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INTANGIBLE ASSETS (Summary of Goodwill Balances by Reporting Segment) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Jun. 30, 2017
Mar. 31, 2017
Goodwill [Line Items]      
Goodwill $ 845,843 $ 829,086 $ 838,805
Medical And Healthcare [Member]      
Goodwill [Line Items]      
Goodwill 310,210 310,210 310,210
Professional Education [Member]      
Goodwill [Line Items]      
Goodwill 319,528 306,653 306,444
Technology and Business [Member]      
Goodwill [Line Items]      
Goodwill $ 216,105 $ 212,223 $ 222,151