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SHARE CAPITAL, OPTION PLANS AND SHARE-BASED PAYMENTS - Summary of Outstanding Stock Options, Narrative (Details) - USD ($)
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options outstanding (in shares) 8,113,574 7,429,537  
Cash used to settle awards $ 0 $ 0 $ 0
Capitalized amount of share-based compensation costs 0 0 0
Aggregate intrinsic value of options exercised 25,000,000.0 26,600,000 21,000,000.0
Cash proceeds from exercise of options granted 49,600,000 41,300,000 35,600,000
Tax benefit realized from exercise of options $ 2,300,000 $ 1,900,000 $ 2,900,000
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options outstanding (in shares) 8,113,574    
Common shares available for issuance (in shares) 11,251,577    
Expiration period of options, minimum term 7 years    
Expiration period of options, maximum term 10 years    
Unrecognized compensation cost relating to unvested stock awards $ 38,700,000    
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