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SHARE CAPITAL, OPTION PLANS AND SHARE-BASED PAYMENTS - RSUs, DSUs and ESPP (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Restricted Share Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options granted (in shares) 2,459,929 0 2,459,929 484,956
Award vesting period     3 years  
Unrecognized compensation cost relating to unvested stock awards $ 106,900,000   $ 106,900,000  
Unvested stock awards compensation cost, weighted average recognition period     2 years 1 month 6 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) 5,058 5,015 78,705 81,585
Stock issued (in shares) 0 23,640 0 23,640
Stock issued   $ 1,100,000   $ 1,100,000
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) 246,473 204,812 644,986 572,219
Cash received from employee stock purchase plan $ 8,900,000 $ 8,300,000 $ 25,300,000 $ 22,000,000