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Business Segments (Narrative) (Details)
$ in Thousands
9 Months Ended
Mar. 22, 2018
USD ($)
Sep. 30, 2025
USD ($)
segment
Dec. 31, 2024
USD ($)
Business Segments [Line Items]      
Number of reportable segments | segment   7  
Accounts Receivable, Current   $ 543,995 $ 514,426
Kaplan University Transaction [Member] | Purdue University Global [Member] | Education [Member] | Higher Education [Member]      
Business Segments [Line Items]      
Accounts Receivable   75,700  
Accounts Receivable, Noncurrent   15,100  
Accounts Receivable, Current   $ 4,700  
Advance Related To Kaplan University Transaction $ 20,000