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Share Capital, Option Plans and Share-Based Payments - Long-Term Incentive Plans (Details) - USD ($)
3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Issuance of treasury stock (in shares) 255,502 544,929 255,502 547,897
Payments for Repurchase of Common Stock $ 0 $ 12,800,000 $ 12,424,000 $ 24,534,000
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 $ 24,100,000   $ 24,100,000  
Unvested stock awards compensation cost, weighted average recognition period     2 years 1 month 6 days  
Fiscal 2019 LTIP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Issuance of treasury stock (in shares) 255,502      
Payments for Repurchase of Common Stock $ 9,100,000