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LEASES - Narrative (Details) - CAD ($)
$ in Millions
12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Disclosure of leases [Abstract]    
Depreciation $ 53.5 $ 50.1
Short-term lease, low-value assets, and variable lease payments expenses 16.4 16.7
Net book value of property, plant and equipment leased under operating lease to third parties $ 130.4 $ 76.1