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SHARE CAPITAL, OPTION PLANS AND SHARE-BASED PAYMENTS - RSUs, DSUs and ESPP (Details) - USD ($)
3 Months Ended 6 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Restricted Share Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options granted (in shares) 0 0 0 484,956
Award vesting period     3 years  
Unrecognized compensation cost relating to unvested stock awards $ 5,000,000   $ 5,000,000  
Unvested stock awards compensation cost, weighted average recognition period     1 year 3 months 18 days  
Stock issued (in shares) 0   141,452  
Stock issued $ 0 $ 0 $ 5,900,000 $ 0
Deferred Share Units (DSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options granted (in shares) 68,312 72,903 73,647 76,570
Stock issued (in shares) 0 0 0 0
Employee Share Purchase Plan (ESPP)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards purchase price discount     15.00%  
Common shares eligible for issuance (in shares) 172,782 166,635 398,513 367,407
Cash received from employee stock purchase plan $ 7,000,000 $ 6,500,000 $ 16,400,000 $ 13,700,000