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Short-Term Borrowings and Long-Term Debt (Narrative) (Details) - USD ($)
3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Aug. 08, 2017
Aug. 07, 2017
Apr. 03, 2017
Debt Instrument [Line Items]            
Debt issuance costs, net $ 1,200,000          
Industrial Development Revenue Bond [Member]            
Debt Instrument [Line Items]            
Percentage spread points on variable rate debt instrument 0.85%          
Maximum time period of interest (in years) 10 years          
Put option, exercisable period limitation 180 days          
Percentage of principal due on exercise of put option 100.00%          
Long-term debt, percentage bearing variable interest 2.97%   2.855%      
Multi-Currency Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Borrowing capacity under credit facility       $ 400,000,000 $ 300,000,000  
Debt issuance costs, gross       300,000   $ 900,000
Line of credit facility, unused capacity, commitment fee percentage 0.25%          
Percentage of capital stock or other equity interest pledged per credit agreement (up to) 65.00%          
Average daily balance on revolving credit facility $ 265,400,000 $ 218,500,000        
Line of credit facility, remaining borrowing capacity 123,200,000   $ 156,000,000      
Letters of credit outstanding $ 0   $ 0      
Multi-Currency Revolving Credit Facility [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Line of credit facility, unused capacity, commitment fee percentage 0.175%          
Multi-Currency Revolving Credit Facility [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Line of credit facility, unused capacity, commitment fee percentage 0.35%          
Multi-Currency Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Percentage spread points on variable rate debt instrument 1.625%          
Multi-Currency Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Percentage spread points on variable rate debt instrument 1.00%          
Multi-Currency Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Percentage spread points on variable rate debt instrument 2.125%          
Multi-Currency Revolving Credit Facility [Member] | Alternate Base Rate Loans [Member]            
Debt Instrument [Line Items]            
Percentage spread points on variable rate debt instrument 0.625%          
Multi-Currency Revolving Credit Facility [Member] | Alternate Base Rate Loans [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Percentage spread points on variable rate debt instrument 0.00%          
Multi-Currency Revolving Credit Facility [Member] | Alternate Base Rate Loans [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Percentage spread points on variable rate debt instrument 1.125%          
Letter of Credit [Member]            
Debt Instrument [Line Items]            
Borrowing capacity under credit facility       50,000,000    
Multi-Currency Revolving Credit Facility, Accordion Feature [Member]            
Debt Instrument [Line Items]            
Borrowing capacity under credit facility       200,000,000    
Multi-Currency Revolving Credit Facility, Combined with Accordion Feature [Member]            
Debt Instrument [Line Items]            
Borrowing capacity under credit facility       $ 600,000,000