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Contingencies (Details)
$ in Millions
6 Months Ended
Feb. 13, 2013
allegations
Aug. 17, 2011
Complaint
Jun. 30, 2017
USD ($)
claim
Case
program_review
Loss Contingencies [Line Items]      
Number of existing legal claims or proceedings that are likely to have a material effect on the Company's business | claim     0
Maximum [Member]      
Loss Contingencies [Line Items]      
Loss contingency, estimate of possible loss | $     $ 20
Education [Member] | Higher Education [Member]      
Loss Contingencies [Line Items]      
Number of pending program reviews | program_review     5
Education [Member] | Sale of KHE Campuses business [Member] | Higher Education [Member]      
Loss Contingencies [Line Items]      
Number of pending program reviews | program_review     4
Diaz Case [Member] | Education [Member]      
Loss Contingencies [Line Items]      
Separate complaints included In Diaz Case received rulings | Complaint   3  
Remaining employment claim in the Diaz complaint | Complaint   1  
Urquilla-Diaz And Jajdelski Case [Member] | Education [Member]      
Loss Contingencies [Line Items]      
Number of unsealed cases filed by former employees under the U.S. Federal False Claims Act | Case     2
Jajdelski Case [Member] | Education [Member]      
Loss Contingencies [Line Items]      
Number of allegations not dismissed | allegations 1