OTHER FINANCIAL STATEMENT DATA - Schedule of Additional Information Concerning Selected Balance Sheet Accounts (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Jun. 30, 2018
Other current assets:
Prepaids	$ 5,165			$ 9,527
Restricted cash	9,213			22,238
Other	4,760			1,451
Other current assets	19,138			33,216
Property and equipment:
Property and equipment, gross	306,574			406,191
Less accumulated depreciation and amortization	(249,398)			(328,101)
Property and equipment, net	57,176			78,090	$ 99,288
Accrued expenses:
Payroll and payroll related costs	18,204			34,909
Insurance	10,278			12,935
Rent and related real estate costs	4,179			6,332
Other	16,164			26,575
Accrued expenses	48,825			80,751
Other non-current liabilities:
Deferred income taxes	13,916			17,924
Deferred rent				14,006
Insurance	20,301			23,565
Deferred benefits	11,106			12,457
Deferred franchise fees	45,478			39,367
Other	3,341			4,080
Other noncurrent liabilities	94,142	$ 92,819	$ 94,826	111,399
Buildings and improvements
Property and equipment:
Property and equipment, gross	36,379			29,165
Equipment, furniture and leasehold improvements
Property and equipment:
Property and equipment, gross	198,983			309,561
Internal use software
Property and equipment:
Property and equipment, gross	$ 71,212			$ 67,465