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Contingencies (Details)
$ in Thousands, £ in Millions
6 Months Ended
Mar. 11, 2015
claim
Aug. 17, 2011
Complaint
Dec. 31, 2018
USD ($)
Mar. 31, 2019
USD ($)
claim
program_review
Mar. 31, 2019
GBP (£)
claim
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 0
Deferred Charges and Other Assets | $     $ 117,830 $ 129,290  
Maximum [Member]          
Loss Contingencies [Line Items]          
Loss contingency, estimate of possible loss | $       $ 45,000  
Sale of KHE Campuses business [Member]          
Loss Contingencies [Line Items]          
Loss on Guarantor Lease Obligations | $     $ 17,500    
Education [Member] | Sale of KHE Campuses business [Member] | Higher Education [Member]          
Loss Contingencies [Line Items]          
Number of pending program reviews | program_review       2 2
Diaz Case [Member] | Education [Member]          
Loss Contingencies [Line Items]          
Separate complaints included In Diaz Case received rulings | Complaint   3      
Diaz Claims [Member] | Education [Member]          
Loss Contingencies [Line Items]          
Number of claims affirmed for dismissal by US Court of Appeal | claim 3        
Number of claims appealed | claim 4        
Her Majesty's Revenue and Customs (HMRC) [Member] | UK Pathways [Member] | Kaplan International [Member]          
Loss Contingencies [Line Items]          
Loss contingency, estimate of possible loss | £         £ 16.1
Deferred Charges and Other Assets | £         £ 16.1