Acquisitions (Estimated Fair Values of Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Aug. 12, 2021	Jun. 30, 2021	Mar. 31, 2021
Assets acquired:
Goodwill	$ 961,262		$ 310,210	$ 310,210
Walden University, LLC [Member]
Assets acquired:
Cash and cash equivalents		$ 65,010
Restricted cash		18,389
Accounts receivable		22,091
Prepaid expenses and other current assets		8,819
Property and equipment		25,882
Operating lease assets		6,096
Deferred income taxes		59
Intangible assets		833,351
Goodwill		651,052
Other assets, net		21,316
Total assets acquired		1,652,065
Liabilities assumed:
Accounts payable		31,971
Accrued payroll and benefits		25,639
Accrued liabilities		1,620
Deferred revenue		10,958
Current operating lease liabilities		1,983
Long-term operating lease liabilities		4,343
Other liabilities		4,098
Total liabilities assumed		80,612
Net assets acquired		$ 1,571,453