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Income Taxes (Summary of Discrete Items on the Income Tax Rate) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Line Items]        
Income before income taxes $ 20,310 $ 35,781 $ 27,090 $ 58,505
Federal statutory income tax rate (percent) 28.00%   29.80%  
Accrued income tax expense, before discrete items $ 5,681   $ 8,074  
Discrete tax expense (benefit):        
Transition tax on repatriation of foreign earnings 9,300   9,300  
Other (30)   210  
Total net discrete tax expense 6,660   6,900  
Provision for income taxes $ 12,341 $ 12,745 $ 14,974 $ 20,653
Effective income tax rate 60.80%   55.30%  
Income tax rate effect of discrete items 32.80%   25.50%  
Income tax benefit due to change in rate $ 1,600   $ 1,600  
Internal Revenue Service (IRS) [Member]        
Discrete tax expense (benefit):        
Revaluation of deferred taxes (3,510)   (3,510)  
Administration of the Treasury, Belgium [Member]        
Income Taxes [Line Items]        
Income before income taxes (1,700)   (800)  
Discrete tax expense (benefit):        
Revaluation of deferred taxes $ 900   $ 900