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SHARE CAPITAL, EARNINGS PER SHARE AND DIVIDENDS - Narrative (Details) - CAD ($)
$ in Millions
12 Months Ended
Jul. 02, 2021
Mar. 31, 2023
Mar. 31, 2022
Share Capital, Reserves And Other Equity Interest [Abstract]      
Number of shares issued and fully paid (in shares)   317,906,290 317,024,123
Number of subscription receipts issued (in shares) 22,400,000    
Aggregate gross proceeds $ 700.0    
Earned interest 0.4    
Issuance related costs 31.0    
Income tax recovery $ 8.2    
Common shares (in shares)   2,176,800 663,430