Acquisition Activity - Narrative (Details) - USD ($)				3 Months Ended			12 Months Ended
	Jan. 01, 2022	Sep. 01, 2021	Aug. 10, 2021	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill				$ 112,593,000			$ 112,593,000	$ 243,486,000	$ 26,563,000
Impairment of goodwill and intangible assets							131,400,000	0
Impairment							$ 15,500,000
Business Combination Bargain Purchase Gain Recognized Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag							Consolidated Statements of Income
Acquisition-related expenses							$ 1,900,000	7,600,000
Accreditation, licensing, and Title IV
Business Acquisition [Line Items]
Impairment							15,500,000
Rasmussen
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired		$ 325,500,000
Goodwill		217,430,000		86,000,000			86,000,000	$ 217,400,000
Goodwill, Period Increase (Decrease)						$ 500,000
Aggregate purchase price		$ 329,000,000
Rasmussen | Accreditation, licensing, and Title IV
Business Acquisition [Line Items]
Impairment				2,000,000	$ 9,000,000
RU Segment
Business Acquisition [Line Items]
Impairment of goodwill and intangible assets					131,400,000
RU Segment | Accreditation, licensing, and Title IV
Business Acquisition [Line Items]
Impairment				$ 2,000,000	13,500,000		15,500,000
Graduate School USA
Business Acquisition [Line Items]
Goodwill			$ 0
Aggregate purchase price	$ 1,000,000		1,000,000
Net working capital			1,900,000
Initial cash payment			500,000
Consideration retained by acquirer			500,000
Cash consideration for Rasmussen Acquisition			$ 500,000
Gain on acquisition	$ 3,828,000						$ 3,800,000
Reduction of gain on acquisition					$ 700,000