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Acquisitions (Estimated Fair Values of Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Aug. 12, 2021 | Jun. 30, 2021 | Sep. 30, 2020
--- | --- | --- | --- | ---
Assets acquired: |  |  |  |
Goodwill | $ 1,328,928 |  | $ 686,374 | $ 686,480
Walden University, LLC [Member] |  |  |  |
Assets acquired: |  |  |  |
Cash and cash equivalents |  | $ 65,010 |  |
Restricted cash |  | 18,389 |  |
Accounts receivable, net |  | 22,091 |  |
Prepaid expenses and other current assets |  | 8,819 |  |
Property and equipment, net |  | 25,882 |  |
Operating lease assets |  | 6,096 |  |
Intangible assets |  | 833,351 |  |
Goodwill |  | 642,554 |  |
Other assets |  | 21,316 |  |
Total assets acquired |  | 1,643,508 |  |
Liabilities assumed: |  |  |  |
Accounts payable |  | 31,971 |  |
Accrued payroll and benefits |  | 24,376 |  |
Accrued liabilities |  | 591 |  |
Deferred revenue |  | 10,958 |  |
Current operating lease liabilities |  | 1,983 |  |
Long-term operating lease liabilities |  | 4,343 |  |
Other liabilities |  | 4,098 |  |
Total liabilities assumed |  | 78,320 |  |
Net assets acquired |  | $ 1,565,188 |  |

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