ (0.8)  
Expected credit loss rate (in percent) 0.10% 0.10%  
Healthcare      
Disclosure of detailed information about financial instruments [line items]      
Gross accounts receivable $ 65.4 $ 53.2  
Gross contract assets 3.5 4.3  
Total 68.9 57.5  
Credit loss allowances $ (1.4) $ (1.4)  
Expected credit loss rate (in percent) 2.00% 2.40%  
Amounts not allocated to a segment      
Disclosure of detailed information about financial instruments [line items]      
Gross accounts receivable $ 23.6 $ 18.3  
Gross contract assets 0.0 0.0  
Total 23.6 18.3  
Credit loss allowances $ 0.0 $ 0.0  
Expected credit loss rate (in percent) 0.00% 0.00%