SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Disaggregate revenue) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 316,594	$ 308,211	$ 600,784	$ 601,354
Higher Education [Member]
Disaggregation of Revenue [Line Items]
Revenues	270,881	273,342	515,895	521,857
Test Preparation [Member]
Disaggregation of Revenue [Line Items]
Revenues	26,381	20,961	49,486	46,084
Certifications [Member]
Disaggregation of Revenue [Line Items]
Revenues	7,284	6,968	15,498	15,828
Conferences/Seminars [Member]
Disaggregation of Revenue [Line Items]
Revenues	9,378	3,595	12,246	10,963
Memberships/Subscriptions [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,263	3,257	5,199	6,272
Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,407	88	2,460	350
Medical And Healthcare [Member]
Disaggregation of Revenue [Line Items]
Revenues	212,627	203,297	414,727	394,582
Medical And Healthcare [Member] | Higher Education [Member]
Disaggregation of Revenue [Line Items]
Revenues	211,487	203,297	412,660	394,582
Medical And Healthcare [Member] | Test Preparation [Member]
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Medical And Healthcare [Member] | Certifications [Member]
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Medical And Healthcare [Member] | Conferences/Seminars [Member]
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Medical And Healthcare [Member] | Memberships/Subscriptions [Member]
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Medical And Healthcare [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,140	0	2,067	0
Professional Education [Member]
Disaggregation of Revenue [Line Items]
Revenues	42,142	30,359	77,788	70,401
Professional Education [Member] | Higher Education [Member]
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Professional Education [Member] | Test Preparation [Member]
Disaggregation of Revenue [Line Items]
Revenues	23,950	16,451	44,452	36,988
Professional Education [Member] | Certifications [Member]
Disaggregation of Revenue [Line Items]
Revenues	7,284	6,968	15,498	15,828
Professional Education [Member] | Conferences/Seminars [Member]
Disaggregation of Revenue [Line Items]
Revenues	9,378	3,595	12,246	10,963
Professional Education [Member] | Memberships/Subscriptions [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,263	3,257	5,199	6,272
Professional Education [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	267	88	393	350
Technology And Business [Member]
Disaggregation of Revenue [Line Items]
Revenues	62,633	75,133	109,884	137,572
Technology And Business [Member] | Higher Education [Member]
Disaggregation of Revenue [Line Items]
Revenues	59,394	70,045	103,235	127,275
Technology And Business [Member] | Test Preparation [Member]
Disaggregation of Revenue [Line Items]
Revenues	3,239	5,088	6,649	10,297
Technology And Business [Member] | Certifications [Member]
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Technology And Business [Member] | Conferences/Seminars [Member]
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Technology And Business [Member] | Memberships/Subscriptions [Member]
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Technology And Business [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Home Office And Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	(808)	(578)	(1,615)	(1,201)
Home Office And Other [Member] | Higher Education [Member]
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Home Office And Other [Member] | Test Preparation [Member]
Disaggregation of Revenue [Line Items]
Revenues	(808)	(578)	(1,615)	(1,201)
Home Office And Other [Member] | Certifications [Member]
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Home Office And Other [Member] | Conferences/Seminars [Member]
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Home Office And Other [Member] | Memberships/Subscriptions [Member]
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Home Office And Other [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 0	$ 0	$ 0	$ 0