BUSINESS DESCRIPTION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Advertising, Interest Income and Other, Income Taxes and Foreign Currency Translation (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2019	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Advertising Expense
Corporate funded advertising costs		$ 7,015	$ 13,210	$ 21,581
Advertising fund contributions from company-owned salons		897	3,715	12,929
Advertising fund contributions from franchisees		22,023	13,341	34,073
Total advertising costs		29,935	30,266	68,583
Cooperative advertising income			14,900
Advertising funds, assets		9,900	4,300
Advertising funds, liabilities		9,900	4,300
Interest and Other Income [Abstract]
Proceeds from sale of company headquarters	$ 9,000	0	8,996	0
Gain from sale of company headquarters, net	$ 2,500	0	2,513	0
Income Taxes
Deferred tax assets, valuation allowance		192,522	122,447
Valuation allowance		34,400
Net tax expense, valuation allowance against NOLs			14,700
Additional valuation allowance		34,400	17,000
Foreign Currency Translation
Foreign currency gain (loss)		$ 300	(100)	$ 100
Capital loss carryforward
Income Taxes
Valuation allowance			$ 14,900