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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Jun. 30, 2019
Income Taxes [Line Items]          
Discrete tax expense (benefit) due to change in estimate of nondeductible expenses     $ (200)    
Effective income tax rate 53.10%   29.60%    
Gross unrecognized tax benefits $ 1,000   $ 1,000   $ 1,200
Unrecognized tax benefits that would impact effective tax rate if recognized 800   800    
Income tax penalties and interest accrued 1,100   1,100   $ 1,000
Income (loss) before income taxes 3,652 $ 15,795 $ 34,953 $ 61,670  
Administration of the Treasury, Belgium [Member]          
Income Taxes [Line Items]          
Income (loss) before income taxes $ 1,000 $ 800