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Debt And Borrowings (Narrative) (Details)
3 Months Ended
Feb. 06, 2018
USD ($)
Dec. 12, 2014
USD ($)
Sep. 30, 2018
GBP (£)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Tilda [Member] | Line of Credit [Member]          
Line of Credit Facility [Line Items]          
Revolving credit facility | £     £ 52,000,000    
Debt term     6 months    
Short-term debt, weighted average interest rate     4.17% 4.17%  
Tilda short-term borrowing arrangements       $ 11,928,000 $ 9,338,000
Unsecured revolving credit facility [Member] | Credit Agreement [Member]          
Line of Credit Facility [Line Items]          
Revolving credit facility   $ 1,000,000,000      
Interest coverage ratio, less than   4.00      
Leverage ratio   3.50      
Consolidated leverage ratio   4.0      
Line of Credit [Member] | Amended Credit Agreement [Member]          
Line of Credit Facility [Line Items]          
Revolving credit facility $ 300,000        
Additional borrowing capacity 400,000        
Available borrowing capacity       $ 580,186,000  
Weighted average interest rate     3.84% 3.84%  
Periodic payment $ 3,750,000        
Line of Credit [Member] | Amended Credit Agreement [Member] | Minimum [Member]          
Line of Credit Facility [Line Items]          
Commitment fee percentage     0.20%    
Line of Credit [Member] | Amended Credit Agreement [Member] | Maximum [Member]          
Line of Credit Facility [Line Items]          
Commitment fee percentage     0.30%    
Line of Credit [Member] | Amended Credit Agreement [Member] | Eurocurrency Rate [Member] | Minimum [Member]          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     0.875%    
Line of Credit [Member] | Amended Credit Agreement [Member] | Eurocurrency Rate [Member] | Maximum [Member]          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     1.70%    
Line of Credit [Member] | Amended Credit Agreement [Member] | Base Rate [Member] | Minimum [Member]          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     0.00%    
Line of Credit [Member] | Amended Credit Agreement [Member] | Base Rate [Member] | Maximum [Member]          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     0.70%    
Line of Credit [Member] | Term Loan [Member]          
Line of Credit Facility [Line Items]          
Line of credit facility outstanding       $ 292,500,000 $ 296,250,000
Letter of credit [Member] | Amended Credit Agreement [Member]          
Line of Credit Facility [Line Items]          
Borrowings outstanding under credit agreement       $ 8,157,000