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DISCONTINUED OPERATIONS - Other Comprehensive Income Statement (Details) - CAD ($)
$ in Millions
12 Months Ended
Feb. 16, 2024
Mar. 31, 2024
Mar. 31, 2023
Disclosure of analysis of single amount of discontinued operations [line items]      
Foreign currency exchange differences on translation of foreign operations   $ (4.7) $ 325.3
Reclassification to income of gains on foreign currency exchange differences   (1.6) (6.4)
Other comprehensive (loss) income from discontinued operations   (7.0) 5.8
Discontinued operations      
Disclosure of analysis of single amount of discontinued operations [line items]      
Foreign currency exchange differences on translation of foreign operations   0.9 5.8
Reclassification to income of gains on foreign currency exchange differences $ (2.5) (2.5) 0.0
Income taxes   $ 5.4 $ 0.0