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Acquisitions (Estimated Fair Values of Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Jun. 30, 2020 | May 31, 2019
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 686,374 | $ 686,214 |
OnCourse Learning [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Current assets |  |  | $ 5,260
Property and equipment |  |  | 1,197
Intangible assets |  |  | 63,100
Goodwill |  |  | 59,427
Total assets acquired |  |  | 128,984
Liabilities assumed |  |  | 9,445
Net assets acquired |  |  | $ 119,539

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