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Summary of Significant Accounting Policies Goodwill Text (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Goodwill [Line Items]      
Document Period End Date Sep. 30, 2018    
Document Fiscal Year Focus 2018    
Goodwill and intangible asset impairment expense $ 1,164 $ 0 $ 0
Goodwill 8,222 9,005 $ 9,005
Orlando Florida Campus      
Goodwill [Line Items]      
Goodwill   8,200  
BrokenMyth Studios, LLC [Member]      
Goodwill [Line Items]      
Goodwill and intangible asset impairment expense 800    
Impairment of Intangible Assets, Finite-lived $ 400    
Goodwill   $ 800