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SHARE CAPITAL, OPTION PLANS AND SHARE-BASED PAYMENTS - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (in shares) 9,009,585   9,009,585   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 400,000 2,100,000 16,700,000 9,800,000  
Cash proceeds from exercise of options granted 1,900,000 8,300,000 31,100,000 23,800,000  
Tax benefit realized from exercise of options $ 100,000 $ 300,000 $ 1,600,000 $ 1,400,000  
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (in shares) 9,009,585   9,009,585    
Common shares available for issuance (in shares) 9,450,921   9,450,921    
Expiration period of options, minimum term     7 years    
Expiration period of options, maximum term     10 years    
Unrecognized compensation cost relating to unvested stock awards $ 44,200,000   $ 44,200,000    
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