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Short-Term Borrowings and Long-Term Debt (Narrative) (Details)
12 Months Ended
Jun. 30, 2017
USD ($)
quarter
Jun. 30, 2016
USD ($)
Aug. 08, 2017
USD ($)
Jun. 30, 2017
EUR (€)
Apr. 03, 2017
USD ($)
Jun. 30, 2016
EUR (€)
Net debt issuance costs of credit facility and bonds $ 1,300,000          
Industrial Development Revenue Bond [Member]            
Percentage spread points on variable rate debt instrument 0.85%          
Maximum time period of interest (in years) 10 years          
Debt instrument, exercisable option limitation, period 180 days          
Debt instrument, anniversary, options exercisable, period 5 years          
Debt instrument, redemption price, percentage 100.00%          
Variable interest rate of debt 1.926% 1.32%   1.926%   1.32%
Multi-Currency Revolving Credit Facility [Member]            
Borrowing capacity under credit facility $ 300,000,000          
Debt issuance costs of credit facility         $ 900,000  
Debt instrument, covenant requirement, leverage ratio, EBITDA, number of quarters in measurement period | quarter 4          
Line of credit facility, unused capacity, commitment fee percentage 0.20%          
Percentage of capital stock or other equity interest pledged per credit agreement 65.00%     65.00%    
Average daily balance on revolving credit facility $ 126,500,000 $ 86,600,000        
Amount available for additional borrowings $ 208,100,000 $ 228,200,000        
Letters of credit outstanding | €       € 0   € 400,000
Multi-Currency Revolving Credit Facility [Member] | Minimum [Member]            
Line of credit facility, unused capacity, commitment fee percentage 0.175%          
Multi-Currency Revolving Credit Facility [Member] | Maximum [Member]            
Line of credit facility, unused capacity, commitment fee percentage 0.35%          
London Interbank Offered Rate (LIBOR) [Member] | Multi-Currency Revolving Credit Facility [Member]            
Percentage spread points on variable rate debt instrument 1.375%          
London Interbank Offered Rate (LIBOR) [Member] | Multi-Currency Revolving Credit Facility [Member] | Minimum [Member]            
Percentage spread points on variable rate debt instrument 1.00%          
London Interbank Offered Rate (LIBOR) [Member] | Multi-Currency Revolving Credit Facility [Member] | Maximum [Member]            
Percentage spread points on variable rate debt instrument 2.125%          
Alternate Base Rate Loans [Member] | Multi-Currency Revolving Credit Facility [Member]            
Percentage spread points on variable rate debt instrument 0.375%          
Alternate Base Rate Loans [Member] | Multi-Currency Revolving Credit Facility [Member] | Minimum [Member]            
Percentage spread points on variable rate debt instrument 0.00%          
Alternate Base Rate Loans [Member] | Multi-Currency Revolving Credit Facility [Member] | Maximum [Member]            
Percentage spread points on variable rate debt instrument 1.125%          
Subsequent Event [Member] | Multi-Currency Revolving Credit Facility, Amended Credit Agreement [Member]            
Borrowing capacity under credit facility     $ 400,000,000      
Subsequent Event [Member] | Letter of Credit [Member]            
Borrowing capacity under credit facility     50,000,000      
Subsequent Event [Member] | Multi-Currency Revolving Credit Facility, Accordion Feature [Member]            
Borrowing capacity under credit facility     200,000,000      
Subsequent Event [Member] | Multi-Currency Revolving Credit Facility, Combined with Accordion Feature [Member]            
Borrowing capacity under credit facility     $ 600,000,000