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SHARE CAPITAL, OPTION PLANS AND SHARE-BASED PAYMENTS - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (in shares) 8,212,360   8,212,360   8,113,574
Cash used to settle awards $ 0 $ 0 $ 0 $ 0  
Capitalized amount of share-based compensation costs 0 0 0 0  
Aggregate intrinsic value of options exercised 900,000 2,500,000 16,300,000 7,700,000  
Cash proceeds from exercise of options granted 2,000,000 6,900,000 29,300,000 15,500,000  
Tax benefit realized from exercise of options $ 200,000 $ 400,000 $ 1,500,000 $ 1,100,000  
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (in shares) 8,212,360   8,212,360    
Common shares available for issuance (in shares) 10,300,222   10,300,222    
Expiration period of options, minimum term     7 years    
Expiration period of options, maximum term     10 years    
Unrecognized compensation cost relating to unvested stock awards $ 40,800,000   $ 40,800,000    
Unvested stock awards compensation cost, weighted average recognition period     2 years 9 months 18 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