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Short-Term Borrowings and Long-Term Debt (Narrative) (Details) - USD ($)
3 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Aug. 08, 2017
Aug. 07, 2017
Jun. 30, 2017
Debt Instrument [Line Items]          
Debt issuance costs, net $ 1,600,000        
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 2.081%       1.926%
Multi-Currency Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Borrowing capacity under credit facility     $ 400,000,000 $ 300,000,000  
Line of credit facility, unused capacity, commitment fee percentage 0.175%        
Percentage of capital stock or other equity interest pledged per credit agreement (up to) 65.00%        
Average daily balance on revolving credit facility $ 218,500,000 $ 102,300,000      
Line of credit facility, remaining borrowing capacity 119,700,000       $ 208,100,000
Letters of credit outstanding $ 0       $ 0
Debt issuance costs, gross     300,000    
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 1.125%        
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 0.125%        
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