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BUSINESS COMBINATIONS (Estimated Fair Values of Assets Acquired and Liabilities Assumed) (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019 | May 31, 2019 | Sep. 30, 2018
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 686,992 | $ 687,256 |  | $ 627,239
OnCourse Learning [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Current Assets |  |  | $ 5,260 |
Property and Equipment |  |  | 1,197 |
Intangible Assets |  |  | 63,100 |
Goodwill |  |  | 59,519 |
Total Assets Acquired |  |  | 129,076 |
Liabilities Assumed |  |  | 9,445 |
Net Assets Acquired |  |  | $ 119,631 |

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