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DISCONTINUED OPERATIONS - Income statement (Details) - CAD ($)
$ in Millions
 12 Months Ended
Feb. 16, 2024
Mar. 31, 2025
Mar. 31, 2024
Disclosure of analysis of single amount of discontinued operations [line items]      
Revenue   $ 4,707.9 $ 4,282.8
Operating income (loss)   729.2 (185.4)
Finance expense   215.5 205.0
Earnings (loss) before income taxes   513.7 (390.4)
Income tax recovery   0.0 (9.4)
Net income from discontinued operations before after-tax gain on disposal   0.0 4.8
After-tax gain on disposal of discontinued operations   0.0 16.5
Net income from discontinued operations   0.0 21.3
Discontinued operations      
Disclosure of analysis of single amount of discontinued operations [line items]      
Revenue   0.0 131.7
Expenses   0.0 132.7
Operating income (loss)   0.0 (1.0)
Finance expense   0.0 3.6
Earnings (loss) before income taxes   $ 0.0 $ (4.6)
After-tax gain on disposal of discontinued operations $ 16.5