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Property, Plant, and Equipment (Narrative) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Sep. 30, 2018
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Drake Campus Fort Collins Colorado Member    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment held for sale $ 7,848 $ 8,306
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Duarte Facility [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment remaining 10,738  
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Duarte Facility [Member] | Employee Relocation [Member]    
Property, Plant and Equipment [Line Items]    
Assets planned to be disposed of as a result of relocation 377  
Second Campus Rockford Illinois [Member]    
Property, Plant and Equipment [Line Items]    
Construction in progress 23,801 32,248
Drake Campus Fort Collins Colorado Member    
Property, Plant and Equipment [Line Items]    
Construction in progress 5,624 3,967
Office furniture and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Gross assets acquired on capital leases 1,627 1,650
Accumulated depreciation on capital lease assets $ 1,441 $ 1,158