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Debt and Borrowings (Narrative) (Details)
9 Months Ended
Dec. 12, 2014
USD ($)
Mar. 31, 2017
GBP (£)
Mar. 31, 2017
USD ($)
Mar. 31, 2017
EUR (€)
Jun. 30, 2016
USD ($)
Line of Credit Facility [Line Items]          
Line of credit potential incremental borrowing capacity post-amendment $ 350,000,000        
Revolving credit facility expiration date Dec. 12, 2019        
Interest coverage ratio 4.00        
Leverage ratio 3.50        
Consolidated leverage ratio 4.0        
Credit Agreement borrowings payable to banks [Member]          
Line of Credit Facility [Line Items]          
Revolving credit facility $ 1,000,000,000        
Long-term Line of Credit     $ 774,415,000   $ 827,860,000
Remaining borrowing capacity     $ 219,405,000    
Long-term debt, weighted average interest rate   2.24% 2.24% 2.24%  
Credit Agreement borrowings payable to banks [Member] | Minimum [Member]          
Line of Credit Facility [Line Items]          
Unused capacity, commitment fee, percentage 0.20%        
Credit Agreement borrowings payable to banks [Member] | Maximum [Member]          
Line of Credit Facility [Line Items]          
Unused capacity, commitment fee, percentage 0.30%        
Letter of Credit [Member]          
Line of Credit Facility [Line Items]          
Letters of credit outstanding     $ 6,180,000    
Eurocurrency Rate [Member] | Minimum [Member]          
Line of Credit Facility [Line Items]          
Debt instrument, basis spread on variable rate 0.875%        
Eurocurrency Rate [Member] | Maximum [Member]          
Line of Credit Facility [Line Items]          
Debt instrument, basis spread on variable rate 1.70%        
Base Rate [Member] | Minimum [Member]          
Line of Credit Facility [Line Items]          
Debt instrument, basis spread on variable rate 0.00%        
Base Rate [Member] | Maximum [Member]          
Line of Credit Facility [Line Items]          
Debt instrument, basis spread on variable rate 0.70%        
Tilda short-term borrowing arrangements [Member]          
Line of Credit Facility [Line Items]          
Revolving credit facility | £   £ 52,000,000      
Long-term Line of Credit     $ 8,225,000   $ 19,121,000
Debt instrument, term   6 months      
Short-term debt, weighted average interest rate   3.20% 3.20% 3.20%  
Mona [Member]          
Line of Credit Facility [Line Items]          
Revolving credit facility | €       € 12,500,000  
Short-term debt, weighted average interest rate   1.10% 1.10% 1.10%