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INVESTMENT IN EQUITY ACCOUNTED INVESTEES - Balances and transactions with joint ventures (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disclosure of joint ventures [line items]    
Accounts receivable (Note 11) $ 61.2 $ 58.2
Contract assets 521.0 579.2
Accounts payable and accrued liabilities (Note 19) 14.9 4.7
Contract liabilities 607.4 432.3
Total for all joint ventures    
Disclosure of joint ventures [line items]    
Accounts receivable (Note 11) 63.2 58.8
Contract assets 22.3 34.2
Other non-current assets 39.5 22.9
Accounts payable and accrued liabilities (Note 19) 14.9 4.7
Contract liabilities 57.5 64.9
Revenue 278.7 258.7
Purchases 1.4 6.0
Other income $ 2.4 $ 0.6