Leases - Narrative (Details)	1 Months Ended		3 Months Ended		6 Months Ended
	May 31, 2024 campus	Feb. 29, 2024 USD ($)	Jun. 30, 2024 USD ($) campus	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) campus state	Jun. 30, 2023 USD ($)
Property, Plant and Equipment [Line Items]
Extension term (or more)					1 year
Variable lease payments					$ 0
Lease expense			$ 4,300,000	$ 5,100,000	9,500,000	$ 10,400,000
Cash paid for amounts included in operating lease liabilities			3,700,000	5,100,000	8,200,000	10,100,000
Loss on lease termination			779,000	0	3,715,000	0
Present value of operating lease liabilities			$ 573,000		$ 573,000
Interest rate			6.70%		6.70%
Finance lease expense			$ 100,000	$ 30,000	$ 100,000	$ 100,000
RU Segment
Property, Plant and Equipment [Line Items]
Number of campuses | campus					20
Number of states | state					6
Lease termination fee		$ 2,200,000	1,200,000
Loss on lease termination		$ 2,100,000	$ (400,000)		$ (1,200,000)
RU Segment | Minnesota
Property, Plant and Equipment [Line Items]
Number of consolidated campuses | campus			2
RU Segment | Wisconsin
Property, Plant and Equipment [Line Items]
Number of campuses to be closed | campus	2
Lease impairment			$ 400,000
HCN Segment
Property, Plant and Equipment [Line Items]
Number of campuses | campus					8
Number of states | state					3