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SHARE CAPITAL, OPTION PLANS AND SHARE-BASED PAYMENTS - Summary of Outstanding Stock Options, Narrative (Details) - USD ($)
3 Months Ended
Sep. 14, 2020
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options outstanding (in shares)   9,695,850   7,429,537
Cash used to settle awards   $ 0 $ 0  
Capitalized amount of share-based compensation costs   0 0  
Cash proceeds from exercise of options granted   8,600,000 4,600,000  
Tax benefit realized from exercise of options   $ 700,000 $ 300,000  
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Additional shares authorized for issuance (in shares) 6,000,000      
Options outstanding (in shares)   9,695,850    
Common shares available for issuance (in shares)   10,963,914    
Expiration period of options, minimum term   7 years    
Expiration period of options, maximum term   10 years    
Unrecognized compensation cost relating to unvested stock awards   $ 48,200,000    
Unvested stock awards compensation cost, weighted average recognition period   3 years 1 month 6 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