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Long-term Debt (Detail Textuals) - USD ($)
$ in Thousands
 9 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Jun. 30, 2015
Debt Instrument [Line Items]      
Proceeds from borrowings under bank credit facilities $ 844,000 $ 294,633  
Outstanding amount under Credit Facility 1,503,324   $ 1,074,297
Unamortized debt issuance expense [1] 17,922   10,733
Principal Payment Through 30 June, 2018      
Debt Instrument [Line Items]      
Term loan principal payment 13,500    
Principal Payment Thereafter 30 June, 2018      
Debt Instrument [Line Items]      
Term loan principal payment 27,000    
Bank Credit Facility      
Debt Instrument [Line Items]      
Credit facility maximum borrowing capacity $ 1,981,300    
Credit facility borrowing capacity, description At any time and so long as no default has occurred, the Company has the right to increase the Revolving Facility or the Term Loan in an aggregate principal amount of up to the greater of $400.0 million or an amount subject to 2.75 times senior secured leverage, calculated assuming the Revolving Facility is fully drawn, with applicable lender approvals.    
Outstanding borrowings interest rate 3.00%    
Debt issuance cost $ 18,700    
Bank Credit Facility | Long-term Debt      
Debt Instrument [Line Items]      
Unamortized debt issuance expense 17,900    
Revolving Credit Facility      
Debt Instrument [Line Items]      
Credit facility maximum borrowing capacity 850,000    
Proceeds from borrowings under bank credit facilities 250,000    
Outstanding amount under Credit Facility 457,000   295,000
Same-Day Swing Line Loan Revolving Credit Sub Facility      
Debt Instrument [Line Items]      
Credit facility maximum borrowing capacity 100,000    
Stand-By Letters Of Credit Revolving Credit Sub Facility      
Debt Instrument [Line Items]      
Credit facility maximum borrowing capacity 25,000    
Outstanding Letters of Credit 400    
Term Loan      
Debt Instrument [Line Items]      
Credit facility maximum borrowing capacity 1,131,300    
Proceeds from term loan borrowings $ 300,000    
Term loan period 5 years    
Term loan frequency of payment quarterly    
Outstanding amount under Credit Facility $ 1,046,324   $ 779,297
[1] Balance as of June 30, 2015 has been adjusted for the reclassification of debt issuance costs related to the adoption of ASU 2015-03. See Note 2 for additional information.