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SHARE CAPITAL, OPTION PLANS AND SHARE-BASED PAYMENTS - Summary of Outstanding Stock Options, Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (in shares) 9,549,296   9,549,296   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 6,900,000 6,800,000 15,500,000 11,400,000  
Tax benefit realized from exercise of options $ 400,000 $ 600,000 $ 1,100,000 $ 900,000  
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (in shares) 9,549,296   9,549,296    
Common shares available for issuance (in shares) 10,897,299   10,897,299    
Expiration period of options, minimum term     7 years    
Expiration period of options, maximum term     10 years    
Unrecognized compensation cost relating to unvested stock awards $ 45,000,000.0   $ 45,000,000.0    
Unvested stock awards compensation cost, weighted average recognition period     3 years    
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