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SHARE CAPITAL, OPTION PLANS AND SHARE-BASED PAYMENTS - Summary of Outstanding Stock Options, Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (in shares) 8,972,754   8,972,754   7,429,537
Cash used to settle awards $ 0 $ 0 $ 0 $ 0  
Capitalized amount of share-based compensation costs 0 0 0 0  
Cash proceeds from exercise of options granted 8,300,000 23,400,000 23,800,000 34,800,000  
Tax benefit realized from exercise of options $ 300,000 $ 400,000 $ 1,400,000 $ 1,300,000  
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (in shares) 8,972,754   8,972,754    
Common shares available for issuance (in shares) 11,254,895   11,254,895    
Expiration period of options, minimum term     7 years    
Expiration period of options, maximum term     10 years    
Unrecognized compensation cost relating to unvested stock awards $ 41,600,000   $ 41,600,000    
Unvested stock awards compensation cost, weighted average recognition period     2 years 10 months 24 days    
Stock Options | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     4 years    
Stock Options | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     5 years