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FINANCIAL RISK MANAGEMENT - Credit Risk (Details) - CAD ($)
$ in Millions
Mar. 31, 2025
Mar. 31, 2024
Disclosure of detailed information about financial instruments [line items]    
Gross accounts receivable $ 633.3 $ 645.4
Gross contract assets 521.0 579.2
Total $ 1,154.3 $ 1,224.6
Expected credit loss rate (in percent) 1.80% 1.70%
Accumulated impairment    
Disclosure of detailed information about financial instruments [line items]    
Credit loss allowances $ (21.3) $ (20.9)
Civil Aviation    
Disclosure of detailed information about financial instruments [line items]    
Gross accounts receivable 384.8 347.1
Gross contract assets 163.2 177.3
Total $ 548.0 $ 524.4
Expected credit loss rate (in percent) 3.50% 3.80%
Civil Aviation | Accumulated impairment    
Disclosure of detailed information about financial instruments [line items]    
Credit loss allowances $ (19.3) $ (19.9)
Defense and Security    
Disclosure of detailed information about financial instruments [line items]    
Gross accounts receivable 211.8 258.2
Gross contract assets 357.8 401.9
Total $ 569.6 $ 660.1
Expected credit loss rate (in percent) 0.40% 0.20%
Defense and Security | Accumulated impairment    
Disclosure of detailed information about financial instruments [line items]    
Credit loss allowances $ (2.0) $ (1.0)
Amounts not allocated to a segment    
Disclosure of detailed information about financial instruments [line items]    
Gross accounts receivable 36.7 40.1
Gross contract assets 0.0 0.0
Total $ 36.7 $ 40.1
Expected credit loss rate (in percent) 0.00% 0.00%
Amounts not allocated to a segment | Accumulated impairment    
Disclosure of detailed information about financial instruments [line items]    
Credit loss allowances $ 0.0 $ 0.0