Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($)	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Changes in carrying amount
Balance, beginning of period	$ 1,206,883,000	$ 1,251,888,000
Additions	0	0
Impairments	0	0
Currency translation adjustments	2,827,000	(22,006,000)
Balance, end of period	1,209,710,000	1,229,882,000
U.S. Higher Education
Changes in carrying amount
Balance, beginning of period	632,075,000	632,075,000
Additions	0	0
Impairments	0	0
Currency translation adjustments	0	0
Balance, end of period	632,075,000	632,075,000
Australia / New Zealand
Changes in carrying amount
Balance, beginning of period	474,808,000	519,813,000
Additions	0	0
Impairments	0	0
Currency translation adjustments	2,827,000	(22,006,000)
Balance, end of period	477,635,000	497,807,000
Education Technology Services
Changes in carrying amount
Balance, beginning of period	100,000,000	100,000,000
Additions	0	0
Impairments	0	0
Currency translation adjustments	0	0
Balance, end of period	$ 100,000,000	$ 100,000,000