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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, 2020
Dec. 31, 2019
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Issuance of treasury stock (in shares) 0   61,794 255,502 609,691
Payments for Repurchase of Common Stock $ 0   $ 2,000,000.0 $ 12,424,000 $ 26,499,000
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 $ 21,700,000     $ 21,700,000  
Unvested stock awards compensation cost, weighted average recognition period       1 year 10 months 24 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