Goodwill and Intangible Assets - Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Sep. 01, 2021	Aug. 10, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill	$ 112,593,000		$ 112,593,000	$ 243,486,000			$ 26,563,000
Amortization			15,800,000	5,100,000
Impairment			15,500,000
Impairment of goodwill and intangible assets			131,400,000	0
Accreditation, licensing, and Title IV
Business Acquisition [Line Items]
Indefinite-lived intangible assets acquired					$ 24,500,000
Impairment			15,500,000
Rasmussen
Business Acquisition [Line Items]
Goodwill	86,000,000		86,000,000	217,400,000	$ 217,430,000
Identified intangible assets with finite useful life	35,500,000		35,500,000
Rasmussen | Accreditation, licensing, and Title IV
Business Acquisition [Line Items]
Fair value of intangible assets	13,500,000	$ 11,000,000	13,500,000
Impairment	2,000,000	9,000,000
HCN
Business Acquisition [Line Items]
Goodwill	26,600,000		26,600,000				$ 38,600,000
Indefinite-lived intangible assets acquired	51,000,000		51,000,000	$ 3,700,000
Identified intangible assets with finite useful life	4,400,000		4,400,000
Fair value exceeding carrying value	$ 4,900,000		$ 4,900,000
Fair value exceeding carrying value (in percent)	13.00%		13.00%
Graduate School USA
Business Acquisition [Line Items]
Goodwill						$ 0
Identified intangible assets with finite useful life	$ 1,000,000		$ 1,000,000
RU Segment
Business Acquisition [Line Items]
Impairment of goodwill and intangible assets		131,400,000
Goodwill, impairment loss, tax effect		36,000,000
Fair value exceeding carrying value	$ 10,000,000		$ 10,000,000
Fair value exceeding carrying value (in percent)	5.00%		5.00%
RU Segment | Accreditation, licensing, and Title IV
Business Acquisition [Line Items]
Impairment	$ 2,000,000	$ 13,500,000	$ 15,500,000