Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Jun. 30, 2017
Debt Instrument [Line Items]
Total debt	$ 2,793,240	$ 2,597,120
Premium on Senior Notes 2026	6,311	6,597
Debt issuance costs	(31,082)	(33,900)
Total amount outstanding	2,768,469	2,569,817
Less:
Current portion of long-term debt	382,760	182,760
Non-current portion of long-term debt	2,385,709	2,387,057
Term Loan B
Debt Instrument [Line Items]
Total debt	768,240	772,120
Less:
Current portion of long-term debt	7,760	7,760
Senior Notes | Senior Notes 2026
Debt Instrument [Line Items]
Total debt	850,000	850,000
Senior Notes | Senior Notes 2023
Debt Instrument [Line Items]
Total debt	800,000	800,000
Line of Credit | Revolver
Debt Instrument [Line Items]
Total debt	375,000	175,000
Less:
Current portion of long-term debt	$ 375,000	$ 175,000