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SUPPLEMENTARY CASH FLOWS INFORMATION (Details) - CAD ($)
$ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Cash Flow Statement [Abstract]    
Accounts receivable $ 76.4 $ (10.7)
Contract assets 77.1 153.0
Inventories (11.0) (76.3)
Prepayments (10.2) (11.2)
Income taxes (53.8) 30.2
Accounts payable and accrued liabilities 54.1 11.0
Provisions (9.7) 14.2
Contract liabilities 74.2 17.9
Increase (decrease) in working capital 197.1 128.1
Interest paid 201.7 189.7
Interest received 20.9 17.1
Income taxes paid $ 101.4 $ 69.7