SEGMENT INFORMATION - Financial Information by Reportable Operating Segment (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2019	Mar. 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Revenues:
Franchise rental income											$ 127,203
Total revenue	$ 60,143	$ 153,783	$ 208,765	$ 247,038	$ 248,190	$ 258,343	$ 274,671	$ 287,835			669,729	$ 1,069,039	$ 1,235,479
Operating expenses:
Site operating expenses											71,543	141,031	154,067
General and administrative											130,953	177,004	174,045
Rent		18,665								$ 63,424
Depreciation and amortization											36,952	37,848	58,205
Long-lived asset impairment											22,560	0	0
TBG restructuring						20,700					2,333	21,816	0
Goodwill impairment		40,164								40,164	40,164	0	0
Total operating expenses											815,067	1,091,158	1,240,618
Operating income (loss)	$ (68,567)	(59,399)	(7,466)	$ (9,906)	$ (1,835)	$ (22,162)	$ (1,551)	$ 3,429		(76,771)	(145,338)	(22,119)	(5,139)
Other (expense) income:
Interest expense											(7,522)	(4,795)	(10,492)
Gain from sale of salon assets to franchisees, net		(7,858)	(12,407)						$ (18,267)	(26,125)	(27,306)	2,918	241
Interest income and other, net		$ 148	$ 2,869						$ 3,040	$ 3,188	3,353	1,729	5,199
Income (loss) from continuing operations before income taxes											(176,813)	(22,267)	(10,191)
Non Franchise Lease
Operating expenses:
Rent											76,382	131,816	183,096
Franchisor
Operating expenses:
Rent											127,203
Franchise
Operating expenses:
Goodwill impairment											0
Company-owned
Operating expenses:
Goodwill impairment											40,164
Operating Segments | Franchise
Revenues:
Franchise rental income											127,203
Total revenue											253,026	153,666	131,097
Operating expenses:
Site operating expenses											13,341	34,099	26,818
General and administrative											33,725	32,888	25,880
Depreciation and amortization											922	762	365
Long-lived asset impairment											1,712
TBG restructuring											2,333	21,816
Goodwill impairment											0
Total operating expenses											220,140	137,524	95,460
Operating income (loss)											32,886	16,142	35,637
Other (expense) income:
Interest expense											0	0	0
Gain from sale of salon assets to franchisees, net											0	0	0
Interest income and other, net											0	0	0
Income (loss) from continuing operations before income taxes											32,886	16,142	35,637
Operating Segments | Franchise | Non Franchise Lease
Operating expenses:
Rent											872	740	269
Operating Segments | Franchise | Franchisor
Operating expenses:
Rent											127,203
Operating Segments | Company-owned
Revenues:
Franchise rental income											0
Total revenue											416,703	915,373	1,104,382
Operating expenses:
Site operating expenses											58,202	106,932	127,249
General and administrative											24,638	57,219	67,163
Depreciation and amortization											29,113	28,263	48,508
Long-lived asset impairment											20,848
TBG restructuring											0	0
Goodwill impairment											40,164
Total operating expenses											512,831	857,052	1,053,866
Operating income (loss)											(96,128)	58,321	50,516
Other (expense) income:
Interest expense											0	0	0
Gain from sale of salon assets to franchisees, net											0	0	0
Interest income and other, net											0	0	0
Income (loss) from continuing operations before income taxes											(96,128)	58,321	50,516
Operating Segments | Company-owned | Non Franchise Lease
Operating expenses:
Rent											72,921	130,214	181,869
Operating Segments | Company-owned | Franchisor
Operating expenses:
Rent											0
Corporate
Revenues:
Franchise rental income											0
Total revenue											0	0	0
Operating expenses:
Site operating expenses											0	0	0
General and administrative											72,590	86,897	81,002
Depreciation and amortization											6,917	8,823	9,332
Long-lived asset impairment											0
TBG restructuring											0	0
Goodwill impairment											0
Total operating expenses											82,096	96,582	91,292
Operating income (loss)											(82,096)	(96,582)	(91,292)
Other (expense) income:
Interest expense											(7,522)	(4,795)	(10,492)
Gain from sale of salon assets to franchisees, net											(27,306)	2,918	241
Interest income and other, net											3,353	1,729	5,199
Income (loss) from continuing operations before income taxes											(113,571)	(96,730)	(96,344)
Corporate | Non Franchise Lease
Operating expenses:
Rent											2,589	862	958
Corporate | Franchisor
Operating expenses:
Rent											0
Service
Revenues:
Revenues											331,538	749,660	899,345
Operating expenses:
Cost of service and products sold											222,279	452,827	530,582
Service | Operating Segments | Franchise
Revenues:
Revenues											0	0	0
Operating expenses:
Cost of service and products sold											0	0	0
Service | Operating Segments | Company-owned
Revenues:
Revenues											331,538	749,660	899,345
Operating expenses:
Cost of service and products sold											222,279	452,827	530,582
Service | Corporate
Revenues:
Revenues											0	0	0
Operating expenses:
Cost of service and products sold											0	0	0
Product
Revenues:
Revenues											137,586	225,618	258,740
Operating expenses:
Cost of service and products sold											84,698	128,816	140,623
Product | Operating Segments | Franchise
Revenues:
Revenues											52,421	59,905	53,703
Operating expenses:
Cost of service and products sold											40,032	47,219	42,128
Product | Operating Segments | Company-owned
Revenues:
Revenues											85,165	165,713	205,037
Operating expenses:
Cost of service and products sold											44,666	81,597	98,495
Product | Corporate
Revenues:
Revenues											0	0	0
Operating expenses:
Cost of service and products sold											0	0	0
Royalties and fees
Revenues:
Revenues											73,402	93,761	77,394
Royalties and fees | Operating Segments | Franchise
Revenues:
Revenues											73,402	93,761	77,394
Royalties and fees | Operating Segments | Company-owned
Revenues:
Revenues											0	0	0
Royalties and fees | Corporate
Revenues:
Revenues											$ 0	$ 0	$ 0