SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)	3 Months Ended	12 Months Ended
	Sep. 30, 2016 segment	Jun. 30, 2017 USD ($) segment	Jun. 30, 2017 USD ($) unit	Jun. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)
Significant Accounting Policies [Line Items]
Restricted cash		$ 35,300,000	$ 35,300,000	$ 35,300,000	$ 35,300,000	$ 0
Number of reporting units	4	3	3
Sales returns, percentage					2.00%	3.00%	3.00%
Trade spending activities, percentage					7.00%	8.00%	9.00%
Advertising expense				1,883,300,000		$ 967,600,000	$ 1,007,700,000
Depreciation and amortization				280,000,000		152,400,000	156,200,000
Research and development expense				139,200,000		47,700,000	47,400,000
Deferred financing fees		$ 67,600,000	$ 67,600,000	67,600,000	$ 67,600,000	64,600,000
Operating Income (Loss)
Significant Accounting Policies [Line Items]
Net losses (gains) from foreign currency exchange transactions				1,500,000		7,200,000	(7,900,000)
Interest Expense, Net and Other Expense (Income), Net
Significant Accounting Policies [Line Items]
Net losses (gains) from foreign currency exchange transactions				(12,800,000)		19,200,000	(4,100,000)
Other Expense, Net
Significant Accounting Policies [Line Items]
Net losses (gains) from foreign currency exchange transactions				(1,700,000)		(29,400,000)	0
Accounting Standards Update 2015-03 | Long-term Debt, Noncurrent
Significant Accounting Policies [Line Items]
Deferred financing fees						64,600,000
Accounting Standards Update 2015-03 | Other Noncurrent Assets
Significant Accounting Policies [Line Items]
Deferred financing fees						(64,600,000)
Marketing furniture and fixtures
Significant Accounting Policies [Line Items]
Depreciation and amortization				$ 107,400,000		$ 65,000,000	$ 69,800,000