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INTANGIBLE ASSETS (Summary of Goodwill Balances by Reporting Segment) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2016
Goodwill [Line Items]      
Goodwill $ 860,865 $ 851,282 $ 854,188
Medical And Healthcare [Member]      
Goodwill [Line Items]      
Goodwill 310,210 310,210 310,210
Professional Education [Member]      
Goodwill [Line Items]      
Goodwill 306,776 306,653 306,642
Technology and Business [Member]      
Goodwill [Line Items]      
Goodwill 221,683 212,223 215,140
U.S. Traditional Postsecondary [Member]      
Goodwill [Line Items]      
Goodwill $ 22,196 $ 22,196 $ 22,196