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Debt and Borrowings (Narrative) (Details)
£ in Thousands, $ in Thousands
9 Months Ended
Mar. 31, 2016
GBP (£)
Mar. 31, 2016
USD ($)
Jun. 30, 2015
USD ($)
Line of Credit Facility [Line Items]      
Aggregate principal amount of senior notes   $ 150,000  
Senior notes term, in years 10    
Senior notes maturity date May 02, 2016    
Senior notes interest percentage 5.98% 5.98%  
Senior notes outstanding   $ 150,000 $ 150,000
Line Of Credit Potential Incremental Borrowing Capacity Post-Amendment   350,000  
Revolving credit facility expiration date Dec. 12, 2019    
Interest coverage ratio 4.0    
Leverage ratio 3.5    
Consolidated leverage ratio 4.0    
Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Revolving credit facility   1,000,000  
Borrowings outstanding under credit agreement   723,326  
Line of Credit Facility, Remaining Borrowing Capacity   $ 276,674  
Long-term Debt, Weighted Average Interest Rate 1.92% 1.92%  
Revolving Credit Facility [Member] | Minimum [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.20%    
Revolving Credit Facility [Member] | Maximum [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.30%    
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 borrowing arrangement [Member]      
Line of Credit Facility [Line Items]      
Revolving credit facility | £ £ 52,000    
Short-term Debt, Weighted Average Interest Rate 2.80% 2.80%  
Mona [Member]      
Line of Credit Facility [Line Items]      
Short-term Debt, Weighted Average Interest Rate 2.50% 2.50%