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FINANCIAL RISK MANAGEMENT - Narrative (Details)
$ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2024
CAD ($)
shares
Mar. 31, 2023
CAD ($)
shares
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Disclosure of detailed information about financial instruments [line items]        
Line of credit facility, maximum borrowing capacity     $ 1,000.0 $ 1,000.0
Accounts receivable, maximum amount available to sell     $ 400.0 400.0
Accounts receivable, amount sold to financial institution $ 303.7 $ 266.7    
Accounts receivable, amount sold to financial institution, fees $ 44.9 42.4    
Strengthening in the relevant foreign currency against the Canadian dollar (in percent) 5.00%   5.00%  
Net (loss) income $ (296.3) 231.9    
Other comprehensive income from continuing operations $ (1.4) $ 257.0    
Equity swap agreement, common shares (in shares) | shares 2,400,000 2,700,000    
Letters of credit and guarantees, net $ 244.5 $ 242.5    
U.S. Federal Government        
Disclosure of detailed information about financial instruments [line items]        
Percentage of entity's revenue 21.00% 23.00%    
Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Sensitivity analysis to interest rate change (in percent) 1.00%      
Net (loss) income $ (7.2) $ (8.8)    
Other comprehensive income from continuing operations 0.0 0.0    
Currencies (sold/bought)        
Disclosure of detailed information about financial instruments [line items]        
Notional amount 2,916.5 $ 2,119.4    
Currencies (sold/bought) | United States of America, Dollars        
Disclosure of detailed information about financial instruments [line items]        
Notional amount $ 400.0      
Unsecured senior notes, term loans and revolving credit facility | Hedges of net investment in foreign operations [member]        
Disclosure of detailed information about financial instruments [line items]        
Long-term debt (lease liabilities), including current portion     $ 1,638.6 $ 1,054.8
Foreign currency and interest rate swap agreements        
Disclosure of detailed information about financial instruments [line items]        
Fixed interest rate (in percent) 93.00% 73.00% 93.00% 73.00%