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Acquisition Activity - Narrative (Details) - USD ($)
3 Months Ended
Jan. 01, 2022
Sep. 01, 2021
Aug. 10, 2021
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Business Acquisition [Line Items]            
Goodwill       $ 243,993,000   $ 243,486,000
Acquisition-related expenses       900,000 $ 600,000  
Rasmussen            
Business Acquisition [Line Items]            
Payments to acquire businesses, net of cash acquired   $ 325,500,000        
Goodwill   217,430,000   217,400,000    
Goodwill, period increase (decrease)       500,000    
Aggregate purchase price   $ 329,000,000        
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      
Non-taxable gain on acquisition       $ 4,500,000