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LEASES - Narrative (Details) - CAD ($)
$ in Millions
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disclosure of leases [Abstract]    
Depreciation $ 50.1 $ 48.4
Short-term lease, low-value assets, and variable lease payments expenses 16.8 15.4
Net book value of property, plant and equipment leased under operating lease to third parties $ 76.1 $ 51.8