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L3HARRIS' MILITARY TRAINING BUSINESS - Narrative (Details)
$ / shares in Units, $ in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 04, 2021
CAD ($)
$ / shares
shares
Mar. 12, 2021
CAD ($)
Mar. 31, 2021
CAD ($)
Mar. 31, 2020
CAD ($)
Dec. 31, 2021
USD ($)
Mar. 31, 2021
USD ($)
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]            
Number of subscription receipts issued | shares 22,400,000          
Price per subscription receipt | $ / shares $ 31.25          
Aggregate gross proceeds $ 700.0   $ 700.0      
Commitment fee 4.00%          
Accrued commitment fee $ 14.0   14.0      
Income tax recovery $ 3.7          
Contingent consideration arising on business combinations     11.2 $ 0.0    
Share issue related cost   $ 42.3        
Share issue related cost, income tax recovery   $ 11.2        
Change in fair value of financial instruments, loss     (140.4) $ 71.0    
Other Issuance Related Costs, Recorded As A Deduction From Equity     3.0      
Other Issuance Related Costs, Recorded As A Deduction From Equity, Income Tax Recovery     0.8      
L3Harris' Military Training business            
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]            
Number of common shares issued upon conversion of subscription receipts 1          
Contingent consideration arising on business combinations     14.0      
Change in fair value of financial instruments, loss     $ 7.7      
L3Harris' Military Training business | Forecast            
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]            
Cash consideration         $ 1,050  
L3Harris' Military Training business | Currency risk            
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]            
Notional amount           $ 800