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SHARE CAPITAL, OPTION PLANS AND SHARE-BASED PAYMENTS - Long-Term Incentive Plans (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Issuance of treasury stock (in shares) 23,640   0 509,721 255,502
Payments for repurchase of common stock $ 23,000,000.0   $ 0 $ 64,847,000 $ 12,424,000
Long Term Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Term of plan       3 years  
Compensation cost related to unvested awards not yet recognized $ 34,500,000     $ 34,500,000  
Unvested stock awards compensation cost, weighted average recognition period       1 year 10 months 24 days  
Issuance of treasury stock (in shares)   292,401      
Payments for repurchase of common stock   $ 11,200,000