RELATED PARTY TRANSACTIONS (Details)		1 Months Ended		3 Months Ended		6 Months Ended
	Nov. 30, 2020	Dec. 31, 2020 USD ($) shares	Jul. 31, 2020	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($)	Nov. 16, 2020 shares	Jun. 30, 2020 shares
Related Party Transaction [Line Items]
Preferred stock, shares issued (in shares) | shares		1,500,000		1,500,000		1,500,000			1,500,000
Sublease income				$ 3,000,000.0	$ 2,400,000	$ 4,500,000	$ 4,600,000
Wella Business
Related Party Transaction [Line Items]
Equity securities, FV-NI, ownership percentage	40.00%
Wella Business | KKR
Related Party Transaction [Line Items]
Ownership percentage	60.00%
CEO
Related Party Transaction [Line Items]
Contribution agreement, percentage of total number of shares of common stock owed, to be transferred upon vesting			0.50
KKR | Closing of Convertible Preferred Stock
Related Party Transaction [Line Items]
Expenses						7,600,000
KKR | Consulting and Advisory Services
Related Party Transaction [Line Items]
Expenses						0
Wella Business
Related Party Transaction [Line Items]
Transition Services Agreement, term of agreement	18 months
Transition Services Agreement, term extension	3 months
Accounts receivable, related parties		$ 27,100,000		27,100,000		27,100,000
Accounts payable, related parties		101,300,000		101,300,000		$ 101,300,000
Sublease income				$ 1,400,000
Wella Business | Transition Services Agreement Fees
Related Party Transaction [Line Items]
Revenue from related parties		14,700,000
Wella Business | Related Party Transaction, Other Fees
Related Party Transaction [Line Items]
Revenue from related parties		$ 600,000
KKR
Related Party Transaction [Line Items]
Ownership percentage assuming full conversion of preferred stock									21.90%
HFS | KKR | Series B Preferred Stock
Related Party Transaction [Line Items]
Preferred stock, shares issued (in shares) | shares								146,057