LEASES (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2022 USD ($) Squarefeet	Dec. 31, 2022 USD ($) Option Squarefeet Lease	Dec. 31, 2021 USD ($)	Aug. 31, 2022 USD ($)
Operating Leases [Abstract]
Approximate area of leased school space | Squarefeet	55,000	55,000
Undiscounted lease payments	$ 40,074	$ 40,074		$ 12,200
Operating lease term	12 years	12 years
Number of renewal options | Option		2
Renewal lease term	5 years	5 years
Capital expenditures	$ 400	$ 400
Rent paid	$ 300	300
Operating lease cost		18,900	$ 15,800
Variable lease cost			0
Operating cash flow information [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities		18,443	15,404
Non-cash activity [Abstract]
Lease liabilities arising from obtaining right-of-use assets		$ 13,820	$ 45,456
Number of new leases | Lease		4
Number of lease modifications | Lease		1
Weighted Average Remaining Lease Term and Discount Rate [Abstract]
Weighted-average remaining lease term	11 years 2 months 23 days	11 years 2 months 23 days	11 years 5 months 19 days
Weighted-average discount rate	7.12%	7.12%	7.67%
Maturities of Lease Liabilities [Abstract]
2023	$ 16,283	$ 16,283
2024	17,257	17,257
2025	15,319	15,319
2026	12,816	12,816
2027	9,532	9,532
Thereafter	69,499	69,499
Total lease payments	140,706	140,706
Less: imputed interest	(40,074)	(40,074)		$ (12,200)
Present value of lease liabilities	$ 100,632	$ 100,632
Minimum [Member]
Operating Leases [Abstract]
Remaining lease term	1 year	1 year
Maximum [Member]
Operating Leases [Abstract]
Remaining lease term	19 years	19 years
Variable lease cost		$ 100