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LONG-TERM DEBT - Schedule of Long-Term Debt (Details) - USD ($)	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020
Debt Instrument [Line Items]
Total principal payments due	$ 3,620,000,000	$ 4,227,500,000
Debt issuance costs	(34,038,000)	(37,945,000)
Total amount outstanding	3,590,206,000	4,194,311,000
Less:
Current portion of long-term debt	10,000,000	610,000,000
Non-current portion of long-term debt	3,580,206,000	3,584,311,000
Senior Notes 2026
Debt Instrument [Line Items]
Premium on notes	4,244,000	4,756,000
Term Loan B
Debt Instrument [Line Items]
Total principal payments due	970,000,000	977,500,000
Less:
Current portion of long-term debt	10,000,000	10,000,000
Senior Notes \| Senior Notes 2030
Debt Instrument [Line Items]
Total principal payments due	900,000,000	900,000,000
Senior Notes \| Senior Notes 2028
Debt Instrument [Line Items]
Total principal payments due	900,000,000	900,000,000
Senior Notes \| Senior Notes 2026
Debt Instrument [Line Items]
Total principal payments due	850,000,000	850,000,000
Revolver \| Line of Credit
Debt Instrument [Line Items]
Total principal payments due	0	600,000,000	$ 600,000,000
Less:
Current portion of long-term debt	$ 0	$ 600,000,000