Long-term Debt (Detail Textuals) - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2015	Jun. 30, 2015
Debt Instrument [Line Items]
Outstanding amount under Credit Facility	$ 999,814	$ 1,074,297
Unamortized debt issuance expense	5,358	5,997
Principal Payment Through 30 June, 2018
Debt Instrument [Line Items]
Term loan principal payment	9,700
Principal Payment Thereafter 30 June, 2018
Debt Instrument [Line Items]
Term loan principal payment	19,500
Bank Credit Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 1,681,300
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	2.90%
Debt issuance cost capitalized	$ 11,300
Bank Credit Facility | Long-term Debt
Debt Instrument [Line Items]
Unamortized debt issuance expense	5,400
Bank Credit Facility | Other long-term assets
Debt Instrument [Line Items]
Unamortized debt issuance expense	4,200
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	850,000
Outstanding amount under Credit Facility	240,000	295,000
Same-Day Swing Line Loan Revolving Credit Sub Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	75,000
Stand-By Letters Of Credit Revolving Credit Sub Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	25,000
Outstanding Letters of Credit	400,000
Term Loan
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 831,300
Term loan period	5 years
Term loan frequency of payment	quarterly
Outstanding amount under Credit Facility	$ 759,814	$ 779,297