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Income Taxes (Summary of Discrete Items on the Income Tax Rate) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Income Taxes [Line Items]        
Income before income taxes $ 15,792 $ 19,571 $ 42,883 $ 78,075
Federal statutory income tax rate (percent) 31.40%   30.40%  
Accrued income tax expense, before discrete items $ 4,963   $ 13,038  
Discrete tax expense (benefit):        
Transition tax on repatriation of foreign earnings 0   9,300  
Other 180   390  
Total net discrete tax expense 180   7,080  
Provision for income taxes $ 5,143 $ 7,147 $ 20,118 $ 27,799
Effective income tax rate 32.60%   46.90%  
Income tax rate effect of discrete items 1.10%   16.50%  
Income tax benefit due to change in rate $ 1,300   $ 2,900  
Internal Revenue Service (IRS) [Member]        
Discrete tax expense (benefit):        
Revaluation of deferred taxes 0   (3,510)  
Administration of the Treasury, Belgium [Member]        
Income Taxes [Line Items]        
Income before income taxes (1,500)   (3,200)  
Discrete tax expense (benefit):        
Revaluation of deferred taxes $ 0   $ 900