Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Changes in carrying amount
Balance, beginning of period			$ 1,251,277,000
Additions			0
Impairments	$ 0	$ 0	0	$ 0
Currency translation adjustments			(13,295,000)
Adjustments to prior acquisitions			0
Balance, end of period	1,237,982,000		1,237,982,000
U.S. Higher Education
Changes in carrying amount
Balance, beginning of period			632,075,000
Additions			0
Impairments			0
Currency translation adjustments			0
Adjustments to prior acquisitions			0
Balance, end of period	632,075,000		632,075,000
Australia / New Zealand
Changes in carrying amount
Balance, beginning of period			519,202,000
Additions			0
Impairments			0
Currency translation adjustments			(13,295,000)
Adjustments to prior acquisitions			0
Balance, end of period	505,907,000		505,907,000
Education Technology Services
Changes in carrying amount
Balance, beginning of period			100,000,000
Additions			0
Impairments			0
Currency translation adjustments			0
Adjustments to prior acquisitions			0
Balance, end of period	$ 100,000,000		$ 100,000,000