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Goodwill and Intangible Assets (Summary of Goodwill Balances by Reporting Segment) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Jun. 30, 2022
Sep. 30, 2021
Goodwill [Line Items]      
Goodwill $ 961,262 $ 961,262 $ 952,764
Chamberlain      
Goodwill [Line Items]      
Goodwill 4,716 4,716 4,716
Walden University      
Goodwill [Line Items]      
Goodwill 651,052 651,052 642,554
Medical and Veterinary      
Goodwill [Line Items]      
Goodwill $ 305,494 $ 305,494 $ 305,494