TBG DISCONTINUED OPERATIONS AND RESTRUCTURING - Additional Information (Details) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2019 salon	Jun. 30, 2021 USD ($) salon	Jun. 30, 2019 USD ($)	Oct. 31, 2017 salon
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of stores		43
Number of stores transferred	207
Salon lease commitments | $		$ 9.0
Decrease in lease commitments | $		$ 14.0
TBG discontinued operations | Mall-Based Salons and International Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Promissory note receivable | $			$ 20.7
North America | Facility Closing
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of stores				858
United Kingdom | Facility Closing
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of stores				250