SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
	Jul. 01, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Significant Accounting Policies [Line Items]
Restricted cash		$ 43.7	$ 40.0
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member	us-gaap:AccountingStandardsUpdate201602Member	us-gaap:AccountingStandardsUpdate201409Member
Cumulative-effect adjustment		$ 3,228.8	$ 4,593.4	$ 8,855.2	$ 9,317.7
Total present value of lease liabilities		422.4
Operating lease right-of-use assets		$ 371.4
Sales returns, percentage		3.00%	2.00%	2.00%
Trade spending activities, percentage		11.00%	9.00%	10.00%
Advertising expense		$ 1,343.7	$ 1,595.5	$ 1,836.5
Depreciation and amortization		351.7	331.8	331.1
Research and development expense		93.4	98.5	108.1
Foreign earnings repatriated		4,600.0
Net gains (losses) from foreign currency exchange transactions		(30.5)	4.2	16.8
Cumulative Effect, Period of Adoption, Adjustment
Significant Accounting Policies [Line Items]
Cumulative-effect adjustment			(0.7)	(18.2)
Total present value of lease liabilities	$ 617.8
Operating lease right-of-use assets	551.3
Unamortized lease incentives and lease loss liabilities reclassified upon adoption of accounting standard	$ 66.4
Accumulated Deficit
Significant Accounting Policies [Line Items]
Cumulative-effect adjustment		(5,548.6)	(4,541.2)	(626.2)	$ (459.2)
Accumulated Deficit | Cumulative Effect, Period of Adoption, Adjustment
Significant Accounting Policies [Line Items]
Cumulative-effect adjustment			(0.7)	(18.2)
Operating Income (Loss)
Significant Accounting Policies [Line Items]
Net gains (losses) from foreign currency exchange transactions		18.0	2.7	5.2
Interest Expense, Net and Other Expense (Income), Net
Significant Accounting Policies [Line Items]
Net gains (losses) from foreign currency exchange transactions		$ (14.8)	7.6	8.5
Store fixtures | Minimum
Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful life		3 years
Store fixtures | Maximum
Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful life		5 years
Marketing furniture and fixtures
Significant Accounting Policies [Line Items]
Depreciation and amortization		$ 127.9	$ 120.4	$ 113.0
Marketing furniture and fixtures | Minimum
Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful life		3 years
Marketing furniture and fixtures | Maximum
Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful life		5 years