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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

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