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Short-Term Borrowings and Long-Term Debt (Schedule of Debt) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Debt Instrument [Line Items]    
Current portion of long-term debt $ 335 $ 551
Long-term debt 4,764 4,878
Borrowings under revolving credit facility 276,760 244,000
Total debt 281,859 249,429
Industrial Development Revenue Bond [Member]    
Debt Instrument [Line Items]    
Current portion of long-term debt 335 551
Long-term debt 4,764 4,878
Multi-Currency Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Borrowings under revolving credit facility $ 276,760 $ 244,000