INTANGIBLE ASSETS (Summary of Indefinite-Lived Intangible Assets Balances by Reporting Segment) (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2017
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets balances	$ 313,128	$ 317,950	$ 341,762
Medical and Healthcare
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets balances	137,500	137,500	137,500
Professional Education [Member]
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets balances	69,053	69,126	67,812
Technology And Business
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets balances	$ 106,575	$ 111,324	$ 136,450