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Income Taxes (Reconciliation of U.S.Federal Income Tax Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Income Tax Contingency [Line Items]      
U.S. statutory rate 28.00% 35.00% 35.00%
U.S. Federal income tax at statutory rate $ 17,094 $ 35,524 $ 33,603
State and local income taxes, net of Federal benefit 1,883 1,729 1,578
Tax credits (1,825) (1,430) (2,517)
Valuation allowance 1,530 444 541
Effect of foreign operations, net (1,396) (1,477) (1,150)
Stock compensation 1,049 (61) (62)
Capitalized acquisition costs 48 231 70
Nontaxable income (9) (4,437) 0
Disallowed interest 1,888 2,011 571
Other (1,438) (285) (243)
U.S. Tax Reform transition tax   0 0
Provision for income taxes 27,772 32,249 32,391
Internal Revenue Service (IRS) [Member]      
Income Tax Contingency [Line Items]      
U.S. Tax Reform transition tax 9,609    
Impact of rate change on deferred taxes (1,615) 0 0
Administration of the Treasury, Belgium [Member]      
Income Tax Contingency [Line Items]      
Impact of rate change on deferred taxes 1,040 0 0
Other Jurisdiction [Member]      
Income Tax Contingency [Line Items]      
Impact of rate change on deferred taxes $ (86) $ 0 $ 0