INTANGIBLE ASSETS (Schedule of Intangible Assets) (Detail) - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Intangible Assets [Line Items]
Amortizable Intangible Assets, Gross Carrying Amount	$ 68,622	$ 69,502	$ 74,424
Amortizable Intangible Assets, Accumulated Amortization	(27,898)	(24,521)	(23,339)
Indefinite-lived Intangible Assets, Gross Carrying Amount	317,691	317,950	335,715
Student Relationships [Member]
Intangible Assets [Line Items]
Amortizable Intangible Assets, Gross Carrying Amount	8,039	8,193	11,049
Amortizable Intangible Assets, Accumulated Amortization	$ (7,352)	(6,972)	(8,999)
Amortizable Intangible Assets, Weighted Average Amortization Period	5 years
Customer Relationships [Member]
Intangible Assets [Line Items]
Amortizable Intangible Assets, Gross Carrying Amount	$ 42,900	42,900	42,900
Amortizable Intangible Assets, Accumulated Amortization	$ (11,913)	(9,598)	(7,261)
Amortizable Intangible Assets, Weighted Average Amortization Period	10 years
Non-compete Agreements [Member]
Intangible Assets [Line Items]
Amortizable Intangible Assets, Gross Carrying Amount		700	700
Amortizable Intangible Assets, Accumulated Amortization		(700)	(682)
Curriculum/Software [Member]
Intangible Assets [Line Items]
Amortizable Intangible Assets, Gross Carrying Amount	$ 6,829	6,833	7,143
Amortizable Intangible Assets, Accumulated Amortization	$ (5,279)	(4,265)	(3,375)
Amortizable Intangible Assets, Weighted Average Amortization Period	4 years
Franchise Contracts [Member]
Intangible Assets [Line Items]
Amortizable Intangible Assets, Gross Carrying Amount	$ 9,044	9,064	10,597
Amortizable Intangible Assets, Accumulated Amortization	$ (1,968)	(1,720)	(1,717)
Amortizable Intangible Assets, Weighted Average Amortization Period	18 years
Proprietary Technology [Member]
Intangible Assets [Line Items]
Amortizable Intangible Assets, Gross Carrying Amount	$ 500	500	500
Amortizable Intangible Assets, Accumulated Amortization	$ (312)	(250)	(187)
Amortizable Intangible Assets, Weighted Average Amortization Period	4 years
Clinical Agreements [Member]
Intangible Assets [Line Items]
Amortizable Intangible Assets, Gross Carrying Amount	$ 335	336	392
Amortizable Intangible Assets, Accumulated Amortization	$ (123)	(112)	(118)
Amortizable Intangible Assets, Weighted Average Amortization Period	15 years
Trade Names [Member]
Intangible Assets [Line Items]
Amortizable Intangible Assets, Gross Carrying Amount	$ 975	976	1,143
Amortizable Intangible Assets, Accumulated Amortization	(951)	(904)	(1,000)
Indefinite-lived Intangible Assets, Gross Carrying Amount	$ 106,049	106,132	109,462
Amortizable Intangible Assets, Weighted Average Amortization Period	10 years
Ross Title IV Eligibility and Accreditations [Member]
Intangible Assets [Line Items]
Indefinite-lived Intangible Assets, Gross Carrying Amount	$ 14,100	14,100	14,100
Intellectual Property [Member]
Intangible Assets [Line Items]
Indefinite-lived Intangible Assets, Gross Carrying Amount	13,940	13,940	13,940
Chamberlain Title IV Eligibility and Accreditations [Member]
Intangible Assets [Line Items]
Indefinite-lived Intangible Assets, Gross Carrying Amount	1,200	1,200	1,200
AUC Title IV Eligibility and Accreditations [Member]
Intangible Assets [Line Items]
Indefinite-lived Intangible Assets, Gross Carrying Amount	100,000	100,000	100,000
Adtalem Brazil Accreditation [Member]
Intangible Assets [Line Items]
Indefinite-lived Intangible Assets, Gross Carrying Amount	$ 82,402	$ 82,578	$ 97,013